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Metallopeptidase, neurolysin, as a novel molecular tool for analysis of properties of cancer-producing matrix metalloproteinases-2 and -9



To compare the substrate preferences of rat brain neurolysin and cancer-producing matrix metalloproteinases (MMPs), which have the same architecture in their catalytic domains, the cleavage activity of neurolysin toward MMP-specific fluorescence-quenching peptides was quantitatively measured. The results show that neurolysin effectively cleaved MOCAc ((7-methoxy coumarin-4-yl) acetyl)-RPKPYANvaWMK(Dnp(2,4-dinitrophenyl))-NH 2 , a specific substrate of MMP-2 and MMP-9, but hardly cleaved MOCAc-RPKPVENvaWRK(Dnp)-NH 2 , a specific substrate of MMP-3, suggesting that neurolysin has a similar substrate preference to MMP-2 and MMP-9. A structural comparison between neurolysin and MMP-9 showed the similar key amino acid residues for substrate recognition. The possible application of neurolysin displayed on the yeast cell surface, as a safe protein alternative to MMP-2 and MMP-9 which induce cancer cell growth, invasion, and metastasis, to analysis of properties of the MMPs, including the screening of inhibitors and analysis of inhibition mechanism etc., are also discussed.



Applied Microbiology and BiotechnologySpringer Journals

Published: Jul 1, 2007

DOI: 10.1007/s00253-007-0952-6

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