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    New England Biolabs nt alwi
    Constructing ssRNA topological structures with the junction-based method. ( a ) Preparation of the ssRNA strand with uniform ends and proper end groups for the DNA-splinted RNA ligation. ( b ) Both the positive ( TK j ( + )) and negative ( TK j ( − )) RNA trefoil knots of the same sequence are constructed by configuring tensegrity triangles with different handedness. The same scaffolds (blue) are threaded by different staple sets (grey or purple) to form a 17-bp-edged right-handed tensegrity triangle for the positive trefoil knot, or a 14-bp-edged left-handed tensegrity triangle for the negative one, respectively. Each topology is designated by the Alexander–Briggs notation n i or , where n is the minimal number of nodes, C is the number of components (for links), and i distinguishes different topologies with the same n and C . ( c ) dPAGE analysis of TK j ( + ) (lanes 1 and 2), TK j ( − ) (lanes 3 and 4), and their circular ( C j , lanes 5 and 6) and linear ( L j , lanes 7 and 8) counterparts. Lanes 2, 4, 6 and 8 contain samples digested by RNase R. ( d ) The assembly complex for the hybrid BR contains tensegrity triangles of both handedness to generate three positive nodes plus three negative nodes. ( e ) Topological analyses of the hybrid BR. Lane 1, gel-purified BR; lanes 2–6, BR treated by RNase H, <t>Nt.AlwI</t> (for cleaving the red ring), <t>Nt.BspQI</t> (for cleaving the green ring), DNase I, and E. coli DNA Topo I; lanes 7 and 8, DNA and RNA references of the three individual components. During the purification of BR, the breaking down of the 95-nt circular RNA component is unavoidable, and a portion of BR falls apart as a result. The treatment of BR by RNase H, Nt.AlwI and Nt.BspQI is conducted in the presence of an assisting DNA strand complementary to the corresponding ssRNA or ssDNA ring. LX and CX represent X-nt linear and circular species, respectively. In all the gels, lane M contains the DNA size markers.
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    Constructing ssRNA topological structures with the junction-based method. ( a ) Preparation of the ssRNA strand with uniform ends and proper end groups for the DNA-splinted RNA ligation. ( b ) Both the positive ( TK j ( + )) and negative ( TK j ( − )) RNA trefoil knots of the same sequence are constructed by configuring tensegrity triangles with different handedness. The same scaffolds (blue) are threaded by different staple sets (grey or purple) to form a 17-bp-edged right-handed tensegrity triangle for the positive trefoil knot, or a 14-bp-edged left-handed tensegrity triangle for the negative one, respectively. Each topology is designated by the Alexander–Briggs notation n i or , where n is the minimal number of nodes, C is the number of components (for links), and i distinguishes different topologies with the same n and C . ( c ) dPAGE analysis of TK j ( + ) (lanes 1 and 2), TK j ( − ) (lanes 3 and 4), and their circular ( C j , lanes 5 and 6) and linear ( L j , lanes 7 and 8) counterparts. Lanes 2, 4, 6 and 8 contain samples digested by RNase R. ( d ) The assembly complex for the hybrid BR contains tensegrity triangles of both handedness to generate three positive nodes plus three negative nodes. ( e ) Topological analyses of the hybrid BR. Lane 1, gel-purified BR; lanes 2–6, BR treated by RNase H, Nt.AlwI (for cleaving the red ring), Nt.BspQI (for cleaving the green ring), DNase I, and E. coli DNA Topo I; lanes 7 and 8, DNA and RNA references of the three individual components. During the purification of BR, the breaking down of the 95-nt circular RNA component is unavoidable, and a portion of BR falls apart as a result. The treatment of BR by RNase H, Nt.AlwI and Nt.BspQI is conducted in the presence of an assisting DNA strand complementary to the corresponding ssRNA or ssDNA ring. LX and CX represent X-nt linear and circular species, respectively. In all the gels, lane M contains the DNA size markers.

