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    MSH2

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    For Research Use Only. Not For Clinical Use.


    Background

    Component of the post-replicative DNA mismatch repair system (MMR). Forms two different heterodimers: MutS alpha (MSH2-MSH6 heterodimer) and MutS beta (MSH2-MSH3 heterodimer) which binds to DNA mismatches thereby initiating DNA repair. When bound, heterodimers bend the DNA helix and shields approximately 20 base pairs. MutS alpha recognizes single base mismatches and dinucleotide insertion-deletion loops (IDL) in the DNA. MutS beta recognizes larger insertion-deletion loops up to 13 nucleotides long. After mismatch binding, MutS alpha or beta forms a ternary complex with the MutL alpha heterodimer, which is thought to be responsible for directing the downstream MMR events, including strand discrimination, excision, and resynthesis. ATP binding and hydrolysis play a pivotal role in mismatch repair functions. The ATPase activity associated with MutS alpha regulates binding similar to a molecular switch: mismatched DNA provokes ADP-->ATP exchange, resulting in a discernible conformational transition that converts MutS alpha into a sliding clamp capable of hydrolysis-independent diffusion along the DNA backbone. This transition is crucial for mismatch repair. MutS alpha may also play a role in DNA homologous recombination repair. In melanocytes may modulate both UV-B-induced cell cycle regulation and apoptosis.
    Protein class

    Cancer-related genes, Disease related genes, Human disease related genes, Plasma proteins

    Predicted location

    Intracellular

    Single cell type specificity

    Low cell type specificity

    Immune cell specificity

    Low immune cell specificity

    Cell line specificity

    Low cell line specificity

    Interaction

    Component of the DNA mismatch repair (MMR) complex composed at least of MSH2, MSH3, MSH6, PMS1 and MLH1 (PubMed:26300262). Heterodimer consisting of MSH2-MSH6 (MutS alpha) or MSH2-MSH3 (MutS beta) (PubMed:8942985). Both heterodimers form a ternary complex with MutL alpha (MLH1-PMS1) (PubMed:9788596, PubMed:10856833, PubMed:11427529, PubMed:11429708, PubMed:12414623, PubMed:14676842). Interacts with MCM9; the interaction recruits MCM9 to chromatin (PubMed:26300262). Interacts with MCM8 (PubMed:26300262). Interacts with EXO1 (PubMed:9788596, PubMed:10856833, PubMed:11427529, PubMed:11429708, PubMed:12414623, PubMed:14676842). Part of the BRCA1-associated genome surveillance complex (BASC), which contains BRCA1, MSH2, MSH6, MLH1, ATM, BLM, PMS2 and the RAD50-MRE11-NBS1 protein complex (PubMed:10783165). This association could be a dynamic process changing throughout the cell cycle and within subnuclear domains (PubMed:10783165). Interacts with ATR (PubMed:14657349). Interacts with SLX4/BTBD12; this interaction is direct and links MutS beta to SLX4, a subunit of different structure-specific endonucleases (PubMed:19596235). Interacts with SMARCAD1 (PubMed:18675275).

    Molecular function

    DNA-binding

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