JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Nucleosome assembly in mammalian cell extracts before and after DNA replication.

EMBO Journal 1990 September
Protein-free DNA in a cytosolic extract supplemented with SV40 large T-antigen (T-Ag), is assembled into chromatin structure when nuclear extract is added. This assembly was monitored by topoisomer formation, micrococcal nuclease digestion and psoralen crosslinking of the DNA. Plasmids containing SV40 sequences (ori- and ori+) were assembled into chromatin with similar efficiencies whether T-Ag was present or not. Approximately 50-80% of the number of nucleosomes in vivo could be assembled in vitro; however, the kinetics of assembly differed on replicated and unreplicated molecules. In replicative intermediates, nucleosomes were observed on both the pre-replicated and post-replicated portions. We conclude that the extent of nucleosome assembly in mammalian cell extracts is not dependent upon DNA replication, in contrast to previous suggestions. However, the highly sensitive psoralen assay revealed that DNA replication appears to facilitate precise folding of DNA in the nucleosome.

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