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  • Title: Binding of sulfobromophthalein to rat and human ligandins: characterization of a binding-site peptide.
    Author: Bhargava MM, Dasgupta A.
    Journal: Biochim Biophys Acta; 1988 Aug 10; 955(3):296-300. PubMed ID: 3401490.
    Abstract:
    Photoaffinity techniques were employed to affect the covalent binding of [35S]sulfobromophthalein to proteins of rat and human liver cytosol. In rat liver cytosol at low concentrations, sulfobromophthalein bound to the 22 kDa subunit of ligandin. In human liver cytosol, binding to a 23.5 kDa subunit was observed. At higher concentrations, sulfobromophthalein also bound to 12, 23.5, 37, and 42 kDa peptides. When the peptides resulting from CNBr cleavage of [35S]sulfobromophthalein-ligandin complex were resolved by high-performance liquid chromatography, radioactivity was associated with two peptides. The peptide containing 80% of the radioactivity was isolated and characterized. Its molecular weight is 3.4 kDa, it contains the single tryptophan residue of ligandin and has a glutamate (glutamine) as the N-terminal amino acid.
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