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• W133027658 startingPage "462" @default.
• W133027658 abstract "Abstract We previously found that the myeloid cell surface glycoprotein CD13 (gp150) is identical to aminopeptidase N (EC 3.4.11.2), a widely distributed membrane-bound, zinc-dependent metalloprotease with an extracellular enzymatic domain that cleaves N-terminal amino acid residues from oligopeptides (J Clin Invest 83:1299, 1989). As a first step toward defining the function of this molecule on myeloid cells, we assessed cell surface-associated N-terminal peptidase activity by sensitive spectrophotometric measurements of the cleavage of p- nitroanilide amino acid derivatives. Aminopeptidase activity detected on the surface of normal and malignant hematopoietic cells coincided with the level of cell surface CD13 expression as measured by flow cytometry. The enzyme was specifically inhibited by the zinc-binding metalloprotease inhibitors, bestatin, 1,10-phenanthroline, or 2.2′- dipyridyl, but was not affected by several inhibitors of other classes of proteases. Aminopeptidase activity was demonstrated for CD13 molecules specifically immunoprecipitated from the surface of CD13- positive cells and was blocked by the metalloprotease inhibitor 1,10- phenanthroline. Moreover, cell surface aminopeptidase activity was partially inhibited when viable cells were incubated with two of a panel of 11 monoclonal antibodies (MoAbs) known to be specific for extracellular epitopes of human CD13. This inhibition was apparent in the absence of detectable downmodulation of CD13 molecules from the cell surface, suggesting that these MoAbs either physically interfere with substrate binding or alter the zinc-coordinating properties of aminopeptidase N molecules. Aminopeptidase N could play an important role in modulating signals generated by peptides at the surface of myeloid cells, either by removing key N-terminal residues from active peptides or by converting inactive peptides to active forms. The inhibitory antibodies used in this study should prove useful in delineating the physiologic roles of CD13/aminopeptidase N on normal and malignant myeloid cells." @default.
• W133027658 created "2016-06-24" @default.
• W133027658 creator A5008673690 @default.
• W133027658 creator A5085803011 @default.
• W133027658 date "1990-01-15" @default.
• W133027658 modified "2023-10-17" @default.
• W133027658 title "Metalloprotease activity of CD13/aminopeptidase N on the surface of human myeloid cells" @default.
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• W133027658 doi "https://doi.org/10.1182/blood.v75.2.462.462" @default.
• W133027658 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1967220" @default.
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