The gated gait of the processive molecular motor, myosin V.
Article Details
- CitationCopy to clipboard
Veigel C, Wang F, Bartoo ML, Sellers JR, Molloy JE
The gated gait of the processive molecular motor, myosin V.
Nat Cell Biol. 2002 Jan;4(1):59-65. doi: 10.1038/ncb732.
- PubMed ID
- 11740494 [ View in PubMed]
- Abstract
Class V myosins are actin-based molecular motors involved in vesicular and organellar transport. Single myosin V molecules move processively along F-actin, taking several 36-nm steps for each diffusional encounter. Here we have measured the mechanical interactions between mouse brain myosin V and rabbit skeletal F-actin. The working stroke produced by a myosin V head is approximately 25 nm, consisting of two separate mechanical phases (20 + 5 nm). We show that there are preferred myosin binding positions (target zones) every 36 nm along the actin filament, and propose that the 36-nm steps of the double-headed motor are a combination of the working stroke (25 nm) of the bound head and a biased, thermally driven diffusive movement (11 nm) of the free head onto the next target zone. The second phase of the working stroke (5 nm) acts as a gate - like an escapement in a clock, coordinating the ATPase cycles of the two myosin V heads. This mechanism increases processivity and enables a single myosin V molecule to travel distances of several hundred nanometres along the actin filament.
DrugBank Data that Cites this Article
- Drugs