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. 2003 Jan 10;278(2):784-90.
doi: 10.1074/jbc.M207774200. Epub 2002 Oct 24.

Translesion synthesis past acrolein-derived DNA adduct, gamma -hydroxypropanodeoxyguanosine, by yeast and human DNA polymerase eta

Irina G Minko  1 , M Todd Washington, Manorama Kanuri, Louise Prakash, Satya Prakash, R Stephen Lloyd
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Free article

Translesion synthesis past acrolein-derived DNA adduct, gamma -hydroxypropanodeoxyguanosine, by yeast and human DNA polymerase eta

Irina G Minko et al. J Biol Chem. .
Free article

Abstract

gamma-Hydroxy-1,N(2)-propano-2'deoxyguanosine (gamma-HOPdG) is a major deoxyguanosine adduct derived from acrolein, a known mutagen. In vitro, this adduct has previously been shown to pose a severe block to translesion synthesis by a number of polymerases (pol). Here we show that both yeast and human pol eta can incorporate a C opposite gamma-HOPdG at approximately 190- and approximately 100-fold lower efficiency relative to the control deoxyguanosine and extend from a C paired with the adduct at approximately 8- and approximately 19-fold lower efficiency. Although DNA synthesis past gamma-HOPdG by yeast pol eta was relatively accurate, the human enzyme misincorporated nucleotides opposite the lesion with frequencies of approximately 10(-1) to 10(-2). Because gamma-HOPdG can adopt both ring closed and ring opened conformations, comparative replicative bypass studies were also performed with two model adducts, propanodeoxyguanosine and reduced gamma-HOPdG. For both yeast and human pol eta, the ring open reduced gamma-HOPdG adduct was less blocking than gamma-HOPdG, whereas the ring closed propanodeoxyguanosine adduct was a very strong block. Replication of DNAs containing gamma-HOPdG in wild type and xeroderma pigmentosum variant cells revealed a somewhat decreased mutation frequency in xeroderma pigmentosum variant cells. Collectively, the data suggest that pol eta might potentially contribute to both error-free and mutagenic bypass of gamma-HOPdG.

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