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An analysis of CAF-1-interacting proteins reveals dynamic and direct interactions with the KU complex and 14-3-3 proteins. | LitMetric

An analysis of CAF-1-interacting proteins reveals dynamic and direct interactions with the KU complex and 14-3-3 proteins.

J Biol Chem

Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA.

Published: March 2011

AI Article Synopsis

Article Abstract

CAF-1 is essential in human cells for the de novo deposition of histones H3 and H4 at the DNA replication fork. Depletion of CAF-1 from various cell lines causes replication fork arrest, activation of the intra-S phase checkpoint, and global defects in chromatin structure. CAF-1 is also involved in coordinating inheritance of states of gene expression and in chromatin assembly following DNA repair. In this study, we generated cell lines expressing RNAi-resistant versions of CAF-1 and showed that the N-terminal 296 amino acids are dispensable for essential CAF-1 function in vivo. N-terminally truncated CAF-1 p150 was deficient in proliferating cell nuclear antigen (PCNA) binding, reinforcing the existence of two PCNA binding sites in human CAF-1, but the defect in PCNA binding had no effect on the recruitment of CAF-1 to chromatin after DNA damage or to resistance to DNA-damaging agents. Tandem affinity purification of CAF-1-interacting proteins under mild conditions revealed that CAF-1 was directly associated with the KU70/80 complex, part of the DNA-dependent protein kinase, and the phosphoserine/threonine-binding protein 14-3-3 ζ. CAF-1 was a substrate for DNA-dependent protein kinase, and the 14-3-3 interaction in vitro is dependent on DNA-dependent protein kinase phosphorylation. These results highlight that CAF-1 has prominent interactions with the DNA repair machinery but that the N terminus is dispensable for the role of CAF-1 in DNA replication- and repair-coupled chromatin assembly.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3060538PMC
http://dx.doi.org/10.1074/jbc.M110.217075DOI Listing

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