5 alpha escherichia coli cells  (New England Biolabs)


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    New England Biolabs 5 alpha escherichia coli cells
    5 Alpha Escherichia Coli Cells, supplied by New England Biolabs, used in various techniques. Bioz Stars score: 96/100, based on 1 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
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    New England Biolabs ampicillin resistant neb alpha competent e coli cells
    Structures of rBma-LEC-1/LEC-2 highest affinity glycans. The binding affinities of rBma-LEC-1 and rBma-LEC-2 were investigated with a glycan binding array. rBma-LEC-1 had high affinity for <t>alpha-galactose</t> on a biantennary N-glycan, for blood group B on a biantennary N-glycan, and for blood group B on multiple O-glycan and N-glycan motifs. rBma-LEC-2 had high affinity for blood group B, for blood group B on biantennary N-glycans, for alpha-galactose on biantennary N-glycans, and for various O-glycan and N-glycan motifs. This table shows the structures of the top five highest binding glycans. 1: Gala1-3Galb1-4GlcNAcb1-2Mana1-6(Gala1-3Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4GlcNAcb-GENR, 2: Gala1-3Galb1-4GlcNAcb1-2Mana1-6(Gala1-3Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4GlcNAc-KVANKT, 3: Gala1-3(Fuca1-2)Galb1-4GlcNAcb1-2Mana1-6(Gala1-3(Fuca1-2)Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4(Fuca1-6)GlcNAcb-NST, 4: Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-2Mana1-6(Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4GlcNAcb-VANK, 5: Gala1-3(Fuca1-2)Galb1-4GlcNAc-CH2CH2NH2, 6: Gala1-3(Fuca1-2)Galb1-3GlcNAcb-CH2CH2NH2.
    Ampicillin Resistant Neb Alpha Competent E Coli Cells, supplied by New England Biolabs, used in various techniques. Bioz Stars score: 98/100, based on 5 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
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    Average 98 stars, based on 5 article reviews
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    Structures of rBma-LEC-1/LEC-2 highest affinity glycans. The binding affinities of rBma-LEC-1 and rBma-LEC-2 were investigated with a glycan binding array. rBma-LEC-1 had high affinity for alpha-galactose on a biantennary N-glycan, for blood group B on a biantennary N-glycan, and for blood group B on multiple O-glycan and N-glycan motifs. rBma-LEC-2 had high affinity for blood group B, for blood group B on biantennary N-glycans, for alpha-galactose on biantennary N-glycans, and for various O-glycan and N-glycan motifs. This table shows the structures of the top five highest binding glycans. 1: Gala1-3Galb1-4GlcNAcb1-2Mana1-6(Gala1-3Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4GlcNAcb-GENR, 2: Gala1-3Galb1-4GlcNAcb1-2Mana1-6(Gala1-3Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4GlcNAc-KVANKT, 3: Gala1-3(Fuca1-2)Galb1-4GlcNAcb1-2Mana1-6(Gala1-3(Fuca1-2)Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4(Fuca1-6)GlcNAcb-NST, 4: Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-2Mana1-6(Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4GlcNAcb-VANK, 5: Gala1-3(Fuca1-2)Galb1-4GlcNAc-CH2CH2NH2, 6: Gala1-3(Fuca1-2)Galb1-3GlcNAcb-CH2CH2NH2.

    Journal: bioRxiv

    Article Title: Secreted filarial nematode galectins modulate host immune cells

    doi: 10.1101/2022.05.23.493127

    Figure Lengend Snippet: Structures of rBma-LEC-1/LEC-2 highest affinity glycans. The binding affinities of rBma-LEC-1 and rBma-LEC-2 were investigated with a glycan binding array. rBma-LEC-1 had high affinity for alpha-galactose on a biantennary N-glycan, for blood group B on a biantennary N-glycan, and for blood group B on multiple O-glycan and N-glycan motifs. rBma-LEC-2 had high affinity for blood group B, for blood group B on biantennary N-glycans, for alpha-galactose on biantennary N-glycans, and for various O-glycan and N-glycan motifs. This table shows the structures of the top five highest binding glycans. 1: Gala1-3Galb1-4GlcNAcb1-2Mana1-6(Gala1-3Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4GlcNAcb-GENR, 2: Gala1-3Galb1-4GlcNAcb1-2Mana1-6(Gala1-3Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4GlcNAc-KVANKT, 3: Gala1-3(Fuca1-2)Galb1-4GlcNAcb1-2Mana1-6(Gala1-3(Fuca1-2)Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4(Fuca1-6)GlcNAcb-NST, 4: Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-2Mana1-6(Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-3Galb1-4GlcNAcb1-2Mana1-3)Manb1-4GlcNAcb1-4GlcNAcb-VANK, 5: Gala1-3(Fuca1-2)Galb1-4GlcNAc-CH2CH2NH2, 6: Gala1-3(Fuca1-2)Galb1-3GlcNAcb-CH2CH2NH2.

    Article Snippet: Bma-LEC-1 and -2 PCR products were digested and ligated into pOET1C 6xHis Transfer plasmid using T4 DNA ligase (Thermo Fisher Scientific), transformed into ampicillin resistant NEB alpha competent E. coli cells (New England Biolabs, Ipswich, MA), inoculated into LB + Ampicillin media (10g/L Tryptone, 5g/L Yeast Extract, 10g/L NaCl, 100 µg/mL Ampicillin) (Sigma-Aldrich) and incubated at 200 rpm at 37°C overnight.

