Abstract
The soluble peptides from the peptic digest of the reduced S-carboxymethylated 3-carboxypropionylated adenosine triphosphatase protein have been isolated and most of their structures have been determined. About 397 residues of the protein were represented in these peptides. The reduced S-carboxymethylated protein was digested with thermolysin, and peptides containing arginine or carboxymethylcysteine were isolated and characterized. Some peptides isolated from tryptic and staphylococcal-proteinase digests of the protein are described. The information contained within the structures of these peptides has been used to reconstruct long stretches of the sequence of the ATPase protein that constitute most of the protein structure external to the lipid bilayer (Allen, Trinnaman and Green (1980) Biochem. J. 187, 591-616). The details of some of the chromatographic steps used in the isolation of the peptides and the properties of the peptides are contained in Supplementary Publication SUP 50104 (45 pages), which has been deposited with 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.
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