Platelet-derived growth factor receptor tyrosine phosphorylation requires protein geranylgeranylation but not farnesylation

被引:103
作者
McGuire, TF
Qian, YM
Vogt, A
Hamilton, AD
Sebti, SM
机构
[1] UNIV PITTSBURGH,SCH MED,DEPT PHARMACOL,PITTSBURGH,PA 15261
[2] UNIV PITTSBURGH,SCH ARTS & SCI,DEPT CHEM,PITTSBURGH,PA 15261
关键词
D O I
10.1074/jbc.271.44.27402
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
We have used specific inhibitors for farnesyltransferase (FTase) and geranylgeranyltransferase (GGTase) I as well as combinations of lovastatin with geranylgeraniol (GGOH) or farnesol (FOR) to investigate the role of protein prenylation in platelet-derived growth factor (PDGF)-induced PDGF receptor tyrosine phosphorylation, NIH-3T3 cells treated with the highly specific FTase inhibitor FTI-277 had no effect on PDGF receptor tyrosine phosphorylation or PDGF activation of mitogen-activated protein kinase (MAPK) at doses that completely inhibit FTase-dependent processing. In contrast, treatment of these cells with GGTase I inhibitor GGTI-298 strongly inhibited receptor tyrosine phosphorylation, and co-treatment with FTI-277 had no additional effect, Interestingly, the inhibitory effect of GGTI-298 on PDGF activation of MAPK was only partial, Furthermore, although lovastatin, which inhibits both protein geranylgeranylation and protein farnesylation, blocked PDGF receptor tyrosine phosphorylation, co-treatment with GGOH, but mat FOH, reversed the lovastatin block, In addition, although lovastatin was observed to block MAPK activation by PDGF, co-treatment with GGOH, but not FOH, Pestered its activation, Further investigations indicated that inhibition of receptor tyrosine phosphorylation was blot: due to decreased expression of the receptor or to inhibition of GGTase II, Thus, these results demonstrate that PDGF receptor tyrosine phosphorylation requires protein geranylgeranylation but not protein farnesylation and that the tyrosine phosphorylation levels of the receptor are modulated by a protein that is a substrate for GGTase I.
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页码:27402 / 27407
页数:6
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