PMID: 1212216Oct 1, 1975Paper

The primary structure of troponin T and the interaction with tropomyosin

The Biochemical Journal
P JacksonS B Perry

Abstract

1. Eight peptides were separated from the CNBr digest of troponin T from rabbit white skeletal muscle and characterized. 2. By study of the amino acid sequence of the methionine-containing peptides isolated after chymotryptic and tryptic digestion and of the N- and C-terminals of the CNBr peptides, six of the latter were shown to be arranged in the sequence CNB1-CNB2-CNB5-CNB6-CNB8-CNB7. The other two peptides, CNB1' and CNB3, have been shown to be partial digestion products. 3. The CNBr peptides CNB1' and CNB2 contained a common sequence and were the only peptides in CNBr digests of troponin T that formed a complex with tropomyosin as judged by viscometric and electrophoretic studies. 4. It is concluded that tropomyosin interacts with the N-terminal half of the troponin T molecule approximately in the region lying between residues 70 and 160. 5. Electrophoretic evidence indicates that tropomyosin and troponin C interact with troponin T. 6. None of the major CNBr peptides of troponin T isolated formed a complex with troponin C on electrophoresis at pH 8.6.

Citations

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