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, 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]