title: Non-pancreatic hydrolysis of N-benzoyl-l-tyrosyl-p-aminobenzoic acid (PABA-peptide) in the human small intestine.
abstract: 1. Hydrolysis of N-benzoyl-L-tyrosyl-p-aminobenzoic acid (PABA-peptide) has been measured in soluble and particulate fractions of human small intestinal mucosa. 2. Both soluble and particulate fractions contained enzymic activity capable of splitting the PABA-peptide. In the particulate fractions this activity increased threefold towards the distal small intestine. 3. Neither soluble nor particulate activity was inhibited by the chymotrypsin inhibitor 1-chloro-4-phenyl-3-L-toluene-p-sulphonamidobutan-2-one (TPCK). 4. Column chromatography on Sephacryl S-300 resolved a peak of PABA-peptide hydrolase activity that was clearly distinct from other known brush-border peptide hydrolases and from added chymotrypsin standard. 5. This PABA-peptide hydrolase thus represents a distinct intestinal enzyme, possibly bound to the brush-border membrane, which could account for the residual urinary PABA recovery observed in patients and animal models with exocrine pancreatic insufficiency.
mesh_terms: D010129:4-Aminobenzoic Acid / Q000378:metabolism*; D000328:Adult; D062365:Aminobenzoates / Q000378:metabolism*; D002850:Chromatography, Gel; D006801:Humans; D006868:Hydrolysis; D007413:Intestinal Mucosa / Q000378:metabolism*; D007421:Intestine, Small / Q000378:metabolism; D010186:Pancreatic Function Tests; D010447:Peptide Hydrolases / Q000378:metabolism; D062366:para-Aminobenzoates
chemical_list: D062365:Aminobenzoates; D062366:para-Aminobenzoates; C006717:bentiromide; D010447:Peptide Hydrolases; D010129:4-Aminobenzoic Acid