The anaphase-promoting complex/cyclosome activator Cdh1 modulates Rho GTPase by targeting p190 RhoGAP for degradation.
Cdh1 is an activator of the anaphase-promoting complex/cyclosome and contributes to mitotic exit and G(1) maintenance by targeting cell cycle proteins for degradation. However, Cdh1 is expressed and active in postmitotic or quiescent cells, suggesting that it has functions other than cell cycle control. Here, we found that homozygous Cdh1 gene-trapped (Cdh1(GT/GT)) mouse embryonic fibroblasts (MEFs) and Cdh1-depleted HeLa cells reduced stress fiber formation significantly. The GTP-bound active Rho protein was apparently decreased in the Cdh1-depleted cells. The p190 protein, a major GTPase-activating protein for Rho, accumulated both in Cdh1(GT/GT) MEFs and in Cdh1-knockdown HeLa cells. Cdh1 formed a physical complex with p190 and stimulated the efficient ubiquitination of p190, both in in vitro and in vivo. The motility of Cdh1-depleted HeLa cells was impaired; however, codepletion of p190 rescued the migration activity of these cells. Moreover, Cdh1(GT/GT) embryos exhibited phenotypes similar to those observed for Rho-associated kinase I and II knockout mice: eyelid closure delay and disruptive architecture with frequent thrombus formation in the placental labyrinth layer, respectively. Furthermore, the p190 protein accumulated in the Cdh1(GT/GT) embryonic tissues. Our data revealed a novel function for Cdh1 as a regulator of Rho and provided insights into the role of Cdh1 in cell cytoskeleton organization and cell motility.
Division of Gene Regulation, Institute for Advanced Medical Research, Keio University School of Medicine, Tokyo 160-8582, Japan.
Hideaki
H
Naoe
Kimi
K
Araki
Osamu
O
Nagano
Yusuke
Y
Kobayashi
Jo
J
Ishizawa
Tatsuyuki
T
Chiyoda
Takatsune
T
Shimizu
Ken-ichi
K
Yamamura
Yutaka
Y
Sasaki
Hideyuki
H
Saya
Shinji
S
Kuninaka
D000199:Actins / Q000378:metabolism; D064173:Anaphase-Promoting Complex-Cyclosome; D000818:Animals; D001483:Base Sequence; D064200:Cdh1 Proteins; D018797:Cell Cycle Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D002465:Cell Movement / Q000502:physiology; D002478:Cells, Cultured; D003599:Cytoskeleton / Q000378:metabolism; D017931:DNA Primers / Q000235:genetics; D020690:GTPase-Activating Proteins / Q000737:chemistry / Q000378:metabolism*; D055785:Gene Knockdown Techniques; D020662:Guanine Nucleotide Exchange Factors / Q000737:chemistry / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D051379:Mice; D018345:Mice, Knockout; D046912:Multiprotein Complexes; D034741:RNA, Small Interfering / Q000235:genetics; D012097:Repressor Proteins / Q000737:chemistry / Q000378:metabolism*; D043743:Ubiquitin-Protein Ligase Complexes / Q000737:chemistry / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D054875:Ubiquitination; D020741:rho GTP-Binding Proteins / Q000378:metabolism*
C074560:ARHGAP35 protein, human; D000199:Actins; C513041:Arhgap35 protein, mouse; D064200:Cdh1 Proteins; D018797:Cell Cycle Proteins; D017931:DNA Primers; C577584:FZR1 protein, human; C577585:Fzr1 protein, mouse; D020690:GTPase-Activating Proteins; D020662:Guanine Nucleotide Exchange Factors; D046912:Multiprotein Complexes; D034741:RNA, Small Interfering; D012097:Repressor Proteins; D043743:Ubiquitin-Protein Ligase Complexes; D064173:Anaphase-Promoting Complex-Cyclosome; D020741:rho GTP-Binding Proteins