Nucleic Acids Research, 2001, Vol. 29, No. 13 2875-2883
© 2001 Oxford University Press
Translesion synthesis by yeast DNA polymerase
from templates containing lesions of ultraviolet radiation and acetylaminofluorene
In the yeast Saccharomyces cerevisiae, DNA polymerase
(Pol
) is required in a major lesion bypass pathway. To help understand the role of Pol
in lesion bypass, we have performed in vitro biochemical analyses of this polymerase in response to several DNA lesions. Purified yeast Pol
performed limited translesion synthesis opposite a template TT (6-4) photoproduct, incorporating A or T with similar efficiencies (and less frequently G) opposite the 3' T, and predominantly A opposite the 5' T. Purified yeast Pol
predominantly incorporated a G opposite an acetylaminofluorene (AAF)-adducted guanine. The lesion, however, significantly inhibited subsequent extension. Furthermore, yeast Pol
catalyzed extension DNA synthesis from primers annealed opposite the AAF-guanine and the 3' T of the TT (6-4) photoproduct with varying efficiencies. Extension synthesis was more efficient when A or C was opposite the AAF-guanine, and when G was opposite the 3' T of the TT (6-4) photoproduct. In contrast, the 3' T of a cissyn TT dimer completely blocked purified yeast Pol
, whereas the 5' T was readily bypassed. These results support the following dual-function model of Pol
. First, Pol
catalyzes nucleotide incorporation opposite AAF-guanine and TT (6-4) photoproduct with a limited efficiency. Secondly, more efficient bypass of these lesions may require nucleotide incorporation by other DNA polymerases followed by extension DNA synthesis by Pol
.
* To whom correspondence should be addressed. Tel: +1 859 323 5784; Fax: +1 859 323 1059; Email: zwang{at}pop.uky.edu
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