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Originally published as Genetics Published Articles Ahead of Print on September 15, 2006.
Genetics, Vol. 174, 1917-1932, December 2006, Copyright © 2006
doi:10.1534/genetics.106.063115
SWAN-1, a Caenorhabditis elegans WD Repeat Protein of the AN11 Family, Is a Negative Regulator of Rac GTPase Function
Yieyie Yang*,1,
Jiamiao Lu*,
Joel Rovnak
,
Sandra L. Quackenbush and
Erik A. Lundquist*,2
* Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas 66045 and Department of Microbiology, Immunology and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado 80523-1619
2 Corresponding author: Department of Molecular Biosciences, University of Kansas, 1200 Sunnyside Ave., 5049 Haworth Hall, Lawrence, KS 66045.
E-mail: erikl{at}ku.edu
Rac GTPases are key regulators of cell shape and cytoskeletal organization. While some regulators of Rac activity are known, such as GTPase-activating proteins (GAPs) that repress Rac activity, other Rac regulators remain to be identified. The novel Caenorhabditis elegans WD-repeat protein SWAN-1 was identified in a yeast two-hybrid screen with the LIM domains of the Rac effector UNC-115/abLIM. SWAN-1 was found to also associate physically with Rac GTPases. The swan-1(ok267) loss-of-function mutation suppressed defects caused by the hypomorphic ced-10(n1993) allele and enhanced ectopic lamellipodia and filopodia formation induced by constitutively active Rac in C. elegans neurons. Furthermore, SWAN-1(+) transgenic expression suppressed the effects of overactive Rac, including ectopic lamellipodia and filopodia formation in C. elegans neurons, ectopic lamellipodia formation in cultured mammalian fibroblasts, and cell polarity and actin cytoskeleton defects in yeast. These studies indicate that SWAN-1 is an inhibitor of Rac GTPase function in cellular morphogenesis and cytoskeletal organization. While broadly conserved across species, SWAN-1 family members show no sequence similarity to previously known Rac inhibitors.
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