Structural and functional analysis of Sulfolobus solfataricus Y-family DNA polymerase Dpo4-catalyzed bypass of the malondialdehyde-deoxyguanosine adduct.

Abstract:

Oxidative stress can induce the formation of reactive electrophiles, such as DNA peroxidation products, e.g., base propenals, and lipid peroxidation products, e.g., malondialdehyde. Base propenals and malondialdehyde react with DNA to form adducts, including 3-(2'-deoxy-beta-D-erythro-pentofuranosyl)pyrimido[1,2-alpha]purin-10(3H)- one (M1dG). When paired opposite cytosine in duplex DNA at physiological pH, M1dG undergoes ring opening to form N2-(3-oxo-1-propenyl)-dG (N2-OPdG). Previous work has shown that M1dG is mutagenic in bacteria and mammalian cells and that its mutagenicity in Escherichia coli is dependent on induction of the SOS response, indicating a role for translesion DNA polymerases in the bypass of M1dG. To probe the mechanism by which translesion polymerases bypass M1dG, kinetic and structural studies were conducted with a model Y-family DNA polymerase, Dpo4 from Sulfolobus solfataricus. The level of steady-state incorporation of dNTPs opposite M1dG was reduced 260-2900-fold and exhibited a preference for dATP incorporation. Liquid chromatography-tandem mass spectrometry analysis of the full-length extension products revealed a spectrum of products arising principally by incorporation of dC or dA opposite M1dG followed by partial or full-length extension. A greater proportion of -1 deletions were observed when dT was positioned 5' of M1dG. Two crystal structures were determined, including a "type II" frameshift deletion complex and another complex with Dpo4 bound to a dC.M1dG pair located in the postinsertion context. Importantly, M1dG was in the ring-closed state in both structures, and in the structure with dC opposite M1dG, the dC residue moved out of the Dpo4 active site, into the minor groove. The results are consistent with the reported mutagenicity of M1dG and illustrate how the lesion may affect replication events.

Polymerases:

Topics:

Structure and Structure/Function

Status:

new topics/pols set partial results complete validated

Results:

No results available for this paper.

Entry validated by:

Structures:

2V4Q 2V4R
Log in to edit reference All References

Using Polbase tables:

Sorting:

Tables may be sorted by clicking on any of the column titles. A second click reverses the sort order. <Ctrl> + click on the column titles to sort by more than one column (e.g. family then name).

Filtering:

It is also possible to filter the table by typing into the search box above the table. This will instantly hide lines from the table that do not contain your search text.