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cDNA studies have suggested that inter-alpha-trypsin inhibitor (ITI) is a complex of several different peptide chains; the sequence of the inhibitory part of ITI is in excellent agreement with that of the urinary trypsin inhibitor (UTI). The present report demonstrates that a compound immunologically related to UTI is released by digestion with porcine pancreatic elastase or human leucocyte elastase. Since UTI has been shown to be a proteoglycan, ITI has been treated by chondroitinase. In these conditions, ITI is dissociated and gives rise to two heavy chains (78 and 85 kDa) and one light chain (26 kDa) immunologically related to UTI and which in PAGE moves close to UTIc (produced by chondroitinase treatment of UTI). We suggest that ITI is a non-covalent complex comprising two heavy chains and one light chain immunologically related to UTI and which is also a proteoglycan.

A Proteoglycan Related to the Urinary Trypsin Inhibitor (UTI) Links the two Heavy Chains of Inter-α-Trypsin Inhibitor