NDLI: Formin-dependent actin assembly is regulated by distinct modes of Rho signaling in yeast

Content Provider	PubMed Central
Author	Dong, Yuqing Pruyne, David Bretscher, Anthony
Abstract	Formins are actin filament nucleators regulated by Rho-GTPases. In budding yeast, the formins Bni1p and Bnr1p direct the assembly of actin cables, which guide polarized secretion and growth. From the six yeast Rho proteins (Cdc42p and Rho1–5p), we have determined that four participate in the regulation of formin activity. We show that the essential function of Rho3p and Rho4p is to activate the formins Bni1p and Bnr1p, and that activated alleles of either formin are able to bypass the requirement for these Rho proteins. Through a separate signaling pathway, Rho1p is necessary for formin activation at elevated temperatures, acting through protein kinase C (Pkc1p), the major effector for Rho1p signaling to the actin cytoskeleton. Although Pkc1p also activates a MAPK pathway, this pathway does not function in formin activation. Formin-dependent cable assembly does not require Cdc42p, but in the absence of Cdc42p function, cable assembly is not properly organized during initiation of bud growth. These results show that formin function is under the control of three distinct, essential Rho signaling pathways.
Related Links	http://dx.doi.org/10.1083/jcb.200212040
Ending Page	1092
Page Count	12
Starting Page	1081
File Format	PDF
ISSN	00219525
e-ISSN	15408140
Journal	The Journal of Cell Biology
Issue Number	6
Volume Number	161
Language	English
Publisher	The Rockefeller University Press
Publisher Date	2003-06-23
Access Restriction	Open
Rights Holder	The Rockefeller University Press
Subject Keyword	Cell Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Medicine

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