Stored elastic energy powers the 60-mu m extension of the Limulus polyphemus sperm actin bundle

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During the 5 s of the acrosome reaction of Limulus polyphemus sperm, a 60-mum-long bundle of scruin-decorated actin filaments straightens from a coiled conformation and extends from the cell. To identify the motive force for this movement, we examined the possible sources of chemical and mechanical energy and show that the coil releases similar to10(-13) J of stored mechanical strain energy, whereas chemical energy derived from calcium binding is similar to10(-15) J. These measurements indicate that the coiled actin bundle extends by a spring-based mechanism, which is distinctly different from the better known polymerization or myosin-driven processes, and that calcium initiates but does not power the reaction.
Publisher
ROCKEFELLER UNIV PRESS
Issue Date
2003-09
Language
English
Article Type
Article
Keywords

BACTERIAL FLAGELLAR FILAMENTS; ACROSOMAL PROCESS; 3-DIMENSIONAL STRUCTURE; TWIST

Citation

JOURNAL OF CELL BIOLOGY, v.162, no.7, pp.1183 - 1188

ISSN
0021-9525
DOI
10.1083/jcb.200304006
URI
http://hdl.handle.net/10203/80683
Appears in Collection
ME-Journal Papers(저널논문)
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