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  • Title: Characterization of a trypsin inhibitor from equine urine.
    Author: Veeraragavan K, Singh K, Wachter E, Hochstrasser K.
    Journal: Biochem Int; 1992 Mar; 26(3):405-13. PubMed ID: 1627153.
    Abstract:
    A trypsin inhibitor was isolated from pregnant mares' urine by adsorption on bentonite and elution with aqueous pyridine followed by batch DEAE-cellulose treatment and column chromatography. Final purification to an electrophoretically homogenous glycoprotein was achieved by gel permeation chromatography. This equine urinary trypsin inhibitor (E-UTI) is acid- and heat-stable, has a molecular weight of 22 to 23 kDa, an isoelectric point of 4.55, forms a 1:1 molar complex with trypsin and has serine as its N-terminal amino acid. The N-terminal amino acid sequence of this protein is almost identical with that of EI-14, the inhibitor obtained from horse serum by tryptic treatment, except for two extra amino acid residues, Ser-Lys- on the N-terminal end of E-UTI. In its isoelectric point E-UTI differs from EI-14 and the inhibitor from human urine.
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