Eukaryotic MCM proteins: beyond replication initiation

SL Forsburg - Microbiology and Molecular Biology Reviews, 2004 - Am Soc Microbiol
Microbiology and Molecular Biology Reviews, 2004Am Soc Microbiol
The minichromosome maintenance (or MCM) protein family is composed of six related
proteins that are conserved in all eukaryotes. They were first identified by genetic screens in
yeast and subsequently analyzed in other experimental systems using molecular and
biochemical methods. Early data led to the identification of MCMs as central players in the
initiation of DNA replication. More recent studies have shown that MCM proteins also
function in replication elongation, probably as a DNA helicase. This is consistent with …
Summary
The minichromosome maintenance (or MCM) protein family is composed of six related proteins that are conserved in all eukaryotes. They were first identified by genetic screens in yeast and subsequently analyzed in other experimental systems using molecular and biochemical methods. Early data led to the identification of MCMs as central players in the initiation of DNA replication. More recent studies have shown that MCM proteins also function in replication elongation, probably as a DNA helicase. This is consistent with structural analysis showing that the proteins interact together in a heterohexameric ring. However, MCMs are strikingly abundant and far exceed the stoichiometry of replication origins; they are widely distributed on unreplicated chromatin. Analysis of mcm mutant phenotypes and interactions with other factors have now implicated the MCM proteins in other chromosome transactions including damage response, transcription, and chromatin structure. These experiments indicate that the MCMs are central players in many aspects of genome stability.
American Society for Microbiology