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Nuclear receptor (NR) transcription factors bind various coreceptors, small-molecule ligands, DNA response element sequences, and transcriptional coregulator proteins to affect gene transcription. Small-molecule ligands and DNA are known to influence receptor structure, coregulator protein interaction, and function; however, little is known on the mechanism of synergy between ligand and DNA. Using...
Background: The Src homology domains, SH3 and SH2, of Abl protein tyrosine kinase regulate enzymatic activity in vivo. Abl SH3 suppresses kinase activity, whereas Abl SH2 is required for the transforming activity of the activated form of Abl. We expect that the solution structures of Abl SH3, Abl SH2 and Abl SH(32) (a dual domain comprising SH3 and SH2 subdomains) will contribute to a structural basis...
Background: Proline-rich segments in the guanine nucleotide exchange factor C3G bind much more strongly to the N-terminal Src homology 3 domain (SH3-N) of the proto-oncogene product c-Crk than to other SH3 domains. The presence of a lysine instead of an arginine in the peptides derived from C3G appears to be crucial for this specificity towards c-Crk.Results In order to understand the chemical basis...
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