Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 100, Issue 21, Pages 12093-12098Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2134223100
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- NIGMS NIH HHS [GM 19261] Funding Source: Medline
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DNA polymerase eta (Poleta) has the unique ability to replicate through UV-light-induced cyclobutane pyrimidine dimers. Here we use pre-steady-state kinetic analyses to examine the mechanism of nucleotide incorporation opposite a cis-syn thymine-thymine (TT) dimer and an identical nondamaged sequence by yeast Poleta. Poleta displayed burst kinetics for nucleotide incorporation opposite both the damaged and nondamaged templates. Although a slight decrease occurred in the affinity (K-d) of nucleotide binding opposite the TT dimer relative to the nondamaged template, the rate (k(pol)) of nucleotide incorporation was the same whether the template was damaged or nondamaged. These results strongly support a mechanism in which the nucleotide is directly inserted opposite the TT dimer by using its intrinsic base-pairing ability without any hindrance from the distorted geometry of the lesion.
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