Identification of methionine-containing tryptic peptides of unstable beta-tubulin separated by reverse-phase high-performance liquid chromatography |
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Authors: | A M Minotti L M Loeb R Cook B A Boggs F Cabral |
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Affiliation: | Department of Pharmacology, University of Texas Medical School, Houston 77225. |
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Abstract: | Methods for examining altered regions in unstable mutant proteins are described. The strategy is illustrated using assembly defective Chinese hamster beta-tubulin subunits that are rapidly degraded in the cell. These unstable proteins are metabolically labeled to high specific activity and isolated as spots on two-dimensional gels. Conditions for the generation of tryptic peptides from gel pieces containing beta-tubulin and their subsequent resolution by HPLC have been worked out. Through a combination of dual labeling with various tritiated amino acids and [35S]methionine as well as partial sequence analysis, the identification of several HPLC peaks with the known sequence of beta-tubulin has been accomplished. This technique should greatly aid attempts to map the sites of mutational alterations in beta-tubulin polypeptides, and the general strategy should be readily applicable to other mutant proteins. |
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