IUBMB Enzyme Nomenclature


Accepted name: myosin ATPase

Reaction: ATP + H2O + myosin bound to actin filament at position n = ADP + phosphate + myosin bound to actin filament at position n+1

Systematic name: ATP phosphohydrolase (actin-translocating)

Comments: Proteins of the contractile apparatus of muscle and nonmuscle cells; myosin molecule consists of two heavy chains (about 200 kDa) and two pairs of light chains (15-27 kDa). The head region of the heavy chain contains actin- and ATP-binding sites. ATP hydrolysis provides energy for actomyosin contraction.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number:


1. Rayment, I. The structural basis of myosin ATPase activity. J. Biol. Chem. 271 (1996) 15850-15853. [PMID: 8663496]

2. Hasson, T. and Mooseker, M.S. Vertebrate unconventional myosins. J. Biol. Chem. 271 (1996) 16431-16434. [PMID: 8690736]

3. Murphy, C.T. and Spudich, J.A. The sequence of the myosin 50-20K loop affects myosin's affinity for actin throughout the actin-myosin ATPase cycle and its maximum ATPase activity. Biochemistry 38 (1999) 3785-3792. [PMID: 10090768]

[EC created 1984 as EC, transferred 2000 to EC, transferred 2018 to EC]

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