    Techniques: Binding Assay

    Three or four fragments can efficiently be assembled with PPY-cell extracts, while iVEC/“transformation-cloning” with three fragments is markedly less efficient. ( a ) The assembly of four fragments in a single reaction reduces the number of successful assemblies by a factor of two to ten as compared to the three-fragment-assembly. Cell-extracts were prepared from autoinduced PPY cells and the assemblies were purified prior transformation. ( b ) Assembly of three fragments by iVEC/“transformation-cloning” with NEB 5-alpha resulted in roughly 250 recombinant colonies/µg transformed DNA. A significant number of colonies harboring plasmids with defective inserts (grey bar) and PCR-template carry-over (dotted bar) were present on the plates.

    Journal: Scientific Reports

    Article Title: ZeBRα a universal, multi-fragment DNA-assembly-system with minimal hands-on time requirement

    doi: 10.1038/s41598-019-39768-0

    Figure Lengend Snippet: Three or four fragments can efficiently be assembled with PPY-cell extracts, while iVEC/“transformation-cloning” with three fragments is markedly less efficient. ( a ) The assembly of four fragments in a single reaction reduces the number of successful assemblies by a factor of two to ten as compared to the three-fragment-assembly. Cell-extracts were prepared from autoinduced PPY cells and the assemblies were purified prior transformation. ( b ) Assembly of three fragments by iVEC/“transformation-cloning” with NEB 5-alpha resulted in roughly 250 recombinant colonies/µg transformed DNA. A significant number of colonies harboring plasmids with defective inserts (grey bar) and PCR-template carry-over (dotted bar) were present on the plates.

    Article Snippet: Our OTG-extracts from NEB 5-alpha cells performed equivalently well or even slightly better with pT7-Hin dIII-ccdB than PPY-extracts.

    Techniques: Clone Assay, Purification, Transformation Assay, Recombinant, Polymerase Chain Reaction

    Strategy for SLiCE optimization and evaluation. ( a ) Flow chart of the optimization process for generating a recombinogenic E. coli lysate. The PPY strain is a DH10B-derivative used to prepare the recombinogenic cell lysate and expresses the coding sequences for Redαβγ. The extracts, derived from arabinose autoinduced PPY-cells, were compared to extracts made from non-induced PPY-cells. ( b ) Structure of the examined non-ionic detergents used to prepare the recombinogenic PPY-extracts, CHAPS, Sulfo-Betain (SB-12), n-Octyl-β-D-thioglucopyranosid (OTG), n-Octyl-β-D-glucopyranosid (OG) Dodecyl-β-D-maltosid (DDM). ( c ) PPY-extracts were tested for their recombination capacity by assembling three DNA fragments with overlapping ends, to generate a recombinant plasmid constitutively expressing a blue chromoprotein. To examine the effects detergents had on the transformation, samples were split after the assembly reaction. One part was transformed into NEB 5-alpha unpurified; the other fraction was purified by silica-column chromatography prior to transformation.

    Journal: Scientific Reports

    Article Title: ZeBRα a universal, multi-fragment DNA-assembly-system with minimal hands-on time requirement

    doi: 10.1038/s41598-019-39768-0

    Figure Lengend Snippet: Strategy for SLiCE optimization and evaluation. ( a ) Flow chart of the optimization process for generating a recombinogenic E. coli lysate. The PPY strain is a DH10B-derivative used to prepare the recombinogenic cell lysate and expresses the coding sequences for Redαβγ. The extracts, derived from arabinose autoinduced PPY-cells, were compared to extracts made from non-induced PPY-cells. ( b ) Structure of the examined non-ionic detergents used to prepare the recombinogenic PPY-extracts, CHAPS, Sulfo-Betain (SB-12), n-Octyl-β-D-thioglucopyranosid (OTG), n-Octyl-β-D-glucopyranosid (OG) Dodecyl-β-D-maltosid (DDM). ( c ) PPY-extracts were tested for their recombination capacity by assembling three DNA fragments with overlapping ends, to generate a recombinant plasmid constitutively expressing a blue chromoprotein. To examine the effects detergents had on the transformation, samples were split after the assembly reaction. One part was transformed into NEB 5-alpha unpurified; the other fraction was purified by silica-column chromatography prior to transformation.

    Article Snippet: Our OTG-extracts from NEB 5-alpha cells performed equivalently well or even slightly better with pT7-Hin dIII-ccdB than PPY-extracts.

