Enhanced affinities and specificities of consolidated ligands for the Src homology (SH) 3 and SH2 domains of Abelson protein-tyrosine kinase

D. Cowburn, J. Zheng, Q. Xu, G. Barany

Research output: Contribution to journalArticle

32 Scopus citations


The possible interrelationships between multiple domains of proteins involved in intracellular signal transduction are complex and not easily investigated. We have synthesized a series of bivalent consolidated ligands, which interact simultaneously with the SH2 and SH3 domain of Abelson kinase in a SH(32) dual domain construct, a portion of native Abelson kinase. Affinities were measured by quenching of intrinsic tryptophan fluorescence. Consolidated ligands have enhanced affinity and specificity compared to monovalent equivalents. Affinity is also dependent on the length of the linker joining the two parts, with an optimum distance similar to that expected from structural models of Abl (SH(32). These results suggest that consolidated ligands may be generally useful reagents for probing structural and functional activities of multidomain proteins.

Original languageEnglish (US)
Pages (from-to)26738-26741
Number of pages4
JournalJournal of Biological Chemistry
Issue number45
Publication statusPublished - Jan 1 1995
Externally publishedYes


ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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