Evidence That Nucleosomes Inhibit Mismatch Repair in Eukaryotic Cells

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2009 Oct 8

PMID 19808662

Citations 46

Authors

Feng Li

Lei Tian

Liya Gu

Guo-Min Li

Affiliations

Soon will be listed here.

Abstract

The influence of chromatin structure on DNA metabolic processes, including DNA replication and repair, has been a matter of intensive studies in recent years. Although the human mismatch repair (MMR) reaction has been reconstituted using purified proteins, the influence of chromatin structure on human MMR is unknown. This study examines the interaction between human MutSalpha and a mismatch located within a nucleosome or between two nucleosomes. The results show that, whereas MutSalpha specifically recognizes both types of nucleosomal heteroduplexes, the protein bound the mismatch within a nucleosome with much lower efficiency than a naked heteroduplex or a heterology free of histone proteins but between two nucleosomes. Additionally, MutSalpha displays reduced ATPase- and ADP-binding activity when interacting with nucleosomal heteroduplexes. Interestingly, nucleosomes block ATP-induced MutSalpha sliding along the DNA helix when the mismatch is in between two nucleosomes. These findings suggest that nucleosomes may inhibit MMR in eukaryotic cells. The implications of these findings for our understanding of eukaryotic MMR are discussed.

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