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Proc Natl Acad Sci U S A. 2006 Feb 14;103(7):2103-8. Epub 2006 Feb 3.

Dictyostelium myosin II mechanochemistry promotes active behavior of the cortex on long time scales.

Author information

1
Department of Cell Biology, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA.

Abstract

Cell cortices rearrange dynamically to complete cytokinesis, crawlin response to chemoattractant, build tissues, and make neuronal connections. Highly enriched in the cell cortex, actin, myosin II, and actin crosslinkers facilitate cortical movements. Because cortical behavior is the consequence of nanoscale biochemical events, it is essential to probe the cortex at this level. Here, we use high-resolution laser-based particle tracking to examine how myosin II mechanochemistry and dynacortin-mediated actin crosslinking control cortex dynamics in Dictyostelium. Consistent with its low duty ratio, myosin II does not directly drive active bead motility. Instead, myosin II and dynacortin antagonistically regulate other active processes in the living cortex.

PMID:
16461463
PMCID:
PMC1413706
DOI:
10.1073/pnas.0508819103
[Indexed for MEDLINE]
Free PMC Article

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