Abstract
The inositol lipids PI(4,5)P(2) and PI(3,4,5)P(3) are important regulators of actin polymerization, but their different temporal and spatial dynamics suggest that they perform separate roles. PI(3,4,5)P(3) seems to act as an instructive second messenger, inducing local actin polymerization. PI(4,5)P(2) appears to be present at too high a concentration and homogeneous a distribution to fulfil a similar role. Instead, we suggest that PI(4,5)P(2) acts permissively, restricting new actin polymerization to the region of the plasma membrane.
MeSH Terms
Actins/metabolism
Cell Membrane/metabolism
Cell Movement/physiology
Cytoskeleton/metabolism
Neutrophils/metabolism
Phosphatidylinositol 4,5-Diphosphate/metabolism
Phosphatidylinositols/metabolism
Polymers/chemistry
Proteins/metabolism
Second Messenger Systems/physiology
Signal Transduction/physiology
Wiskott-Aldrich Syndrome Protein
Chemicals
Actins
Phosphatidylinositol 4,5-Diphosphate
Phosphatidylinositols
Polymers
Proteins
Wiskott-Aldrich Syndrome Protein
phosphoinositide-3,4,5-triphosphate
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Insall R H
School of Biosciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom. r.h.insall@bham.ac.uk
Weiner O D
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