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Eukaryotic MCM proteins: beyond replication initiation.

Susan L Forsburg¹

¹Molecular & Cell Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA. forsburg@salk.edu

Microbiology and Molecular Biology Reviews : MMBR

|March 10, 2004

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Minichromosome maintenance (MCM) proteins are essential for DNA replication initiation and elongation. New research reveals MCMs also play crucial roles in genome stability, including DNA damage response and transcription.

Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

The minichromosome maintenance (MCM) protein family comprises six conserved eukaryotic proteins.
Initially identified in yeast genetic screens, MCMs are crucial for DNA replication.
Their abundance and distribution suggest roles beyond replication initiation.

Purpose of the Study:

To investigate the multifaceted roles of MCM proteins in eukaryotic cells.
To explore MCM involvement in DNA replication, damage response, transcription, and chromatin structure.

Main Methods:

Genetic screens in yeast
Molecular and biochemical analyses
Structural analysis of MCM protein complexes
Analysis of mcm mutant phenotypes

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Main Results:

MCM proteins are central to DNA replication initiation and elongation, functioning as a DNA helicase.
MCMs form a heterohexameric ring structure.
MCM proteins are abundant on unreplicated chromatin.
MCMs are implicated in DNA damage response, transcription, and chromatin structure regulation.

Conclusions:

MCM proteins are essential regulators of DNA replication.
Beyond replication, MCMs are critical for maintaining genome stability through diverse chromosomal transactions.