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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Isolation and sequence of a cDNA clone for rabbit fast skeletal muscle troponin C. Homology with calmodulin and parvalbumin.

The binding of Ca2+ to troponin C (TnC) regulates skeletal muscle contraction. We have isolated a full-length cDNA clone for fast skeletal muscle TnC from a neonatal rabbit skeletal muscle library and determined its nucleic acid sequence. The amino acid sequence deduced from this clone matches the previously reported amino acid sequence (Collins, J. H., Greaser, M. L., Potter, J. D., and Horn, M. J. (1977) J. Biol. Chem. 252, 6356-6362) except at the amino terminus. According to the nucleotide sequence, the first 2 residues of TnC are threonine-aspartic acid, which is the reverse of the order reported previously. The isolation of the adult form of TnC from a neonatal library suggests that there may be no developmental isoforms of fast TnC. The protein coding region of the fast TnC clone has 67% homology with the reported nucleotide sequence for chicken slow TnC (Putkey, J. A., Carroll, S. L., and Means, A. R. (1987) Mol. Cell. Biol. 7, 549-1553). The homologies between the nucleotide sequences of TnC, calmodulin, and parvalbumin provide evidence that all three proteins were derived from a common precursor molecule which had four Ca2+-binding sites.[1]


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