    Techniques: Flow Cytometry, Derivative Assay, Recombinant, Plasmid Preparation, Expressing, Transformation Assay, Purification, Column Chromatography

    Comparison of the influence of detergent, autoinduction, post-assembly purification and competency of used bacteria on DNA assembling efficiency. ( a ) In four of the five PPY lysis conditions induction of Redα had moderate effects. Five different detergents were tested on PPY-cells grown with either lactose (Redα un-induced) or arabinose (Redα induced). All assemblies were column-purified before transformation into NEB 5-alpha. Bars indicate standard error of three independent replicates of an assembly reaction in all following graphs. PPY recombinogenic capacity was assessed in three-fragment assemblies. ( b ) Column-purification of the three-fragment-assembly reactions led to markedly increased number of recombinant colonies for all tested detergents. In the case of CHAPS and SB-12, unpurified samples resulted in no colonies. The OTG derived PPY-extract resulted in the highest number of recombinant colonies without purification. All assemblies were arabinose-induced. ( c ) Chemical competency has profound influence on recombination efficiency. OTG prepared PPY-lysate was used in a three-fragment-assembly and transformed into commercial NEB 5-alpha competent E. coli (1 × 10 9 cfu/µg pUC DNA) or the same strain prepared by the Inoue-method 21 (2.3 × 10 6 cfu/µg DNA). ( d ) For convenient readout of the potency of the PPY-extracts PCR-fragments used for the three- and four-way assembly reactions consisted of a blue chromoprotein coding ORF, a kanamycin resistance gene an origin-of-replication (on one fragment for the three-fragment assembly) and a bacterial basal-promoter-fragment. Only successful recombinants could produce blue colonies on kanamycin plates. The PCR-fragments to be assembled had overlapping bases that summed up to about 15 bp overlapping ends.

    Journal: Scientific Reports

    Article Title: ZeBRα a universal, multi-fragment DNA-assembly-system with minimal hands-on time requirement

    doi: 10.1038/s41598-019-39768-0

    Figure Lengend Snippet: Comparison of the influence of detergent, autoinduction, post-assembly purification and competency of used bacteria on DNA assembling efficiency. ( a ) In four of the five PPY lysis conditions induction of Redα had moderate effects. Five different detergents were tested on PPY-cells grown with either lactose (Redα un-induced) or arabinose (Redα induced). All assemblies were column-purified before transformation into NEB 5-alpha. Bars indicate standard error of three independent replicates of an assembly reaction in all following graphs. PPY recombinogenic capacity was assessed in three-fragment assemblies. ( b ) Column-purification of the three-fragment-assembly reactions led to markedly increased number of recombinant colonies for all tested detergents. In the case of CHAPS and SB-12, unpurified samples resulted in no colonies. The OTG derived PPY-extract resulted in the highest number of recombinant colonies without purification. All assemblies were arabinose-induced. ( c ) Chemical competency has profound influence on recombination efficiency. OTG prepared PPY-lysate was used in a three-fragment-assembly and transformed into commercial NEB 5-alpha competent E. coli (1 × 10 9 cfu/µg pUC DNA) or the same strain prepared by the Inoue-method 21 (2.3 × 10 6 cfu/µg DNA). ( d ) For convenient readout of the potency of the PPY-extracts PCR-fragments used for the three- and four-way assembly reactions consisted of a blue chromoprotein coding ORF, a kanamycin resistance gene an origin-of-replication (on one fragment for the three-fragment assembly) and a bacterial basal-promoter-fragment. Only successful recombinants could produce blue colonies on kanamycin plates. The PCR-fragments to be assembled had overlapping bases that summed up to about 15 bp overlapping ends.

    Article Snippet: Our OTG-extracts from NEB 5-alpha cells performed equivalently well or even slightly better with pT7-Hin dIII-ccdB than PPY-extracts.

    Techniques: Purification, Lysis, Transformation Assay, Recombinant, Derivative Assay, Polymerase Chain Reaction

    The recombinogenic capacity of OTG extracts from autoinduced PPY and NEB 5-alpha extracts are equivalent or better than PPY-extracts generated by the original protocol. ( a ) Plasmid map of pT7- Hin dIII- ccdB used to assess three-fragment ZeBRα assemblies. Two Hin dIII and two Bsa I sites flank the toxic-placeholder- ccdB , allowing linearization and removal of ccdB . Unique sites are available on either side of ccdB . Chloramphenicol-acetyl-transferase coding gene ( CmR ), is part of the placeholder cassette and prevents ccdB -loss during plasmid propagation. The hatched region encompasses the fragment removed during cloning. ( b ) Map of the vector pT7-GFP antisense resulting from the three-fragment test-assembly of the pT7- Hin dIII- ccdB as recipient for a GFP-ORF and a bacterial promoter containing PCR-fragment, to evaluate the efficacy of the ZeBRα-procedure. Criss-cross lines mark the fusion-sites of the assembled fragments. ( c ) Comparison of the recombination capacity of extracts prepared with OTG or CelLyticB TM from manually induced and autoinduced (denoted as “auto” in the column) PPY-cells and NEB 5-alpha. The iVEC/“transformation-cloning” of the respective fragments is shown as last column. ( d ) Green fluorescent NEB 5-alpha colonies harboring the constitutively GFP-expressing vector pT7-GFP antisense.

