Evidence that O6-alkylguanine-DNA alkyltransferase becomes covalently bound to DNA containing 1,3-bis(2-chloroethyl)-1-nitrosourea-induced precursors of interstrand cross-links.

Abstract:

:The reaction of partially purified human O6-alkylguanine-DNA alkyltransferase with 1,3-bis(2-chloroethyl)-1-nitrosourea-treated DNA resulted in formation of a DNA-protein covalent complex. Complex formation required active alkyltransferase and brief treatment of DNA with the drug. DNA lost its capacity to form the complex once drug-induced DNA interstrand cross-links were completely formed. These results are consistent with a model in which the transferase catalyzes cleavage at O6-guanine and transfer of the alkyl moiety in a putative O6, N1-ethanoguanine intermediate of cross-link formation. DNA-protein complex formation presumably results when the transferase accepts the N1-ethanoguanine-DNA structure, analogous to its acceptance of simple alkyl groups.

authors

Brent TP,Smith DG,Remack JS

doi

10.1016/0006-291x(87)90279-8

subject

Has Abstract

pub_date

1987-01-30 00:00:00

pages

341-7

issue

2

eissn

0006-291X

issn

1090-2104

pii

0006-291X(87)90279-8

journal_volume

142

pub_type

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