MSH2:MSH6 exchanges ADP for ATP

Stable Identifier
Reaction [transition]
Homo sapiens
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After binding a mismatch, the MSH2:MSH6 (MutSalpha) heterodimer exchanges ADP for ATP, which alters its conformation to a sliding clamp or molecular switch able to diffuse in one direction along duplex DNA (Gradia et al. 1997, Blackwell et al. 1998, Gradia et al. 1999, Gradia et al. 2000). Each heterodimer can bind 2 molecules of ATP or ADP or a combination of ADP and ATP. The affinities and hydrolysis rates of the binding sites differ (Tian et al. 2009, Heinen et al. 2011). However, the exact location of a given adenosine at a given binding location and the conferred function is unclear but believed to control downstream events. Hydrolysis of the ATP by MSH2:MSH6 is not required for mismatch binding but is required for subsequent mismatch repair (Gu et al. 1998, Tian et al. 2009, Geng et al. 2012).

Literature References
PubMed ID Title Journal Year
19228687 Distinct nucleotide binding/hydrolysis properties and molar ratio of MutSalpha and MutSbeta determine their differential mismatch binding activities

Li, GM, Tian, L, Gu, L

J. Biol. Chem. 2009
9428522 The human mismatch recognition complex hMSH2-hMSH6 functions as a novel molecular switch

Gradia, S, Acharya, S, Fishel, R

Cell 1997
10660545 The role of mismatched nucleotides in activating the hMSH2-hMSH6 molecular switch

Gradia, S, Acharya, S, Fishel, R

J. Biol. Chem. 2000
9469823 ATP-dependent interaction of human mismatch repair proteins and dual role of PCNA in mismatch repair

Watanabe, H, Li, GM, McCulloch, S, Gu, L, Hong, Y

Nucleic Acids Res. 1998
9822680 Nucleotide-promoted release of hMutSalpha from heteroduplex DNA is consistent with an ATP-dependent translocation mechanism

Bjornson, KP, Blackwell, LJ, Bjornson, ES, Martik, D, Modrich, P

J. Biol. Chem. 1998
21937421 Human MSH2 (hMSH2) protein controls ATP processing by hMSH2-hMSH6

Lopez, JM, Fishel, R, Punja, N, Cook, C, Sakato, M, Cyr, JL, Heinen, CD, Hingorani, MM, Forties, RA

J. Biol. Chem. 2011
22277660 Biochemical analysis of the human mismatch repair proteins hMutS? MSH2(G674A)-MSH6 and MSH2-MSH6(T1219D)

Hingorani, M, Yamane, K, Erie, DA, Du, C, Sakato, M, Geng, H, Hsieh, P, DeRocco, V

J. Biol. Chem. 2012
10078208 hMSH2-hMSH6 forms a hydrolysis-independent sliding clamp on mismatched DNA

Wilson, T, Gradia, S, Acharya, S, Griffith, J, Fishel, R, Makhov, A, Subramanian, D

Mol. Cell 1999
Orthologous Events
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