Please use this identifier to cite or link to this item: https://doi.org/10.1242/jcs.064162
Title: Active Mek2 as a regulatory scaffold that promotes Pin1 binding to BPGAP1 to suppress BPGAP1-induced acute Erk activation and cell migration
Authors: Pan, C.Q. 
Liou, Y.-C. 
Low, B.C. 
Keywords: BPGAP1
Erk
Mek
Pin1
PPI
Proline-rich
RhoGAP
WW
Issue Date: 15-Mar-2010
Citation: Pan, C.Q., Liou, Y.-C., Low, B.C. (2010-03-15). Active Mek2 as a regulatory scaffold that promotes Pin1 binding to BPGAP1 to suppress BPGAP1-induced acute Erk activation and cell migration. Journal of Cell Science 123 (6) : 903-916. ScholarBank@NUS Repository. https://doi.org/10.1242/jcs.064162
Abstract: BPGAP1 is a multidomain Rho GTPase-activating protein (RhoGAP) that promotes Erk activation and cell motility. However, the molecular mechanism of how these two processes are linked and regulated remains unclear. Here, we show that the RhoGAP domain of BPGAP1 interacts with the peptidyl-prolyl cis/trans isomerase (PPI) Pin1, leading to enhanced GAP activity towards RhoA. BPGAP1 also interacted with wild-type and constitutively active Mek2, but not with its kinase-dead mutant. However, only active Mek2 could bind Pin1, acting as a scaffold to bridge Pin1 and BPGAP1 in a manner that involves the release of an autoinhibited proline-rich motif, 186-PPLP-189, proximal to the RhoGAP domain. This allows the non-canonical 186-PPLP-189 and 256-DDYGD-260 motifs of the proline-rich region and RhoGAP domain of BPGAP1 to become accessible to concerted binding by the WW and PPI domains of Pin1, respectively. Interestingly, Pin1 knockdown led to 'super-induction' of BPGAP1-induced acute, but not chronic, Erk activation upon epidermal growth factor stimulation, in a process independent of GAP modulation. Reintroducing Pin1, but not its catalytic or nonbinding mutants, reversed the effect and inhibited cell migration induced by coexpression of BPGAP1 and active Mek2. Thus, Pin1 regulates BPGAP1 function in Rho and Erk signalling, with active Mek2 serving as a novel regulatory scaffold that promotes crosstalk between RhoGAP, Pin1 and Erk in the regulation of cell migration.
Source Title: Journal of Cell Science
URI: http://scholarbank.nus.edu.sg/handle/10635/100005
ISSN: 00219533
DOI: 10.1242/jcs.064162
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