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- W2031001454 abstract "Mouse myosin V is a two-headed unconventional myosin with an extended neck that binds six calmodulins. Double-headed (heavy meromyosin-like) and single-headed (subfragment 1-like) fragments of mouse myosin V were expressed in Sf9 cells, and intact myosin V was purified from mouse brain. The actin-activated MgATPase of the tissue-purified myosin V, and its expressed fragments had a high V(max) and a low K(ATPase). Calcium regulated the MgATPase of intact myosin V but not of the fragments. Both the MgATPase activity and the in vitro motility were remarkably insensitive to ionic strength. Myosin V and its fragments translocated actin at very low myosin surface densities. ADP markedly inhibited the actin-activated MgATPase activity and the in vitro motility. ADP dissociated from myosin V subfragment 1 at a rate of about 11.5 s(-1) under conditions where the V(max) was 3.3 s(-1), indicating that, although not totally rate-limiting, ADP dissociation was close to the rate-limiting step. The high affinity for actin and the slow rate of ADP release helps the myosin head to remain attached to actin for a large fraction of each ATPase cycle and allows actin filaments to be moved by only a few myosin V molecules in vitro." @default.
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- W2031001454 date "2000-02-01" @default.
- W2031001454 modified "2023-10-17" @default.
- W2031001454 title "Effect of ADP and Ionic Strength on the Kinetic and Motile Properties of Recombinant Mouse Myosin V" @default.
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- W2031001454 doi "https://doi.org/10.1074/jbc.275.6.4329" @default.
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