Journal
SCIENCE
Volume 295, Issue 5557, Pages 1083-1086Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1067470
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- NIGMS NIH HHS [GM48027] Funding Source: Medline
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Lamellipodia are thin, veil-like extensions at the edge of cells that contain a dynamic array of actin filaments. We describe an approach for analyzing spatial regulation of actin polymerization and depolymerization in vivo in which we tracked single molecules of actin fused to the green fluorescent protein. Polymerization and the lifetime of actin filaments in lamellipodia were measured with high spatial precision. Basal polymerization and depolymerization occurred throughout lamellipodia with largely constant kinetics, and polymerization was promoted within one micron of the lamellipodium tip. Most of the actin filaments in the lamellipodium were generated by polymerization away from the tip.
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