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- W1526700183 abstract "The structure of replicating simian virus 40 (SV40) minichromosomes was studied by DNA crosslinking with trimethyl-psoralen. The procedure was used both in vitro with extracted SV40 minichromosomes as well as in vivo with SV40-infected cells. Both procedures gave essentially the same results. Mature SV40 minichromosomes are estimated to contain about 27 nucleosomes (error +/- 2), except for those molecules with a nucleosome-free gap, which are interpreted to contain 25 nucleosomes (error +/- 2). In replicative intermediates, nucleosomes are present in the unreplicated parental stem with the replication fork possibly penetrating into the nucleosomal DNA before the histone octamer is removed. Nucleosomes reassociate on the newly replicated DNA branches at distances from the branch point of 225 ( +/- 145) nucleotides on the leading strand and of 285( +/- 120) nucleotides on the lagging strand. In the presence of cycloheximide, daughter duplexes contained unequal numbers of nucleosomes, supporting dispersive and random segregation of parental nucleosomes. These were arranged in clusters with normal nucleosome spacing. We detected a novel type of interlocked dimer comprising two fully replicated molecules connected by a single-stranded DNA bridge. We cannot decide whether these dimers represent hemicatenanes or whether the two circles are joined by a Holliday-type structure. The joining site maps within the replication terminus. We propose that these dimers represent molecules engaged in strand segregation." @default.
- W1526700183 created "2016-06-24" @default.
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- W1526700183 date "1986-05-01" @default.
- W1526700183 modified "2023-09-23" @default.
- W1526700183 title "Structure of replicating simian virus 40 minichromosomes" @default.
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- W1526700183 doi "https://doi.org/10.1016/0022-2836(86)90390-6" @default.
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