title: Dipeptidylpeptidase IV--inactivation with N-peptidyl-O-aroyl hydroxylamines.
abstract: Eleven N-peptidyl-O-aroyl hydroxylamines have been synthesized and their hydrolytic stability, acidity and properties during reaction with dipeptidyl peptidase IV (E.C. 3.4.14.5) investigated. N-peptidyl-O-(4-nitrobenzoyl) hydroxylamines act as irreversible inhibitors of serine proteases. The serine enzyme, dipeptidyl peptidase IV (DP IV), is inactivated by substrate analog derivatives of this class by a suicide inactivation mechanism. During the enzyme reaction of DP IV with the suicide substrates most molecules are hydrolyzed but some irreversibly inactivate the target enzyme. In contrast to porcine pancreatic elastase and thermitase, DP IV exhibits a high ratio for hydrolysis of the compounds versus inhibition during their interaction with the enzyme. Variation of the leaving aroyl residue lowers this ratio. Variation of the substrate analog peptide moieties of the DP IV-inhibitors increases their ability to inhibit the enzyme to a remarkable extent. Possible reaction pathways are discussed.
authors.affiliation: Department of Biosciences, Martin Luther University, Halle, German Democratic Republic.
authors.forename: H U
authors.initials: HU
authors.lastname: Demuth
authors.forename: R
authors.initials: R
authors.lastname: Baumgrass
authors.forename: C
authors.initials: C
authors.lastname: Schaper
authors.forename: G
authors.initials: G
authors.lastname: Fischer
authors.forename: A
authors.initials: A
authors.lastname: Barth
mesh_terms: D004151:Dipeptides / Q000494:pharmacology*; D018819:Dipeptidyl Peptidase 4; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases / Q000037:antagonists & inhibitors*; D006898:Hydroxylamines / Q000138:chemical synthesis / Q000494:pharmacology*; D007202:Indicators and Reagents; D007700:Kinetics; D013329:Structure-Activity Relationship
chemical_list: D004151:Dipeptides; D006898:Hydroxylamines; D007202:Indicators and Reagents; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases; D018819:Dipeptidyl Peptidase 4