Published online 5 February 2001. doi:10.1083/jcb.152.3.579
© The Rockefeller University Press,
0021-9525/2001//579 $5.00
The Journal of Cell Biology, Volume 152, Number 3,
, 2001 579-594
Cdc42hs Facilitates Cytoskeletal Reorganization and Neurite Outgrowth by Localizing the 58-Kd Insulin Receptor Substrate to Filamentous Actin
Sheila Govinda,
Robert Kozmaa,b,
Clinton Monfriesa,b,
Louis Lima,b, and
Sohail Ahmeda,b
a Department of Neurochemistry, Institute of Neurology, London WC1N 1PJ, United Kingdom
b Glaxo-IMCB Group, Institute of Molecular and Cell Biology, Singapore 119076
Department of Neurochemistry, Institute of Neurology, 1 Wakefield St., London WC1N 1PJ, UK.44-020-7278-704544-020-7278-1552
s.ahmed{at}ion.ucl.ac.uk
Cdc42Hs is involved in cytoskeletal reorganization and is required for neurite outgrowth in N1E-115 cells. To investigate the molecular mechanism by which Cdc42Hs regulates these processes, a search for novel Cdc42Hs protein partners was undertaken by yeast two-hybrid assay. Here, we identify the 58-kD substrate of the insulin receptor tyrosine kinase (IRS-58) as a Cdc42Hs target. IRS-58 is a brain-enriched protein comprising at least four protein–protein interaction sites: a Cdc42Hs binding site, an Src homology (SH)3-binding site, an SH3 domain, and a tryptophan, tyrptophan (WW)-binding domain. Expression of IRS-58 in Swiss 3T3 cells leads to reorganization of the filamentous (F)-actin cytoskeleton, involving loss of stress fibers and formation of filopodia and clusters. In N1E-115 cells IRS-58 induces neurite outgrowth with high complexity. Expression of a deletion mutant of IRS-58, which lacks the SH3- and WW-binding domains, induced neurite extension without complexity in N1E-115 cells. In Swiss 3T3 cells and N1E-115 cells, IRS-58 colocalizes with F-actin in clusters and filopodia. An IRS-581267N mutant unable to bind Cdc42Hs failed to localize with F-actin to induce neurite outgrowth or significant cytoskeletal reorganization. These results suggest that Cdc42Hs facilitates cytoskeletal reorganization and neurite outgrowth by localizing protein complexes via adaptor proteins such as IRS-58 to F-actin.
Key Words: Cdc42Hs F-actin filopodia neurite outgrowth cytoskeleton
© 2001 The Rockefeller University Press
Abbreviations used in this paper: ACK, activated Cdc42-associated kinase; BAI1, brain-specific angiogenesis inhibitor 1; BD, binding domain; CRIB, Cdc42/Rac interactive binding; FC, focal complex; GAP, GTPase activating protein; GST, glutathione S-transferase; HA, hemagglutinin; IRS, insulin receptor tyrosine kinase; MTN, multiple tissue Northern; N-WASP, neural WASP; PAK, p21-activated kinase; SH, Src homology; WASP, Wiskott-Aldrich syndrome protein; WW, tryptophan, tryptophan.

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