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Effect of β,γ-CHF- and β,γ-CHCl-dGTP halogen atom stereochemistry on the transition state of DNA polymerase β.

Abstract：

:Recently, we synthesized the first individual β,γ-CHX-dGTP diastereomers [(R)- or (S)-CHX, where X is F or Cl] and determined their structures in ternary complexes with DNA polymerase β (pol β). We now report stereospecificity by pol β on the mixed β,γ-CHX diastereomer pairs using nuclear magnetic resonance and on the separate diastereomers using transient kinetics. For both the F and Cl diastereomers, the R isomer is favored over the S isomer for G·C correct incorporation, with stereospecificities [(k(pol)/K(d))(R)/(k(pol)/K(d))(S)] of 3.8 and 6.3, respectively, and also for G·T misincorporation, with stereospecificities of 11 and 7.8, respectively. Stereopreference for the (R)-CHF-dGTP diastereomer was abolished for k(pol) but not K(d) with mutant pol β (R183A). These compounds constitute a new class of stereochemical probes for active site interactions involving halogen atoms. As Arg183 is unique in family X pols, the design of CXY deoxyribonucleotide analogues to enhance interaction is a possible strategy for inhibiting BER selectively in cancer cells.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Oertell K,Wu Y,Zakharova VM,Kashemirov BA,Shock DD,Beard WA,Wilson SH,McKenna CE,Goodman MF

doi

10.1021/bi3010335

subject

Has Abstract

pub_date

2012-10-30 00:00:00

pages

8491-501

issue

43

eissn

0006-2960

issn

1520-4995

journal_volume

51

pub_type

杂志文章

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