    Journal: Scientific Reports

    Article Title: ZeBRα a universal, multi-fragment DNA-assembly-system with minimal hands-on time requirement

    doi: 10.1038/s41598-019-39768-0

    Figure Lengend Snippet: The recombinogenic capacity of OTG extracts from autoinduced PPY and NEB 5-alpha extracts are equivalent or better than PPY-extracts generated by the original protocol. ( a ) Plasmid map of pT7- Hin dIII- ccdB used to assess three-fragment ZeBRα assemblies. Two Hin dIII and two Bsa I sites flank the toxic-placeholder- ccdB , allowing linearization and removal of ccdB . Unique sites are available on either side of ccdB . Chloramphenicol-acetyl-transferase coding gene ( CmR ), is part of the placeholder cassette and prevents ccdB -loss during plasmid propagation. The hatched region encompasses the fragment removed during cloning. ( b ) Map of the vector pT7-GFP antisense resulting from the three-fragment test-assembly of the pT7- Hin dIII- ccdB as recipient for a GFP-ORF and a bacterial promoter containing PCR-fragment, to evaluate the efficacy of the ZeBRα-procedure. Criss-cross lines mark the fusion-sites of the assembled fragments. ( c ) Comparison of the recombination capacity of extracts prepared with OTG or CelLyticB TM from manually induced and autoinduced (denoted as “auto” in the column) PPY-cells and NEB 5-alpha. The iVEC/“transformation-cloning” of the respective fragments is shown as last column. ( d ) Green fluorescent NEB 5-alpha colonies harboring the constitutively GFP-expressing vector pT7-GFP antisense.

    Article Snippet: Our OTG-extracts from NEB 5-alpha cells performed equivalently well or even slightly better with pT7-Hin dIII-ccdB than PPY-extracts.

    Techniques: Generated, Plasmid Preparation, Chloramphenicol Acetyltransferase Assay, Clone Assay, Polymerase Chain Reaction, Expressing

    Rendering the CcdB in the placeholder non-toxic increases the number of GFP – background colonies markedly, showing that ccdB is an essential element if working with non-gel purified vector. ( a ) The pT7- Hin dIII-dead- ccdB differs by a four base-pair deletion in the ccdB -coding sequence from it’s predecessor pT7- Hin dIII- ccdB . The dotted lines encompass the region removed during cloning. ( b ) Sequence alignment of the region encompassing the small deletion in the ccdB -ORF, in pT7- Hin dIII-dead- ccdB compared to the region in pT7- Hin dIII- ccdB and the resulting frameshift rendering the ΔCcdB non-toxic for E. coli NEB 5-alpha. The numbers denote bases in the vector. ( c ) The three-fragment assembly as shown in Fig. 6c uses the pT7-HindIII-dead- ccdB vector and OTG-derived PPY-extract to assemble pT7-GFP antisense analogous to the assemblies shown in Fig. 5 . The percentage of GFP + colonies drops from nearly 100% for pT7- Hin dIII- ccdB to 57% for pT7- Hin dIII-dead- ccdB . ( d ) Image of the mixture of GFP + and GFP − resulting from the assembly (100 µl outgrowth medium spread). The red arrow points at a cluster of GFP − colonies representing un-digested vector that would have to be screened for in a non-model assembly.

    Journal: Scientific Reports

    Article Title: ZeBRα a universal, multi-fragment DNA-assembly-system with minimal hands-on time requirement

    doi: 10.1038/s41598-019-39768-0

    Figure Lengend Snippet: Rendering the CcdB in the placeholder non-toxic increases the number of GFP – background colonies markedly, showing that ccdB is an essential element if working with non-gel purified vector. ( a ) The pT7- Hin dIII-dead- ccdB differs by a four base-pair deletion in the ccdB -coding sequence from it’s predecessor pT7- Hin dIII- ccdB . The dotted lines encompass the region removed during cloning. ( b ) Sequence alignment of the region encompassing the small deletion in the ccdB -ORF, in pT7- Hin dIII-dead- ccdB compared to the region in pT7- Hin dIII- ccdB and the resulting frameshift rendering the ΔCcdB non-toxic for E. coli NEB 5-alpha. The numbers denote bases in the vector. ( c ) The three-fragment assembly as shown in Fig. 6c uses the pT7-HindIII-dead- ccdB vector and OTG-derived PPY-extract to assemble pT7-GFP antisense analogous to the assemblies shown in Fig. 5 . The percentage of GFP + colonies drops from nearly 100% for pT7- Hin dIII- ccdB to 57% for pT7- Hin dIII-dead- ccdB . ( d ) Image of the mixture of GFP + and GFP − resulting from the assembly (100 µl outgrowth medium spread). The red arrow points at a cluster of GFP − colonies representing un-digested vector that would have to be screened for in a non-model assembly.

    Article Snippet: Our OTG-extracts from NEB 5-alpha cells performed equivalently well or even slightly better with pT7-Hin dIII-ccdB than PPY-extracts.

