期刊
JOURNAL OF CELL BIOLOGY
卷 159, 期 6, 页码 983-991出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.200208172
关键词
titling lever; force; thermal ratchet; mechanism; walking
类别
资金
- NIAMS NIH HHS [AR40964, R01 AR040964] Funding Source: Medline
We have used electron microscopy and single-particle image processing to study head conformation in myosin V molecules. We find that in the presence of ATP, many heads have a sharply angled conformation that is rare in its absence. The sharply angled conformation is similar to a myosin 11 atomic structure proposed to mimic the prepower stroke state. The leading head in molecules attached to actin by both heads has a similar conformation, but is also sharply angled in a second plane by tethering through the trail head. The lead head lever joins the motor domain similar to5 nm axially from where it joins the trail motor. These positions locate the converter subdomain and show the lead motor is in the prepower stroke conformation. Tethering by the trail head places the lead head motor domain at the correct axial position along the actin for binding, but at the wrong orientation. Attachment is achieved either by bending the lead head lever throughout its length or at the pliant point. The microscopy shows that most of the walking stride is produced by changes in lever angle brought about by converter movement, but is augmented by distortion produced by thermal energy.
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