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. 1992 Nov;12(11):5087–5093. doi: 10.1128/mcb.12.11.5087

A limited set of SH2 domains binds BCR through a high-affinity phosphotyrosine-independent interaction.

A J Muller 1, A M Pendergast 1, M H Havlik 1, L Puil 1, T Pawson 1, O N Witte 1
PMCID: PMC360442  PMID: 1383690

Abstract

SH2 (src homology region 2) domains are implicated in protein-protein interactions involved in signal transduction pathways. Isolated SH2 domains bind proteins that are tyrosine phosphorylated. A novel, phosphotyrosine-independent binding interaction between BCR, the Philadelphia chromosome breakpoint cluster region gene product, and the SH2 domain of its translocation partner c-ABL has recently been reported. We have examined the ability of additional SH2 domains to bind phosphotyrosine-free BCR and compared this with their ability to bind tyrosine-phosphorylated c-ABL 1b. Of 11 individual SH2 domains examined, 8 exhibited relatively high affinity for c-ABL 1b, whereas only 4 exhibited relatively high affinity for BCR. Binding of tyrosine-phosphorylated c-ABL 1b by the relatively high-affinity ABL and ARG SH2 domains was quantitatively analyzed, and equilibrium dissociation constants for both interactions were estimated to be in the range of 5 x 10(-7) M. The ABL SH2 domain exhibited relatively high affinity for phosphotyrosine-free BCR as well; however, this interaction appears to be about two orders of magnitude weaker than binding of tyrosine-phosphorylated c-ABL 1b. The ARG SH2 domain exhibited relatively weak affinity for BCR and was determined to bind about 10-fold less strongly than the ABL SH2 domain. The ABL and ARG SH2 domains differ by only 10 of 91 amino acids, and the substitution of ABL-specific amino acids into either the amino- or carboxy-terminal half of the ARG SH2 domain was found to increase its affinity for BCR. We discuss these results in terms of a model which has been proposed for peptide binding by class I histocompatibility glycoproteins.

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Selected References

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