Essential role of CIB1 in regulating PAK1 activation and cell migration.
Essential role of CIB1 in regulating PAK1 activation and cell migration.
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DOI:
10.1083/jcb.200502090
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发表时间:
2005-08-01
期刊:
影响因子:
--
通讯作者:
Parise LV
中科院分区:
文献类型:
--
作者:
Leisner TM;Liu M;Jaffer ZM;Chernoff J;Parise LV
p21-activated kinases (PAKs) regulate many cellular processes, including cytoskeletal rearrangement and cell migration. In this study, we report a direct and specific interaction of PAK1 with a 22-kD Ca2+-binding protein, CIB1, which results in PAK1 activation both in vitro and in vivo. CIB1 binds to PAK1 within discrete regions surrounding the inhibitory switch domain in a calcium-dependent manner, providing a potential mechanism of CIB1-induced PAK1 activation. CIB1 overexpression significantly decreases cell migration on fibronectin as a result of a PAK1-and LIM kinase–dependent increase in cofilin phosphorylation. Conversely, the RNA interference–mediated depletion of CIB1 increases cell migration and reduces normal adhesion-induced PAK1 activation and cofilin phosphorylation. Together, these results demonstrate that endogenous CIB1 is required for regulated adhesion-induced PAK1 activation and preferentially induces a PAK1-dependent pathway that can negatively regulate cell migration. These results point to CIB1 as a key regulator of PAK1 activation and signaling.
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影响因子:
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作者:
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通讯作者:
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DOI:
10.1152/ajpcell.2001.281.1.c123
发表时间:
2001-07-01
影响因子:
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通讯作者:
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