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Cell Growth & Differentiation, Vol 4, Issue 6 475-482, Copyright © 1993 by American Association of Cancer Research

ARTICLES

Members of the src family of nonreceptor tyrosine kinases share a common mechanism for membrane binding

L Silverman, M Sudol and MD Resh
Department of Cell Biology and Genetics, Memorial Sloan-Kettering Cancer Center, New York, New York 10021.

The src family of nonreceptor protein tyrosine kinases share extensive sequence homology, except for 80 NH2-terminal amino acids, thought to comprise a "unique" domain. This region is presumed to mediate interactions specific to each kinase. Recently, we identified three NH2-terminal lysine residues, crucial for pp60v-src membrane association. Surprisingly, these lysines are conserved among several src family members. Since their mechanism of membrane association is unknown, it was of interest to determine whether other tyrosine kinases also utilize their NH2-terminal domain. Here, we demonstrate that pp60v-src, p62c-yes, and p59fyn polypeptides compete with each other for membrane binding, whereas p56lck, which lacks the NH2-terminal lysine motif, has no effect. Moreover, myristylated peptides corresponding to the NH2 termini of src, yes, lyn, and fyn inhibit membrane association of pp60c-src, p62c-yes, and p59fyn. Our results suggest that src family members share a common mechanism for membrane binding, and they provide a molecular explanation for the ability of other src family members to complement pp60c-src function.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1993 by the American Association of Cancer Research.