| First Author | Chu LY | Year | 2005 |
| Journal | Biochem Biophys Res Commun | Volume | 330 |
| Issue | 2 | Pages | 474-82 |
| PubMed ID | 15796907 | Mgi Jnum | J:97430 |
| Mgi Id | MGI:3575447 | Doi | 10.1016/j.bbrc.2005.03.011 |
| Citation | Chu LY, et al. (2005) Dimerize RACK1 upon transformation with oncogenic ras. Biochem Biophys Res Commun 330(2):474-82 |
| abstractText | From our previous studies, we learned that syndecan-2/p120-GAP complex provided docking site for Src to prosecute tyrosine kinase activity upon transformation with oncogenic ras. And, RACK1 protein was reactive with syndecan-2 to keep Src inactivated, but not when Ras was overexpressed. In the present study, we characterized the reaction between RACK1 protein and Ras. RACK1 was isolated from BALB/3T3 cells transfected with plasmids pcDNA3.1-[S-ras(Q(61)K)] of shrimp Penaeus japonicus and RACK1 was revealed to react with GTP-K(B)-Ras(Q(61)K), not GDP-K(B)-Ras(Q(61)K). This selective interaction between RACK1 and GTP-K(B)-Ras(Q(61)K) was further confirmed with RACK1 of human placenta and mouse RACK1-encoded fusion protein. We found that RACK1 was dimerized upon reaction with GTP-K(B)-Ras(Q(61)K), as well as with 14-3-3beta and geranylgeranyl pyrophosphate, as revealed by phosphorylation with Src tyrosine kinase. We reported the complex of RACK1/GTP-K(B)-Ras(Q(61)K) reacted selectively with p120-GAP. This interaction was sufficient to dissemble RACK1 into monomers, a preferred form to compete for the binding of syndecan-2. These data indicate that the reaction of GTP-K(B)-Ras(Q(61)K) with RACK1 in dimers may operate a mechanism to deplete RACK1 from reaction with syndecan-2 upon transformation by oncogenic ras and the RACK1/GTP-Ras complex may provide a route to react with p120-GAP and recycle monomeric RACK1 to syndecan-2. |