    Journal: Nature Communications

    Article Title: Synthesizing topological structures containing RNA

    doi: 10.1038/ncomms14936

    Figure Lengend Snippet: Constructing ssRNA topological structures with the junction-based method. ( a ) Preparation of the ssRNA strand with uniform ends and proper end groups for the DNA-splinted RNA ligation. ( b ) Both the positive ( TK j ( + )) and negative ( TK j ( − )) RNA trefoil knots of the same sequence are constructed by configuring tensegrity triangles with different handedness. The same scaffolds (blue) are threaded by different staple sets (grey or purple) to form a 17-bp-edged right-handed tensegrity triangle for the positive trefoil knot, or a 14-bp-edged left-handed tensegrity triangle for the negative one, respectively. Each topology is designated by the Alexander–Briggs notation n i or , where n is the minimal number of nodes, C is the number of components (for links), and i distinguishes different topologies with the same n and C . ( c ) dPAGE analysis of TK j ( + ) (lanes 1 and 2), TK j ( − ) (lanes 3 and 4), and their circular ( C j , lanes 5 and 6) and linear ( L j , lanes 7 and 8) counterparts. Lanes 2, 4, 6 and 8 contain samples digested by RNase R. ( d ) The assembly complex for the hybrid BR contains tensegrity triangles of both handedness to generate three positive nodes plus three negative nodes. ( e ) Topological analyses of the hybrid BR. Lane 1, gel-purified BR; lanes 2–6, BR treated by RNase H, Nt.AlwI (for cleaving the red ring), Nt.BspQI (for cleaving the green ring), DNase I, and E. coli DNA Topo I; lanes 7 and 8, DNA and RNA references of the three individual components. During the purification of BR, the breaking down of the 95-nt circular RNA component is unavoidable, and a portion of BR falls apart as a result. The treatment of BR by RNase H, Nt.AlwI and Nt.BspQI is conducted in the presence of an assisting DNA strand complementary to the corresponding ssRNA or ssDNA ring. LX and CX represent X-nt linear and circular species, respectively. In all the gels, lane M contains the DNA size markers.

    Article Snippet: Digestion with various nucleases Various nucleases were used in this work, including Nt.AlwI (NEB), Nt.BspQI (NEB), RNase H (NEB), DNase I (NEB) and RNase R (Epicentre).

    Techniques: Ligation, Sequencing, Construct, Purification

    RecN binding to nicked DNA. Nt.AlwI-treated EcoRV-linear DNA (150 nM in nt) and RecN (10 nM) were incubated for 10 min at 37°C. Reaction was fixed with 0.1 glutaraldehyde and deposited on freshly cut mica. ( A ) AFM images of Nt.AlwI-treated DNA–RecN complexes analysed. ( B ) Geometrical analyses of Nt.AlwI-treated DNA–RecN complexes. The length from the end of the substrate to DNA-bound RecN was measured and shown as a histogram in 250 bp bin. A schematic map of plasmid DNA with the target localization for Nt.AlwI endonuclease and relevant high dA + dT regions ( P lac , pUC ori and f1 ori ) are shown at the same scale of the histogram.

    Journal: Nucleic Acids Research

    Article Title: Dynamic structures of Bacillus subtilis RecN-DNA complexes

    doi: 10.1093/nar/gkm759

    Figure Lengend Snippet: RecN binding to nicked DNA. Nt.AlwI-treated EcoRV-linear DNA (150 nM in nt) and RecN (10 nM) were incubated for 10 min at 37°C. Reaction was fixed with 0.1 glutaraldehyde and deposited on freshly cut mica. ( A ) AFM images of Nt.AlwI-treated DNA–RecN complexes analysed. ( B ) Geometrical analyses of Nt.AlwI-treated DNA–RecN complexes. The length from the end of the substrate to DNA-bound RecN was measured and shown as a histogram in 250 bp bin. A schematic map of plasmid DNA with the target localization for Nt.AlwI endonuclease and relevant high dA + dT regions ( P lac , pUC ori and f1 ori ) are shown at the same scale of the histogram.

    Article Snippet: EcoRV-cleaved pBluescript was exposed to Nt.AlwI endonuclease (NEB) to obtain blunt-ended DNA molecules with internal single-strand nicks.

    Techniques: Binding Assay, Incubation, Plasmid Preparation