Journal: Scientific Reports
Article Title: A transcription and translation-coupled DNA replication system using rolling-circle replication
Figure Lengend Snippet: Transcription- and translation-coupled DNA (TTcDR) replication. To perform the TTcDR reaction, circular plasmid DNA encoding phi29 DNA polymerase was incubated with the translation system optimized in a previous study 11 , including dNTPs, yeast ppiase, T7 RNA polymerase, and [ 32 P]-dCTP, for 12 h at 30 °C. An aliquot of the mixture after incubation was used in 1% agarose gel electrophoresis and autoradiography. The arrowhead indicates the product of the TTcDR reaction. Lane 1: lambda-BstPI marker. Lane 2: TTcDR reaction without plasmid DNA. Lane 3: TTcDR reaction with plasmid DNA. Lane 4: DNA polymerization with a purified phi29 in phi29 standard buffer.
Article Snippet: Assay of the TTcDR reaction The optimized composition of the TTcDR system was as follows: template plasmid DNA (1 ng/μl), dNTPs (0.3 mM each, Takara), [32 -P] dCTP (3.3 μM, PerkinElmer), magnesium acetate (7.9 mM, Wako), potassium glutamate (70 mM, Wako), spermidine (0.375 mM, Nakarai), dithiothreitol (6 mM, Nakarai), ATP (0.375 mM, GE Healthcare), GTP (0.25 mM, GE Healthcare), CTP (0.125 mM, GE Healthcare), UTP (0.125 mM, GE Healthcare), creatine phosphate (25 mM, Nakarai), E. coli tRNA mixture (0.518 μg/μl, Roche), 10-formyl-5,6,7,8-tetrahydrofolic acid (10 ng/μl), Cys (0.3 mM, Wako), Tyr (0.3 mM, Wako), the other 18 amino acids except for Cys and Tyr (0.36 mM, Wako), 2-[4-(2-hydroxyethyl)-1-piperazinyl]ethanesulfonic acid (100 mM, pH 7.6, Sigma), ribosomes (1 μM), IF1 (25 μM), IF2 (1 μM), IF3 (4.9 μM), EF-G (1.1 μM), EF-Tu (80 μM), EF-Ts (3.3 μM), RF1 (0.05 μM), RF2 (0.05 μM), RF3 (0.17 μM), RRF (3.9 μM), AlaRS (730 nM), ArgRS (30 nM), AsnRS (420 nM), AspRS (120 nM), CysRS (20 nM), GlnRS (60 nM), GluRS (230 nM), GlyRS (90 nM), HisRS (90 nM), IleRS (370 nM), LeuRS (40 nM), LysRS (120 nM), MetRS (110 nM), PheRS (130 nM), ProRS (170 nM), SerRS (80 nM), ThrRS (80 nM), TrpRS (30 nM), TyrRS (150 nM), ValRS (20 nM), MTF (590 nM), creatine kinase (0.25 μM), myokinase (1.4 μM), nucleoside-diphosphate kinase (20 nM), pyrophosphatase (40 nM), yeast inorganic pyrophosphatase (0.2 mU/μl, New England BioLabs (NEB)), ribonuclease inhibitor (0.1 U/μl; Promega), and T7 RNA polymerase (0.42 U/μl; Takara).
Techniques: Plasmid Preparation, Incubation, Agarose Gel Electrophoresis, Autoradiography, Marker, Purification