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• W2034482517 startingPage "1895" @default.
• W2034482517 abstract "Single strand nicks and gaps in DNA have been reported to increase the efficiency of nucleosome loading mediated by chromatin assembly factor 1 (CAF-1). However, on mismatch-containing substrates, these strand discontinuities are utilized by the mismatch repair (MMR) system as loading sites for exonuclease 1, at which degradation of the error-containing strand commences. Because packaging of DNA into chromatin might inhibit MMR, we were interested to learn whether chromatin assembly is differentially regulated on heteroduplex and homoduplex substrates. We now show that the presence of a mismatch in a nicked plasmid substrate delays nucleosome loading in human cell extracts. Our data also suggest that, once the mismatch is removed, repair of the single-stranded gap is accompanied by efficient nucleosome loading. We postulated that the balance between MMR and chromatin assembly might be governed by proliferating cell nuclear antigen (PCNA), the processivity factor of replicative DNA polymerases, which is loaded at DNA termini and which interacts with the MSH6 subunit of the mismatch recognition factor MutSα, as well as with CAF-1. We now show that this regulation might be more complex; MutSα and CAF-1 interact not only with PCNA, but also with each other. In vivo this interaction increases during S-phase and may be controlled by the phosphorylation status of the p150 subunit of CAF-1." @default.
• W2034482517 created "2016-06-24" @default.
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• W2034482517 date "2012-01-09" @default.
• W2034482517 modified "2023-10-14" @default.
• W2034482517 title "Interplay between mismatch repair and chromatin assembly" @default.
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• W2034482517 doi "https://doi.org/10.1073/pnas.1106696109" @default.
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