Mechanism of Action of Ribonuclease H Isolated from Avian Myeloblastosis Virus and Escherichia Coli

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1973 Feb 1

PMID 4119789

Citations 51

Authors

J P Leis

I Berkower

J Hurwitz

Affiliations

Soon will be listed here.

Abstract

Purified preparations of RNA-dependent DNA polymerase isolated from avain myeloblastosis virus contain RNase H activity. Labeled ribohomopolymers are degraded in the presence of their complementary deoxyribopolymer, except [(3)H]poly(U).poly(dA). The degradation products formed from [(3)H]poly(A).poly(dT) were identified as oligonucleotides containing 3'-hydroxyl and 5'-phosphate termini, while AMP was not detected. The nuclease has been characterized as a processive exonuclease that requires ends of poly(A) chains for activity. Exonucleolytic attack occurs in both 5' to 3' and 3' to 5' directions.RNase H has also been purified from E. coli. This nuclease degrades all homoribopolymers tested in the presence of their complementary deoxyribopolymers to yield oligonucleotides with 5'-phosphate and 3'-hydroxyl termini. E. coli RNase H has been characterized as an endonuclease.

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