The Human Homologous Pairing Protein HPP-1 is Specifically Stimulated by the Cognate Single-stranded Binding Protein HRP-A

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1991 Oct 15

PMID 1924369

Citations 29

Authors

S P MOORE

L Erdile

T Kelly

R Fishel

Affiliations

Soon will be listed here.

Abstract

Homologous pairing and strand exchange of DNA are catalyzed by the human homologous pairing protein HPP-1 in a magnesium-dependent, ATP-independent reaction that requires homologous DNA substrates and stoichiometric quantities of HPP-1. Here we show that the addition of the purified human single-strand binding (SSB) protein hRP-A to the reaction mixture stimulates the rate of homologous pairing 70-fold and reduces the amount of HPP-1 required for the reaction at least 10-fold. The identification of hRP-A as a stimulatory factor of HPP-1-catalyzed reaction was facilitated by its recognition as a member of a high molecular weight complex of recombination components. Neither the Escherichia coli SSB protein, bacteriophage T4 gene 32 protein, nor the highly conserved Saccharomyces cerevisiae yRP-A SSB protein could substitute for hRP-A in this stimulation. Because only the cognate SSB was capable of stimulating HPP-1, these results suggest that eukaryotes depend on unique and specific interactions between DNA recombination components.

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