Self-assembly of filopodia-like structures on supported lipid bilayers.
Self-assembly of filopodia-like structures on supported lipid bilayers.
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DOI:
10.1126/science.1191710
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发表时间:
2010-09-10
期刊:
影响因子:
--
通讯作者:
Kirschner MW
中科院分区:
文献类型:
--
作者:
Lee K;Gallop JL;Rambani K;Kirschner MW
Filopodia are finger-like protrusive structures, containing actin bundles. By incubating frog egg extracts with supported lipid bilayers containing phosphatidylinositol(4,5)bisphosphate, we have reconstituted the assembly of filopodia-like structures (FLSs). The actin assembles into parallel bundles and known filopodial components localize to the tip and shaft. The filopodia tip complexes self-organize—they are not templated by preexisting membrane microdomains. The F-BAR domain protein toca-1 recruits N-WASP, followed by the Arp2/3 complex and actin. Elongation proteins, Diaphanous-related formin, VASP and fascin are recruited subsequently. Although the Arp2/3 complex is required for FLS initiation, it is not essential for elongation, which involves formins. We propose that filopodia form via clustering of Arp 2/3 complex activators, self-assembly of filopodial tip complexes on the membrane, and outgrowth of actin bundles.
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