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

Formin-dependent actin assembly is regulated by distinct modes of Rho signaling in yeast.
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DOI:
10.1083/jcb.200212040
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发表时间:
2003-06-23
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Bretscher A
Bretscher A
中科院分区:
其他
文献类型:
--
作者:
Dong Y;Pruyne D;Bretscher A

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形成蛋白是由Rho-GTP酶调节的肌动蛋白丝成核剂。在芽殖酵母中,形成蛋白Bni 1 p和Bnr 1 p指导肌动蛋白电缆的组装,其引导极化分泌和生长。从六个酵母Rho蛋白(Cdc 42 p和Rho 1 - 5 p),我们已经确定,四个参与调节的活性。我们表明,Rho 3 p和Rho 4p的基本功能是激活formins Bni 1 p和Bnr 1 p,并且激活的等位基因的任何一个都能够绕过这些Rho蛋白的要求。通过一个单独的信号通路,Rho 1 p是必要的,在高温下,通过蛋白激酶C(Pkc 1 p),主要效应器Rho 1 p信号转导到肌动蛋白细胞骨架的激活。虽然Pkc 1 p也激活MAPK通路,但该通路在MAPK激活中不起作用。依赖于形成的电缆组件不需要Cdc 42 p,但在Cdc 42 p功能的情况下,电缆组件在芽生长的起始过程中没有被适当地组织。这些结果表明,Rho的功能是在三个不同的,必要的Rho信号通路的控制下。
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.
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