Isolation and purification of N-formylmethionine aminopeptidase from rat intestine.
The intestinal mucosal epithelium is exposed to products of intestinal bacteria including potent inflammatory N-formylmethionyl oligopeptides. An N-formylmethionine aminopeptidase has been purified 2300-fold from rat intestine and was shown to degrade natural fMet oligopeptides from Escherichia coli culture supernatants with loss of bioactivity (release of specific granule constituents from human polymorphonuclear leucocytes) and immuno-reactivity (assessed using a polyclonal anti-fMet-Leu-Phe antiserum). The enzyme which was specific for N-terminal acyl-methionine residues had a native Mr of 340,000 and comprised four sub-units of Mr 82,000. The presence of this enzyme in intestinal mucosa could prevent absorption of intact bioactive fMet peptides produced by commensal bacteria in the gut lumen.
Sherriff
R M
RM
Department of Experimental Medicine, Wellcome Medical Research Institute, University of Otago Medical School, Dunedin, New Zealand.
Broom
M F
MF
Chadwick
V S
VS
D000595:Amino Acid Sequence; D000626:Aminopeptidases / Q000302:isolation & purification* / Q000378:metabolism; D000818:Animals; D004591:Electrophoresis, Polyacrylamide Gel; D007413:Intestinal Mucosa / Q000201:enzymology*; D007700:Kinetics; D008297:Male; D008969:Molecular Sequence Data; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000378:metabolism; D009842:Oligopeptides / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D013379:Substrate Specificity
D009842:Oligopeptides; D009240:N-Formylmethionine Leucyl-Phenylalanine; D000626:Aminopeptidases; C028008:N-formylmethionine aminopeptidase