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Amino-acid sequence of parvalbumin from rabbit skeletal muscle.

Determination of the complete amino-acid sequence of rabbit skeletal muscle parvalbumin is described. The sequence of 86 of the 109 total residues was determined automatically by sequenator analyses of peptides obtained after cleavage with CNBr or with trypsin. The positions of the remaining 23 residues were determined by subtractive Edman degradation of tryptic and chymotryptic peptides. The protein has an acetylated amino terminus. Comparison of the rabbit parvalbumin with those from carp, hake, and pike and with the calcium binding subunit of rabbit muscle troponin indicates that these proteins are homologous. Among the parvalbumins a high degree of identity is observed, especially of residues involved in the binding of calcium or in the formation of the hydrophobic core.