Similarities Between the DNA Replication Initiators of Gram-negative Bacteria Plasmids (RepA) and Eukaryotes (Orc4p)/archaea (Cdc6p)

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2001 Apr 11

PMID 11296251

Citations 17

Authors

R Giraldo

R Diaz-Orejas

Affiliations

Soon will be listed here.

Abstract

The proteins responsible for the initiation of DNA replication are thought to be essentially unrelated in bacteria and archaea/eukaryotes. Here we show that RepA, the initiator from the Pseudomonas plasmid pPS10, and the C-terminal domain of ScOrc4p, a subunit of Saccharomyces cerevisiae (Sc) origin recognition complex (ORC), share sequence similarities. Based on biochemical and spectroscopic evidence, these similarities include common structural elements, such as a winged-helix domain and a leucine-zipper dimerization motif. We have also found that ScOrc4p, as previously described for RepA-type initiators, interacts with chaperones of the Hsp70 family both in vitro and in vivo, most probably to regulate the assembly of active ORC. In evolutionary terms, our results are compatible with the recruitment of the same protein module for initiation of DNA replication by the ancestors of present-day Gram-negative bacteria plasmids, archaea, and eukaryotes.

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