A novel partner for the GTP-bound forms of rho and rac.
Using the yeast two hybrid system and overlay assays we identified a putative rholrac effector, citron, which interacts with the GTP-bound forms of rho and rac1, but not with cdc42. Extensive homologies to known proteins were not observed. This 183 kDa protein contains a C6H2 zinc finger, a PH domain, and a long coiled-coil forming region including 4 leucine zippers and the rholrac binding site. We recently identified three others putative rho effectors characterized by a common rho binding motif. Citron does not share this motif and displays a distinctive protein organization, thus defining a separate class of rho partners.
Second Department of Pharmacology, Faculty of Medicine, Kyoto University, Japan.
P
P
Madaule
T
T
Furuyashiki
T
T
Reid
T
T
Ishizaki
G
G
Watanabe
N
N
Morii
S
S
Narumiya
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D018797:Cell Cycle Proteins; D002460:Cell Line; D018076:DNA, Complementary; D019204:GTP-Binding Proteins / Q000378:metabolism*; D006160:Guanosine Triphosphate / Q000378:metabolism*; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D011485:Protein Binding; D017346:Protein Serine-Threonine Kinases; D011506:Proteins / Q000737:chemistry / Q000378:metabolism*; D015398:Signal Transduction; D020744:rac GTP-Binding Proteins; D018631:ras Proteins; D020741:rho GTP-Binding Proteins; D020742:rhoA GTP-Binding Protein; D020743:rhoB GTP-Binding Protein; D000075024:rhoC GTP-Binding Protein
D018797:Cell Cycle Proteins; D018076:DNA, Complementary; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D011506:Proteins; D006160:Guanosine Triphosphate; C115635:citron-kinase; D017346:Protein Serine-Threonine Kinases; D019204:GTP-Binding Proteins; C512911:Rhoc protein, mouse; D020744:rac GTP-Binding Proteins; D018631:ras Proteins; D020741:rho GTP-Binding Proteins; D020742:rhoA GTP-Binding Protein; D020743:rhoB GTP-Binding Protein; D000075024:rhoC GTP-Binding Protein