    Techniques: Purification, Plasmid Preparation, Sequencing, Clone Assay, Derivative Assay

    Plasmid DNA yield. E . coli DH5α and JM109 were transformed with high-copy number pUC19-Bla, pUC19-FabV, pUC19-FabI, and medium-copy number pSA-Hp24-Bla, pSA-Hp24-FabV, pBR322-FabI plasmids and selected on LB agar plates containing 1μM Triclosan (for FabV/FabI plasmids) and or 100μg mL -1 ampicillin (for Bla plasmids). Seed cultures were used to inoculated 5mL LB broth in 50mL flasks and cultured for another 18 hours at 37 or 30°C while shaking at 250rpm. Cell density was then measured by absorbing the diluted samples at 600nm and normalized to 2 OD600. One mL of the normalized culture was then used to extract the plasmid following supplied protocol. The quantity of the extracted plasmid DNA was measured by fluorometry using Qubit Fluorometer and Qubit dsDNA BR Assay Kit (Invitrogen, life technology). Fig 4A shows plasmid DNA yield when bacteria were grown at 37°C, whereas Fig 4B shows the plasmid DNA yield from cultures incubated at 30°C. Error bars show standard deviations calculated from at-least six (6) independent experiments performed in triplicate.

    Journal: PLoS ONE

    Article Title: FabV/Triclosan Is an Antibiotic-Free and Cost-Effective Selection System for Efficient Maintenance of High and Medium -Copy Number Plasmids in Escherichia coli

    doi: 10.1371/journal.pone.0129547

    Figure Lengend Snippet: Plasmid DNA yield. E . coli DH5α and JM109 were transformed with high-copy number pUC19-Bla, pUC19-FabV, pUC19-FabI, and medium-copy number pSA-Hp24-Bla, pSA-Hp24-FabV, pBR322-FabI plasmids and selected on LB agar plates containing 1μM Triclosan (for FabV/FabI plasmids) and or 100μg mL -1 ampicillin (for Bla plasmids). Seed cultures were used to inoculated 5mL LB broth in 50mL flasks and cultured for another 18 hours at 37 or 30°C while shaking at 250rpm. Cell density was then measured by absorbing the diluted samples at 600nm and normalized to 2 OD600. One mL of the normalized culture was then used to extract the plasmid following supplied protocol. The quantity of the extracted plasmid DNA was measured by fluorometry using Qubit Fluorometer and Qubit dsDNA BR Assay Kit (Invitrogen, life technology). Fig 4A shows plasmid DNA yield when bacteria were grown at 37°C, whereas Fig 4B shows the plasmid DNA yield from cultures incubated at 30°C. Error bars show standard deviations calculated from at-least six (6) independent experiments performed in triplicate.

    Article Snippet: Bacterial strains and culture conditions The E . coli strains DH5α (NEB #C2987) and JM109 (NEB #E4107) were used for cloning whereas BL21(DE3) (NEB # C2527) along with the other two E . coli strains was used for subsequent experiments.

    Techniques: Plasmid Preparation, Transformation Assay, Cell Culture, Incubation

    Morphology of transformed bacteria. E . coli DH5α and JM109 transformed with (A) high-copy number pUC19-Bla, pUC19-FabV, or pUC19-FabI plasmids or (B) medium–copy number pMXB-p24-Bla, pMXBp24-FabV, or pBR322-FabI plasmids were incubated at 30°C for 18 hours on plates with our without selection agent (Ampicillin or Triclosan) and photographed. No appreciable differences noted when the transformants were plated on Agar plates containing selection agent or not.

    Journal: PLoS ONE

    Article Title: FabV/Triclosan Is an Antibiotic-Free and Cost-Effective Selection System for Efficient Maintenance of High and Medium -Copy Number Plasmids in Escherichia coli

    doi: 10.1371/journal.pone.0129547

    Figure Lengend Snippet: Morphology of transformed bacteria. E . coli DH5α and JM109 transformed with (A) high-copy number pUC19-Bla, pUC19-FabV, or pUC19-FabI plasmids or (B) medium–copy number pMXB-p24-Bla, pMXBp24-FabV, or pBR322-FabI plasmids were incubated at 30°C for 18 hours on plates with our without selection agent (Ampicillin or Triclosan) and photographed. No appreciable differences noted when the transformants were plated on Agar plates containing selection agent or not.

    Article Snippet: Bacterial strains and culture conditions The E . coli strains DH5α (NEB #C2987) and JM109 (NEB #E4107) were used for cloning whereas BL21(DE3) (NEB # C2527) along with the other two E . coli strains was used for subsequent experiments.

    Techniques: Transformation Assay, Incubation, Selection

    Bacterial growth characteristics. E . coli DH5α, JM109, and BL21(DE3) were transformed with FabV (pUC19-FabV and pSA-HP24-FabV), FabI (pUC19-FabI, pBR322-FabI), or Bla (pUC19–Bla, pSA-HP24-Bla)-plasmids, and the transformants were selected on LB agar plates. Seed cultures were used to inoculate 25mL LB broth in 250mL baffled flasks and cultures grown at 37, 30, and 22°C for up to 12 hours while shaking at 250rpm. Samples were collected at one hour interval and growth was measured by absorbing the diluted samples at 600nm and graphs plotted. Error bars show standard deviations calculated from at-least six (6) independent experiments performed in triplicate.

