title: Dipeptidyl peptidase IV of human lymphocytes. Evidence for specific hydrolysis of glycylproline p-nitroanilide in T-lymphocytes.
abstract: Glycylproline p-nitroanilide is hydrolysed in lymphocytes from human blood exclusively by dipeptidyl peptidase IV. This was demonstrated by specific inhibition with N-alanylprolyl-O-(4-nitrobenzoyl)hydroxylamine and di-isopropyl phosphorofluoridate and by studying the membrane localization of dipeptidyl peptidase IV and determining specific dipeptidyl peptidase II activity. Additional evidence that dipeptidyl peptidase IV is a marker for T-lymphocytes, obtained from determinations of biochemical activity on intact lymphocyte preparations and correlation studies with other T-cell markers, is also presented.
mesh_terms: D004151:Dipeptides / Q000097:blood* / Q000494:pharmacology; D018819:Dipeptidyl Peptidase 4; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases / Q000097:blood*; D010450:Endopeptidases / Q000097:blood*; D006801:Humans; D006868:Hydrolysis; D006898:Hydroxylamines / Q000494:pharmacology; D007531:Isoflurophate / Q000494:pharmacology; D013601:T-Lymphocytes / Q000187:drug effects / Q000201:enzymology*
chemical_list: D004151:Dipeptides; D006898:Hydroxylamines; D007531:Isoflurophate; C042892:glycylproline 4-nitroanilide; C042891:N-alanylproline-O-(4-nitrobenzoyl)hydroxylamine; D010450:Endopeptidases; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases; D018819:Dipeptidyl Peptidase 4