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. 1995 Aug 11;23(15):2865–2871. doi: 10.1093/nar/23.15.2865

Processing of deoxyuridine mismatches and abasic sites by human immunodeficiency virus type-1 integrase.

A Mazumder 1, Y Pommier 1
PMCID: PMC307123  PMID: 7659508

Abstract

We have examined the activities of HIV-1 integrase on substrates containing mismatches, composed of deoxyuridine at different positions in either the processed or nonprocessed strand of viral DNA, within and near the conserved CA dinucleotide of the U5 end of the HIV-1 LTR. Substitution in the processed strand of either the C or A of the CA dinucleotide or of the G 5' to the CA reduced strand transfer six-, three- and seven-fold respectively. 3'-processing was also reduced by substitution at the GC but not at the A. Substitution in the nonprocessed strand of the G nucleotide at the processing site abolished strand transfer while substitution of the T had no effect. DNA binding of HIV-1 integrase was not affected by deoxyuridine substitutions. Deoxyuridine substitution outside the trinucleotide remained compatible with enzyme activity. Enzymatically generated abasic sites were created at each mismatch to determine the effect of a missing base on integrase activity. Consistent with the deoxyuridine mismatch observations, 3'-processing and strand transfer were abolished when the abasic site was substituted for either of the nucleotides of the GCA trinucleotide. Integrase was, however, able to tolerate mismatches within this trinucleotide during the disintegration reaction. Taken together, these results suggest that base-mismatched or base-deleted substrates, which can be created by the proofreading-deficient HIV-1 RT, can be tolerated by HIV-1 integrase when located outside of the GCA trinucleotide at the U5 end of the LTR.

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