    Journal: PLoS ONE

    Article Title: FabV/Triclosan Is an Antibiotic-Free and Cost-Effective Selection System for Efficient Maintenance of High and Medium -Copy Number Plasmids in Escherichia coli

    doi: 10.1371/journal.pone.0129547

    Figure Lengend Snippet: Bacterial growth characteristics. E . coli DH5α, JM109, and BL21(DE3) were transformed with FabV (pUC19-FabV and pSA-HP24-FabV), FabI (pUC19-FabI, pBR322-FabI), or Bla (pUC19–Bla, pSA-HP24-Bla)-plasmids, and the transformants were selected on LB agar plates. Seed cultures were used to inoculate 25mL LB broth in 250mL baffled flasks and cultures grown at 37, 30, and 22°C for up to 12 hours while shaking at 250rpm. Samples were collected at one hour interval and growth was measured by absorbing the diluted samples at 600nm and graphs plotted. Error bars show standard deviations calculated from at-least six (6) independent experiments performed in triplicate.

    Article Snippet: Bacterial strains and culture conditions The E . coli strains DH5α (NEB #C2987) and JM109 (NEB #E4107) were used for cloning whereas BL21(DE3) (NEB # C2527) along with the other two E . coli strains was used for subsequent experiments.

    Techniques: Transformation Assay

    Bacterial transformation efficiency. Chemically competent E . coli DH5α and JM109 cells were transformed with 100pg μL -1 of purified high-copy number pUC19-Bla, pUC19-FabV, pUC19-FabI, and medium-copy number pSA-Hp24-Bla, pSA-Hp24-FabV, pBR322-FabI plasmids and selected on LB agar plates containing 1μM Triclosan (for FabV/FabI plasmids) and or 100μg mL -1 ampicillin (for Bla plasmids) after 18 hours of incubation at 30°C and transformation efficiency calculated. Fig 5A and B show transformation efficiency of various plasmids in DH5α and JM109 respectively. Fig 5C and D show the effect of incubation time prior to plating the transformants on selection plates. Error bars show standard deviations calculated from at-least six (6) independent experiments performed in triplicate.

    Journal: PLoS ONE

    Article Title: FabV/Triclosan Is an Antibiotic-Free and Cost-Effective Selection System for Efficient Maintenance of High and Medium -Copy Number Plasmids in Escherichia coli

    doi: 10.1371/journal.pone.0129547

    Figure Lengend Snippet: Bacterial transformation efficiency. Chemically competent E . coli DH5α and JM109 cells were transformed with 100pg μL -1 of purified high-copy number pUC19-Bla, pUC19-FabV, pUC19-FabI, and medium-copy number pSA-Hp24-Bla, pSA-Hp24-FabV, pBR322-FabI plasmids and selected on LB agar plates containing 1μM Triclosan (for FabV/FabI plasmids) and or 100μg mL -1 ampicillin (for Bla plasmids) after 18 hours of incubation at 30°C and transformation efficiency calculated. Fig 5A and B show transformation efficiency of various plasmids in DH5α and JM109 respectively. Fig 5C and D show the effect of incubation time prior to plating the transformants on selection plates. Error bars show standard deviations calculated from at-least six (6) independent experiments performed in triplicate.

    Article Snippet: Bacterial strains and culture conditions The E . coli strains DH5α (NEB #C2987) and JM109 (NEB #E4107) were used for cloning whereas BL21(DE3) (NEB # C2527) along with the other two E . coli strains was used for subsequent experiments.

    Techniques: Electroporation Bacterial Transformation, Transformation Assay, Purification, Incubation, Selection

    Dual expression of RNase T and tRNA nucleotidyltransferase in E. coli Δ cca enforces selective growth phenotype. ( A ) Schematic presentation of the established in vivo system based on the dual expression of RNase T (orange) and tRNA nucleotidyltransferase (blue) from a pETDuet vector construct. In E. coli , both activities compete in the turnover of tRNA 3′ ends. ( B ) in vivo complementation requires efficient A-adding activity. Streak outs display E. coli JM109(DE3) Δ cca (top) or wild type (bottom) transformed with the indicated pETDuet construct plated onto LB-amp. Eco CCA, E. coli CCA-adding enzyme; DxD, wild type enzyme with catalytically active carboxylates; AxA, inactive enzyme variant with catalytically active carboxylates replaced by alanine residues; DxA, inactive enzyme with catalytically active aspartate at position 23 replaced by alanine; Bha A, B. halodurans A-adding enzyme; Δ cca, cca gene disruption; wt, wild type. ( C ) Radiolabeled yeast tRNA Phe(GAA) (top) or tRNA Phe(GAA) -CC (bottom), respectively, was incubated in the presence of 20 % (v/v) crude extract from different E. coli JM109(DE3) samples containing the indicated recombinantly expressed enzymes. Reaction products were resolved on a 10 % denaturing PAGE. Δ cca , extract prepared from the strain carrying cca gene disruption; wt, extract from wild type strain; C, control incubation without extract, Eco CCA, extract from E. coli expressing recombinant CCA-adding enzyme; Bha A, E. coli extract expressing B. halodurans A-adding enzyme. ( D ) Utilization of dual expression as a selection system. A vector library with a semi-randomized GNN sequence at codon position 23 in the open reading frame for E. coli CCA-adding enzyme was generated. Introduction into E. coli JM109(DE3) Δ cca resulted in colonies carrying vectors with GAT codons.

