A DNA Unwinding Element and an ARS Consensus Comprise a Replication Origin Within a Yeast Chromosome

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 1993 Dec 1

PMID 8223462

Citations 47

Authors

R Y Huang

D Kowalski

Affiliations

Soon will be listed here.

Abstract

We have defined a replication origin, ORI305, within chromosome III of Saccharomyces cerevisiae by means of mutational analysis. cis-acting elements required for origin activity in the chromosome, as assayed by two-dimensional gel electrophoresis of replication intermediates, are the same as those required for the function of an autonomously replicating sequence, ARS305, in a plasmid. Essential elements include (i) an 11 bp sequence that is a near match to the ARS consensus and (ii) a broad sequence directly 3' to the consensus near match. Origin function is inactivated by point mutations in the essential near match sequence, suggesting that the sequence contributes to specifying the origin in the chromosome. Other consensus near matches with different sequences are present but are not required. The essential 3'-flanking sequence exhibits DNA helical instability and is sensitive to deletion mutations that stabilize the DNA helix. The wild-type 3'-flanking sequence can be functionally substituted by dissimilar sequences that also exhibit helical instability. The requirement for DNA helical instability indicates that the essential 3'-flanking sequence serves as a DNA unwinding element in the chromosome.

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