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2dpj
From Proteopedia
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structure of hPoli with DNA and dTTP
Overview
The 1,N6-ethenodeoxyadenosine (epsilon dA) lesion is promutagenic and has, been implicated in carcinogenesis. We show here that human Pol iota, a, Y-family DNA polymerase, can promote replication through this lesion by, proficiently incorporating a nucleotide opposite it. The structural basis, of this action is rotation of the epsilon dA adduct to the syn, conformation in the Pol iota active site and presentation of its, 'Hoogsteen edge' for hydrogen-bonding with incoming dTTP or dCTP. We also, show that Pol zeta carries out the subsequent extension reaction and that, efficiency of extension from epsilon dA x T is notably higher than from, epsilon dA x C. Together, our studies reveal for the first time how the, exocyclic epsilon dA adduct is accommodated in a DNA polymerase active, site, and they show that the combined action of Pol iota and Pol zeta, provides for efficient and error-free synthesis through this potentially, carcinogenic DNA lesion.
About this Structure
2DPJ is a Single protein structure of sequence from Homo sapiens with MG and TTP as ligands. Active as DNA-directed DNA polymerase, with EC number 2.7.7.7 Full crystallographic information is available from OCA.
Reference
Hoogsteen base pair formation promotes synthesis opposite the 1,N6-ethenodeoxyadenosine lesion by human DNA polymerase iota., Nair DT, Johnson RE, Prakash L, Prakash S, Aggarwal AK, Nat Struct Mol Biol. 2006 Jul;13(7):619-25. Epub 2006 Jul 2. PMID:16819516
Page seeded by OCA on Mon Nov 12 21:39:04 2007
