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A preliminary investigation of the primary structure of the Ca(2+-transporting ATPase (adenosine triphosphatase) protein of rabbit skeletal-muscle sarcoplasmic reticulum is reported. The preparation of derivatives of delipidated protein in a form suitable for sequence analysis is described. Tryptic peptides containing S-carboxymethylcysteine residues were isolated from the reduced carboxymethylated protein, and their sequences were partially determined. The results are consistent with mol.wt. about 105000 for the polypeptide, and the absence of extended repeated lengths of sequence. The distribution of tryptophan and cysteine residues between large, aggregated peptides and soluble tryptic peptides shows that these residues are concentrated in different regions of the primary structure. This observation agrees with other evidence that these residues are, on the whole, widely separated in the native protein. The details of the procedures used to isolate the peptides, and the evidence for the determination of their sequences, are given Supplementary Publication SUP 50085 (30 pages), which has been deposited at the British Library Lending Division, Boston Spa, Wetherby, West Yorkshire LS23 7BQ, U.K., from whom copies can be obtained on the terms indicated in Biochem.J. (1978) 169, 5.

Primary structures of cysteine-containing peptides from the calcium ion-transporting adenosine triphosphatase of rabbit sarcoplasmic reticulum