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5 protocols using dntp solutions

1

Recombinant Protein Expression in E. coli

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All chemicals used were purchased from Sigma Aldrich or Fisher Scientific unless noted otherwise. Endoproteinases Glu-C and Lys-C were purchased from Roche Applied Science. Oligonucleotide primers used for molecular cloning were purchased from Integrated DNA Technologies. The pBAD/HisA vector was purchased from Invitrogen. Electrocompetent E. coli DH5α cells, Phusion High-Fidelity DNA polymerase, Taq ligase, dNTP solutions, T4 DNA ligase and all restriction endonucleases were purchased from New England Biolabs. Gel extraction, plasmid miniprep, and PCR purification kits were purchased from QIAGEN. Protein Calibration Standard I and Peptide Calibration Standard II for MALDI-TOF MS were purchased from Bruker. E. coli DH5α was used as host for cloning and plasmid propagation, and E. coli BL21 (DE3) was used as a host for overexpression.
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2

Recombinant Protein Expression in E. coli

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All chemicals used were purchased from Sigma Aldrich or Fisher Scientific unless noted otherwise. Endoproteinases Glu-C and Lys-C were purchased from Roche Applied Science. Oligonucleotide primers used for molecular cloning were purchased from Integrated DNA Technologies. The pBAD/HisA vector was purchased from Invitrogen. Electrocompetent E. coli DH5α cells, Phusion High-Fidelity DNA polymerase, Taq ligase, dNTP solutions, T4 DNA ligase and all restriction endonucleases were purchased from New England Biolabs. Gel extraction, plasmid miniprep, and PCR purification kits were purchased from QIAGEN. Protein Calibration Standard I and Peptide Calibration Standard II for MALDI-TOF MS were purchased from Bruker. E. coli DH5α was used as host for cloning and plasmid propagation, and E. coli BL21 (DE3) was used as a host for overexpression.
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3

Eukaryotic Translesion Synthesis Enzymes

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Yeast pol ζ, human pol κ, and
Rev1 were obtained from Enzymax (Lexington, KY). The dNTP solutions
(100 mM) were from New England Biolabs (Ipswich, MA) or GE Healthcare
(Piscataway, NJ). [γ-32P]ATP was obtained from PerkinElmer
(Waltham, MA). dG-N2-IQ modified oligonucleotides
were synthesized according to a literature procedure.40 (link) Unmodified oligonucleotides were from Midland Certified
Reagents (Midland, TX).
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4

Deglycosylation and Purification of Lantipeptide

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All chemicals and enzymes used were purchased from Sigma-Aldrich or Fisher Scientific unless noted otherwise. Endoproteinase Glu-C was purchased from Worthington Biosciences. UDP-xylose was obtained from Complex Carbohydrate Research Center. Oligonucleotide primers used for molecular cloning were purchased from Integrated DNA Technologies. Phusion High-Fidelity DNA polymerase, Q5 DNA polymerase, Taq ligase, dNTP solutions, T4 DNA ligase, and all restriction endonucleases were purchased from New England BioLabs. Gel extraction, plasmid miniprep, and PCR purification kits were purchased from QIAGEN. Protein Calibration Standard I and Peptide Calibration Standard II for MALDI–TOF MS were purchased from Bruker. E. coli NEB Turbo was used as host for cloning and plasmid propagation, and E. coli BL21(DE3) SHuffle was used as a host for expression of deglycosublancin.19 (link) Nickel resin used for gravity-based purification of His-tagged peptides or proteins was purchased from Takara Biosciences. Gradient gels used for checking protein expression were purchased from Biorad Inc. Plasmids pHCMC04 and pJOE8999 for molecular cloning in B. subtilis Δspβ were purchased from the Bacillus Genetics Stock Center (BGSC). B. subtilis Δ6 and plasmids encoding fluorescent proteins in Bacillus were also purchased from BGSC. Cyanine-5-amine was purchased from Lumiprobe.
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5

Kinetics of T7 DNA Polymerase

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All dNTP solutions and BSA were purchased from New England Biolabs. All chemicals used in the reaction buffer were purchased from Fisher Scientific or Sigma-Aldrich. The exonuclease-deficient D5A E7A variant of T7 gene product 5 was used in all experiments and enzymatic synthesis reactions in this paper to prevent exonuclease degradation of the DNA. Wildtype and E514Cou T7 DNA polymerase as well as thioredoxin were expressed and purified as described (21 (link)). All reactions were carried out in T7 Reaction Buffer at 4 °C to better resolve the individual rate constants in the pathway. In some experiments the enzyme–DNA complex was preincubated without Mg2+ and Mg2+-dNTP was added to start the reaction. In other experiments, both reactant mixtures were preincubated in the presence of Mg2+ before mixing with dNTP to start the reaction. In both cases, the final total MgCl2 concentration after mixing was 12.5 mM and there was no observed difference in the kinetics between the two experimental protocols. All concentrations given are those after mixing.
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