Preferred Sequences Within a Defined Cleavage Window Specify DNA 3' End-directed Cleavages by Retroviral RNases H

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2009 Sep 26

PMID 19778906

Citations 9

Authors

Sharon J Schultz

Miaohua Zhang

James J Champoux

Affiliations

Soon will be listed here.

Abstract

The RNase H activity of reverse transcriptase carries out three types of cleavage termed internal, RNA 5' end-directed, and DNA 3' end-directed. Given the strong association between the polymerase domain of reverse transcriptase and a DNA 3' primer terminus, we asked whether the distance from the primer terminus is paramount for positioning DNA 3' end-directed cleavages or whether preferred sequences and/or a cleavage window are important as they are for RNA 5' end-directed cleavages. Using the reverse transcriptases of human immunodeficiency virus, type 1 (HIV-1) and Moloney murine leukemia virus (M-MuLV), we determined the effects of sequence, distance, and substrate end structure on DNA 3' end-directed cleavages. Utilizing sequence-matched substrates, our analyses showed that DNA 3' end-directed cleavages share the same sequence preferences as RNA 5' end-directed cleavages, but the sites must fall in a narrow window between the 15th and 20th nucleotides from the recessed end for HIV-1 reverse transcriptase and between the 17th and 20th nucleotides for M-MuLV. Substrates with an RNA 5' end recessed by 1 (HIV-1) or 2-3 (M-MuLV) bases on a longer DNA could accommodate both types of end-directed cleavage, but further recession of the RNA 5' end excluded DNA 3' end-directed cleavages. For HIV-1 RNase H, the inclusion of the cognate dNTP enhanced DNA 3' end-directed cleavages at the 17th and 18th nucleotides. These data demonstrate that all three modes of retroviral RNase H cleavage share sequence determinants that may be useful in designing assays to identify inhibitors of retroviral RNases H.

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