    Journal: Nucleic Acids Research

    Article Title: Dual expression of CCA-adding enzyme and RNase T in Escherichia coli generates a distinct cca growth phenotype with diverse applications

    doi: 10.1093/nar/gkz133

    Figure Lengend Snippet: Dual expression of RNase T and tRNA nucleotidyltransferase in E. coli Δ cca enforces selective growth phenotype. ( A ) Schematic presentation of the established in vivo system based on the dual expression of RNase T (orange) and tRNA nucleotidyltransferase (blue) from a pETDuet vector construct. In E. coli , both activities compete in the turnover of tRNA 3′ ends. ( B ) in vivo complementation requires efficient A-adding activity. Streak outs display E. coli JM109(DE3) Δ cca (top) or wild type (bottom) transformed with the indicated pETDuet construct plated onto LB-amp. Eco CCA, E. coli CCA-adding enzyme; DxD, wild type enzyme with catalytically active carboxylates; AxA, inactive enzyme variant with catalytically active carboxylates replaced by alanine residues; DxA, inactive enzyme with catalytically active aspartate at position 23 replaced by alanine; Bha A, B. halodurans A-adding enzyme; Δ cca, cca gene disruption; wt, wild type. ( C ) Radiolabeled yeast tRNA Phe(GAA) (top) or tRNA Phe(GAA) -CC (bottom), respectively, was incubated in the presence of 20 % (v/v) crude extract from different E. coli JM109(DE3) samples containing the indicated recombinantly expressed enzymes. Reaction products were resolved on a 10 % denaturing PAGE. Δ cca , extract prepared from the strain carrying cca gene disruption; wt, extract from wild type strain; C, control incubation without extract, Eco CCA, extract from E. coli expressing recombinant CCA-adding enzyme; Bha A, E. coli extract expressing B. halodurans A-adding enzyme. ( D ) Utilization of dual expression as a selection system. A vector library with a semi-randomized GNN sequence at codon position 23 in the open reading frame for E. coli CCA-adding enzyme was generated. Introduction into E. coli JM109(DE3) Δ cca resulted in colonies carrying vectors with GAT codons.

    Article Snippet: Following DpnI digest, E. coli NEB 5-alpha cells (NEB) were transformed with the DNA sample.

    Techniques: Expressing, In Vivo, Plasmid Preparation, Construct, Activity Assay, Transformation Assay, Variant Assay, Incubation, Polyacrylamide Gel Electrophoresis, Recombinant, Selection, Sequencing, Generated

    Effect of recombinantly expressed RNase T on growth behavior of E. coli . Growth was assessed for E. coli BL21(DE3) wild type (orange) and Δ cca (gray) transformed with pET28a(+)_RNase T at basal (no IPTG) and induced (0.05 mM IPTG) RNase T expression. Growth curves are representative for experiments that were reproducible at least three times.

    Journal: Nucleic Acids Research

    Article Title: Dual expression of CCA-adding enzyme and RNase T in Escherichia coli generates a distinct cca growth phenotype with diverse applications

    doi: 10.1093/nar/gkz133

    Figure Lengend Snippet: Effect of recombinantly expressed RNase T on growth behavior of E. coli . Growth was assessed for E. coli BL21(DE3) wild type (orange) and Δ cca (gray) transformed with pET28a(+)_RNase T at basal (no IPTG) and induced (0.05 mM IPTG) RNase T expression. Growth curves are representative for experiments that were reproducible at least three times.

    Article Snippet: Following DpnI digest, E. coli NEB 5-alpha cells (NEB) were transformed with the DNA sample.

    Techniques: Transformation Assay, Expressing

    Growth defect depends on RNase T activity and CCA-adding enzyme fidelity. ( A ) RNase T expression level affects cell survival. Left: Streak outs of E. coli JM109(DE3) Δ cca transformed with pETDuet constructs containing the coding regions of indicated enzymes. All introduced variants from E. coli CCA-adding enzyme show growth at conditions of RNase T basal expression. Right: E. coli growth was examined on LB-amp in an IPTG gradient from 0 to 0.2 mM, resulting in a gradual increase of RNase T-mediated tRNA end hydrolysis. The difference in RNase T tolerance is indicated by ‘Δ’. Eco CCA, E. coli CCA-adding enzyme; DxD, wild type enzyme with catalytically active carboxylates; AxA, inactive enzyme form with catalytically active carboxylates replaced by alanine residues; EWEloop, chimeric E. coli CCA-adding enzyme with flexible loop region from the corresponding W. glossinidia enzyme; wt, wild type E. coli CCA-adding enzyme with catalytically active DxD motif. ( B ) The described backup mechanism for CCA-addition by an error-prone enzyme is not sufficient for cell survival. Left: Streak outs of E. coli JM109(DE3) Δ cca (top) or wild type (bottom) transformed with indicated constructs on LB-amp. JM109(DE3) Δ cca expressing a CCA-adding enzyme with altered amino acid template EDxxA ( Eco CCA R134A) does not survive in the presence of basally expressed RNase T. Right: Model for the interplay between an erroneous CCA-adding enzyme Eco CCA R134A and RNase T in quality control. The erroneous CCA-adding enzyme incorporates the terminal residue of the CCA-end at random, resulting in CCA, CCG, CCU and CCC ends. Due to the substrate preference of RNase T for purine ends, only those tRNAs are trimmed at their 3′ end, while tRNA-CCU and tRNA-CCC are not. The combination of RNase T activity and the erroneous nucleotide incorporation by Eco CCA R134A leads to an accumulation of non-functional tRNAs, resulting in a fatal situation for the cell.

