title: [Thiol peptides from the aspartate transaminase of chicken heart cytosol].
abstract: Aspartate transaminase from chicken heart cytosol was immobilized covalently on activated thiol-Sepharose and digested with trypsin. After washing, the thiol-containing peptides were eluted with 2-mercaptoethanol and further purified by gel-filtration and paper chromatography. Three pure cysteinyl peptides were isolated. One of them may be represented as Ile-(Asp, Met, Cys, Gly, Leu, Thr2)-Lys; this peptide is identical to the fragment comprizing residues 387--395 in the peptide chain of aspartate transaminase from pig heart cytosol. It thus contains a cysteine residue homologous to Cys-390 of the pig heart enzyme. The second cysteinyl peptide had the following composition and partial sequence: Tyr-Phe-Val-Ser-Glu-Gly-Phe-Glu-Leu-Phe (Cys, Ala, Glu, Ser2, Phe)Lys, which corresponds to the sequence 242--258 of the pig enzyme and thus contains a cysteine residue homologous to Cys-252. The third cysteinyl peptide was similar to the tryptic peptide of the pig enzyme containing Cys-191.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D001219:Aspartate Aminotransferases; D002645:Chickens; D003545:Cysteine / Q000032:analysis; D003600:Cytosol / Q000201:enzymology; D009206:Myocardium / Q000201:enzymology*; D010446:Peptide Fragments / Q000032:analysis
chemical_list: D000596:Amino Acids; D010446:Peptide Fragments; D001219:Aspartate Aminotransferases; D003545:Cysteine
vernacular_title: Tiolovye peptidy iz tsitoplazmaticheskoĭ aspartat-transaminazy serdtsa kur.