title: Hydrolysis of N-formylmethionyl chemotactic peptides by endopeptidase 24.11 and endopeptidase 24.15.
abstract: Endopeptidase 24.11 (EP 24.11), a membrane-bound cell surface enzyme, modulates chemotactic responsiveness of neutrophils to f-Met-Leu-Phe. It is unknown if the enzyme degrades potent formylmethionyl tetrapeptides or if an enzyme with similar activities, endopeptidase 24.15 (EP 24.15), degrades formylated chemotactic peptides. In a study of five formylmethionyl tetrapeptides and f-Met-Leu-Phe, we found that EP 24.11 had high affinity for all peptides evaluated, although it did not effectively degrade f-Met-Ile-Leu-Phe. EP 24.15 had high affinity for three of the tetrapeptides, and for f-Met-Leu-Phe, although, for unclear reasons, it did not degrade f-Met-Ile-Leu-Phe or f-Met-Leu-Phe, the apparent natural products of Staphylococcus aureus and Escherichia coli, respectively.
authors.affiliation: Pulmonary Section, Bronx Veterans Affairs Medical Center, NY 10468, USA.
authors.forename: M
authors.initials: M
authors.lastname: Lesser
authors.forename: K
authors.initials: K
authors.lastname: Fung
authors.forename: P L
authors.initials: PL
authors.lastname: Almenoff
authors.forename: C
authors.initials: C
authors.lastname: Rosenbaum
authors.forename: C
authors.initials: C
authors.lastname: Cardozo
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001665:Binding Sites; D002630:Chemotactic Factors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006868:Hydrolysis; D066298:In Vitro Techniques; D007700:Kinetics; D008297:Male; D008666:Metalloendopeptidases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D008969:Molecular Sequence Data; D009239:N-Formylmethionine / Q000737:chemistry / Q000378:metabolism*; D015260:Neprilysin / Q000037:antagonists & inhibitors / Q000378:metabolism*; D009842:Oligopeptides / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011817:Rabbits; D051381:Rats
chemical_list: D002630:Chemotactic Factors; D009842:Oligopeptides; D009239:N-Formylmethionine; D008666:Metalloendopeptidases; D015260:Neprilysin; C022510:thimet oligopeptidase