    Journal: Nucleic Acids Research

    Article Title: Dual expression of CCA-adding enzyme and RNase T in Escherichia coli generates a distinct cca growth phenotype with diverse applications

    doi: 10.1093/nar/gkz133

    Figure Lengend Snippet: Growth defect depends on RNase T activity and CCA-adding enzyme fidelity. ( A ) RNase T expression level affects cell survival. Left: Streak outs of E. coli JM109(DE3) Δ cca transformed with pETDuet constructs containing the coding regions of indicated enzymes. All introduced variants from E. coli CCA-adding enzyme show growth at conditions of RNase T basal expression. Right: E. coli growth was examined on LB-amp in an IPTG gradient from 0 to 0.2 mM, resulting in a gradual increase of RNase T-mediated tRNA end hydrolysis. The difference in RNase T tolerance is indicated by ‘Δ’. Eco CCA, E. coli CCA-adding enzyme; DxD, wild type enzyme with catalytically active carboxylates; AxA, inactive enzyme form with catalytically active carboxylates replaced by alanine residues; EWEloop, chimeric E. coli CCA-adding enzyme with flexible loop region from the corresponding W. glossinidia enzyme; wt, wild type E. coli CCA-adding enzyme with catalytically active DxD motif. ( B ) The described backup mechanism for CCA-addition by an error-prone enzyme is not sufficient for cell survival. Left: Streak outs of E. coli JM109(DE3) Δ cca (top) or wild type (bottom) transformed with indicated constructs on LB-amp. JM109(DE3) Δ cca expressing a CCA-adding enzyme with altered amino acid template EDxxA ( Eco CCA R134A) does not survive in the presence of basally expressed RNase T. Right: Model for the interplay between an erroneous CCA-adding enzyme Eco CCA R134A and RNase T in quality control. The erroneous CCA-adding enzyme incorporates the terminal residue of the CCA-end at random, resulting in CCA, CCG, CCU and CCC ends. Due to the substrate preference of RNase T for purine ends, only those tRNAs are trimmed at their 3′ end, while tRNA-CCU and tRNA-CCC are not. The combination of RNase T activity and the erroneous nucleotide incorporation by Eco CCA R134A leads to an accumulation of non-functional tRNAs, resulting in a fatal situation for the cell.

    Article Snippet: Following DpnI digest, E. coli NEB 5-alpha cells (NEB) were transformed with the DNA sample.

    Techniques: Activity Assay, Expressing, Transformation Assay, Construct, Countercurrent Chromatography, Functional Assay

    The E. coli system allows for the in vivo complementation of tRNA nucleotidyltransferases from all domains of life. ( A ) Streak outs of E. coli JM109(DE3) Δ cca transformed with pETDuet constructs containing the coding regions of indicated enzymes. Both eukaryotic and archaeal enzymes can complement the lacking CCA-adding activity in the E. coli -based system. Eco CCA, E. coli CCA-adding enzyme; Hsa CCA, Homo sapiens CCA-adding enzyme; Mba CCA, Methanosarcina barkeri CCA-adding enzyme; DxD, catalytically active carboxylates; AxA, catalytically active carboxylates replaced by alanines. ( B ) Drop plate assay to compare the growth of JM109(DE3) Δ cca with pETDuet constructs containing coding regions of either wild type or L166S variant from human CCA-adding enzyme at indicated temperatures. Growth of cells with temperature-sensitive variant L166S is inhibited at increased temperatures. wt, wild type.

    Journal: Nucleic Acids Research

    Article Title: Dual expression of CCA-adding enzyme and RNase T in Escherichia coli generates a distinct cca growth phenotype with diverse applications

    doi: 10.1093/nar/gkz133

    Figure Lengend Snippet: The E. coli system allows for the in vivo complementation of tRNA nucleotidyltransferases from all domains of life. ( A ) Streak outs of E. coli JM109(DE3) Δ cca transformed with pETDuet constructs containing the coding regions of indicated enzymes. Both eukaryotic and archaeal enzymes can complement the lacking CCA-adding activity in the E. coli -based system. Eco CCA, E. coli CCA-adding enzyme; Hsa CCA, Homo sapiens CCA-adding enzyme; Mba CCA, Methanosarcina barkeri CCA-adding enzyme; DxD, catalytically active carboxylates; AxA, catalytically active carboxylates replaced by alanines. ( B ) Drop plate assay to compare the growth of JM109(DE3) Δ cca with pETDuet constructs containing coding regions of either wild type or L166S variant from human CCA-adding enzyme at indicated temperatures. Growth of cells with temperature-sensitive variant L166S is inhibited at increased temperatures. wt, wild type.

    Article Snippet: Following DpnI digest, E. coli NEB 5-alpha cells (NEB) were transformed with the DNA sample.

    Techniques: In Vivo, Transformation Assay, Construct, Activity Assay, Variant Assay