Assembly of regularly spaced nucleosome arrays by Drosophila chromatin assembly factor 1 and a 56-kDa histone-binding protein.
To ascertain the mechanism by which nucleosomes are assembled by factors derived from Drosophila embryos, two proteins termed Drosophila chromatin assembly factors (CAFs) 1 and 4 (dCAF-1 and dCAF-4) were fractionated and purified from a Drosophila embryo extract. The assembly of chromatin by dCAF-1, dCAF-4, purified histones, ATP, and DNA is a process that generates regularly spaced nucleosomal arrays with a repeat length that resembles that of bulk native Drosophila chromatin and is not obligatorily coupled to DNA replication. The assembly of chromatin by dCAF-1 and dCAF-4 is nearly complete within 10 min. The dCAF-1 activity copurified with the Drosophila version of chromatin assembly factor-1 (CAF-1), a factor that has been found to be required for the assembly of chromatin during large tumor (T) antigen-mediated, simian virus 40 (SV40) origin-dependent DNA replication. The dCAF-4 activity copurified with a 56-kDa core-histone-binding protein that was purified to > 90% homogeneity.
Department of Biology, University of California, San Diego, La Jolla 92093-0347, USA.
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Kamakaka
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Kadonaga
D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002352:Carrier Proteins / Q000378:metabolism; D002843:Chromatin / Q000378:metabolism / Q000648:ultrastructure*; D056504:Chromatin Assembly Factor-1; D002868:Chromosomal Proteins, Non-Histone; D004247:DNA / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism*; D004330:Drosophila; D006657:Histones / Q000378:metabolism*; D009707:Nucleosomes / Q000378:metabolism* / Q000648:ultrastructure; D013045:Species Specificity
D002352:Carrier Proteins; D002843:Chromatin; D056504:Chromatin Assembly Factor-1; D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D006657:Histones; D009707:Nucleosomes; D000255:Adenosine Triphosphate; D004247:DNA