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Mol. Cell. Biol., Jun 1996, 3112-3124, Vol 16, No. 6
T Ito, M Bulger, R Kobayashi and JT Kadonaga
We describe the cloning and analysis of Drosophila nucleosome assembly
protein 1 (dNAP-1), a core histone-binding protein that functions with
other chromatin assembly activities in a Drosophila chromatin assembly
factor 1-containing fraction (dCAF-1 fraction) in the ATP-facilitated
assembly of regularly spaced nucleosomal arrays from purified core histones
and DNA. Purified, recombinant dNAP-1 acts cooperatively with a factor(s)
in the dCAF-1 fraction in the efficient and DNA replication- independent
assembly of chromatin. In the presence of histone H1, the repeat length of
the chromatin is similar to that of native chromatin from Drosophila
embryos. By coimmunoprecipitation analysis, dNAP-1 was found to be
associated with histones H2A and H2B in a crude whole- embryo extract,
which suggests that dNAP-1 is bound to the histones in vivo. Studies of the
localization of dNAP-1 in the Drosophila embryo revealed that the factor is
present in the nucleus during S phase and is predominantly cytoplasmic
during G2 phase. These data suggest that NAP-1 acts as a core histone
shuttle which delivers the histones from the cytoplasm to the chromatin
assembly machinery in the nucleus. Thus, NAP-1 appears to be one component
of a multifactor chromatin assembly machinery that mediates the
ATP-facilitated assembly of regularly spaced nucleosomal arrays.
Copyright © 1996, American Society for Microbiology
Drosophila NAP-1 is a core histone chaperone that functions in ATP- facilitated assembly of regularly spaced nucleosomal arrays
Department of Biology, University of California at San Diego, La Jolla 92093-0347, USA.
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