Abstract
The binding site of the guanine moiety of GTP on beta-tubulin was located within the peptide consisting of residues 63-77, AILVDLEPGTMDSVR. The result was obtained using direct photoaffinity labeling, peptide sequencing, and limited proteolysis. Peptides were identified by end-labeling with a monoclonal antibody against beta-tubulin whose epitope was located between 3 and 4 kDa from the C terminus. The sequence of the GTP-binding site is consistent with predictions from other GTP-binding proteins such as elongation factor Tu or ras p21.
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