Thymine glycols and urea residues in M13 DNA constitute replicative blocks<i>in vitro</i>
Nucleic Acids ResearchPublished 1 January 1985
Hiroshi Ide, Yoke W. Kow, Susan S. Wallace
Citations252
SJR quartileQ1
SJR score7.78
SNIP4.71
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TL;DR
With both thymine glycol- and urea-containing M13 DNA, DNA synthesis catalyzed by Escherichia coli DNA polymerase I Klenow fragment was decreased in proportion to the number of damages present in the template DNA.
Abstract
Thymine glycols were produced in M13 DNA in a concentration dependent manner by treating the DNA with osmium tetroxide (OsO4). For the formation of urea-containing M13 DNA, OsO4-oxidized DNA was hydrolyzed in alkali (pH 12) to convert the thymine glycols to urea residues. With both thymine glycol- and urea-containing M13 DNA, DNA synthesis catalyzed by Escherichia coli DNA polymerase I Klenow fragment was decreased in proportion to the number of damages present in the template DNA. Sequencing gel analysis of the products synthesized by E. coli DNA polymerase I and T4 DNA polymerase showed that DNA synthesis terminated opposite the putative thymine glycol site and at one nucleotide before the putative urea site. Substitution of manganese for magnesium in the reaction mix resulted in increased processivity of DNA synthesis so that a base was incorporated opposite urea. With thymine glycol-containing DNA, processivity in the presence of manganese was strongly dependent on the presence of a pyrimidine 5' to the thymine glycol in the template.
Keywords
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