Deletion of the cruciform binding domain in CBP/14-3-3 displays reduced origin binding and initiation of DNA replication in budding yeast.

Abstract:

BACKGROUND:Initiation of eukaryotic DNA replication involves many protein-protein and protein-DNA interactions. We have previously shown that 14-3-3 proteins bind cruciform DNA and associate with mammalian and yeast replication origins in a cell cycle dependent manner. RESULTS:By expressing the human 14-3-3epsilon, as the sole member of 14-3-3 proteins family in Saccharomyces cerevisiae, we show that 14-3-3epsilon complements the S. cerevisiae Bmh1/Bmh2 double knockout, conserves its cruciform binding activity, and associates in vivo with the yeast replication origins ARS307. Deletion of the alpha5-helix, the potential cruciform binding domain of 14-3-3, decreased the cruciform binding activity of the protein as well as its association with the yeast replication origins ARS307 and ARS1. Furthermore, the mutant cells had a reduced ability to stably maintain plasmids bearing one or multiple origins. CONCLUSION:14-3-3, a cruciform DNA binding protein, associates with yeast origins of replication and functions as an initiator of DNA replication, presumably through binding to cruciform DNA forming at yeast replicators.

journal_name

BMC Mol Biol

journal_title

BMC molecular biology

authors

Yahyaoui W,Callejo M,Price GB,Zannis-Hadjopoulos M

doi

10.1186/1471-2199-8-27

subject

Has Abstract

pub_date

2007-04-12 00:00:00

pages

27

issn

1471-2199

pii

1471-2199-8-27

journal_volume

8

pub_type

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