The unique domain as the site on Lyn kinase for its constitutive association with the high affinity receptor for IgE

被引:102
作者
Vonakis, BM
Chen, HX
HaleemSmith, H
Metzger, H
机构
[1] Arthritis and Rheumatism Branch, NIAMS, National Institutes of Health, Bethesda
[2] NIAMS, NIH, MSC 1820, Bethesda, MD 20892-1820
关键词
D O I
10.1074/jbc.272.38.24072
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
Aggregation of the high affinity receptor for IgE (Fc epsilon RI) leads to the phosphorylation of tyrosines on the beta and gamma chains of the receptor by the Src family kinase Lyn. We have studied the interaction between Lyn and the Fc epsilon RI in vivo using a transfection-based approach. Fc epsilon RI were stably transfected into Chinese hamster ovary cells. The small amount of endogenous Src family kinase was sufficient to phosphorylate receptor tyrosines upon extensive aggregation of Fc epsilon RI but not after addition of dimers of IgE. Upon stable co-transfection of Lyn kinase into the cells, dimers were now able to stimulate receptor phosphorylation and the response to more extensive aggregation was enhanced. In contrast, co-transfection with catalytically inactive Lyn inhibited the aggregation-induced phosphorylation by the endogenous kinase, and a quantitatively similar inhibition was observed in cells transfected with the SH4-containing unique domain of Lyn. Consistent with the results of others using alternative approaches, our additional studies using a yeast two-hybrid system detected a direct interaction between intact Lyn or its unique domain and the C-terminal cytoplasmic domain of the beta chain but not with the receptor's other cytoplasmic domains.
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页码:24072 / 24080
页数:9
相关论文
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