A study of the structures of the YaYa and YaYc glutathione S-transferases from rat liver cytosol: Evidence that the Ya monomer is responsible for lithocholate-binding activity

J D Hayes, R C Strange, I W Percy-Robb

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    41 Citations (Scopus)

    Abstract

    The two dimeric lithocholic acid-binding proteins previously identified as ligandin (YaYa) and glutathione S-transferase B (YaYc) were isolated from rat liver cytosol. These proteins have molecular weights of 44000 and 47000 respectively. The recovery of these two proteins from liver was not affected by the addition of the proteinase inhibitor Trasylol. No spontaneous interconversion between these two proteins was observed on storage. YaYa and YaYc proteins yielded peptides of identical molecular weight after limited digestion with Staphylococcus aureus V8 proteinase. Analytical and preparative tryptic-digest peptide 'maps' showed that all the soluble peptides obtained from YaYa protein were also recovered from YaYc protein. Approximately six extra soluble peptides, which were not recovered from YaYa protein, were obtained from the tryptic digest of YaYc protein. Subdigests of the insoluble tryptic-digest 'cores' also resulted in the recovery of identical peptides from both proteins. Evidence is presented that the Ya subunit possessed by both proteins is identical; glutathione S transferase B is a hybrid of ligandin and glutathione S-transferase AA. The Ya monomer is responsible for lithocholate binding.

    Original languageEnglish
    Pages (from-to)491-502
    Number of pages12
    JournalBiochemical Journal
    Volume197
    Issue number2
    Publication statusPublished - 1 Aug 1981

    Keywords

    • Animals
    • Carrier Proteins
    • Chromatography, Gel
    • Cytosol/enzymology
    • Electrophoresis, Polyacrylamide Gel
    • Glutathione Transferase/metabolism
    • Liver/enzymology
    • Macromolecular Substances
    • Peptide Fragments/analysis
    • Peptide Hydrolases
    • Protein Denaturation
    • Rats
    • Trypsin

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