Steven FS, Griffin MM, Wong TL, Yasmin R, Mangel WF. Further inhibition studies on guanidinobenzoatase, a trypsin-like enzyme associated with tumour cells.
JOURNAL OF ENZYME INHIBITION 1987;
1:187-201. [PMID:
3334244 DOI:
10.3109/14756368709020116]
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Abstract
Guanidinobenzoatase is a proteolytic enzyme capable of degrading fibronectin and is a tumour associated enzyme. Guanidinobenzoatase has been shown to be an arginine selective protease and is distinct from trypsin, plasminogen activator, plasmin, thrombin and a newly described tumour associated enzyme specific for guanidino phenylalanine residues. These conclusions have been derived from inhibition studies employing 4-methyl-p-guanidinobenzoate as substrate. Three active site titrants for trypsin have been shown to be good substrates for guanidinobenzoatase. A new active site titrant for trypsin, rhodamine bisguanidinobenzoate, can also be used to assay guanidinobenzoatase in a stoichiometric manner. This active site titrant can be employed to label guanidinobenzoate on the surface of leukaemia cells.
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