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Mol. Cell. Biol., 03 1996, 810-817, Vol 16, No. 3
RT Kamakaka, M Bulger, PD Kaufman, B Stillman and JT Kadonaga
To study the relationship between DNA replication and chromatin assembly,
we have purified a factor termed Drosophila chromatin assembly factor 1
(dCAF-1) to approximately 50% homogeneity from a nuclear extract derived
from embryos. dCAF-1 appears to consist of four polypeptides with molecular
masses of 180, 105, 75, and 55 kDa. dCAF-1 preferentially mediates
chromatin assembly of newly replicated DNA relative to unreplicated DNA
during T-antigen-dependent simian virus 40 DNA replication in vitro, as
seen with human CAF-1. Analysis of the mechanism of DNA replication-coupled
chromatin assembly revealed that both dCAF-1 and human CAF-1 mediate
chromatin assembly preferentially with previously yet newly replicated DNA
relative to unreplicated DNA. Moreover, the preferential assembly of the
postreplicative DNA was observed at 30 min after inhibition of DNA
replication by aphidicolin, but this effect slowly diminished until it was
no longer apparent at 120 min after inhibition of replication. These
findings suggest that the coupling between DNA replication and chromatin
assembly may not necessarily involve a direct interaction between the
replication and assembly factors at a replication fork.
Copyright © 1996, American Society for Microbiology
Postreplicative chromatin assembly by Drosophila and human chromatin assembly factor 1
Department of Biology and Center for Molecular Genetics, University of California at San Diego, La Jolla 92093-0347, USA.
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