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DNA polymerase from mesophilic and thermophilic bacteria. III. Lack of fidelity in the replication of synthetic polydeoxyribonucleotides by DNA polymerase from Bacillus licheniformis and Bacillus stearothermophilus


DNA polymerase from mesophilic and thermophilic bacteria. III. Lack of fidelity in the replication of synthetic polydeoxyribonucleotides by DNA polymerase from Bacillus licheniformis and Bacillus stearothermophilus



Biochimica et Biophysica Acta 475(1): 32-41



ISSN/ISBN: 0006-3002

PMID: 849445

DOI: 10.1016/0005-2787(77)90336-7

1. DNA polymerase from the mesophile Bacillus licheniformis and the thermophile Bacillus stearothermophilus has been used to study the replication of poly(dA-dT)-poly(dA-dT) and poly(dC)-poly(dG) templates at 37, 45, and 55 degrees C. 2. Incorporation of non-complementary deoxyribonucleoside triphosphates (misincorporation) occurred with both enzymes and both templates. Non-specific incorporation (de novo polynucleotide synthesis, random attachment to existing strands, and tritium exchange of nucleotides) accounted for, at most, a small fraction of the total observed misincorporation. The error rates at 37 degrees C for the complete system were as follows:: B. licheniformis: dATP, 1/61; dCTP, 1/830; dGTP, 1/360; dTTP, 1/65; B. stearothermophilus: dATP, 1/68; dCTP, 1/1430; dGTP, 1/440; dTTP, 1/67. For both organisms, the error rate for dCTP and dGTP was independent of incubation temperature; the error rate for dATP and dTTP was 5-50-fold greater than that for dCTP or dGTP and increased significantly from 37 to 55 degrees C. 3. The ratio of dATP to dTTP incorporation with the poly(dA-dT)-poly-(dA-dT) template was independent of temperature and close to unity. The ratio of dCTP to dGTP incorporation with the poly(dC)-poly(dG) template decreased from approx. 0.2 to 0.05 for the mesophile and from approx. 0.06 to 0.03 for the thermophile as the temperature increased from 37 to 55 degrees C.

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