Vandooren J, Geurts N, Martens E, Van den Steen PE, Jonghe SD, Herdewijn P, Opdenakker G. Gelatin degradation assay reveals MMP-9 inhibitors and function of O-glycosylated domain.
World J Biol Chem 2011;
2:14-24. [PMID:
21537473 PMCID:
PMC3083944 DOI:
10.4331/wjbc.v2.i1.14]
[Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Revised: 11/18/2010] [Accepted: 11/25/2010] [Indexed: 02/05/2023] Open
Abstract
AIM: To establish a novel, sensitive and high-throughput gelatinolytic assay to define new inhibitors and compare domain deletion mutants of gelatinase B/matrix metalloproteinase (MMP)-9.
METHODS: Fluorogenic Dye-quenched (DQ)™-gelatin was used as a substrate and biochemical parameters (substrate and enzyme concentrations, DMSO solvent concentrations) were optimized to establish a high-throughput assay system. Various small-sized libraries (ChemDiv, InterBioScreen and ChemBridge) of heterocyclic, drug-like substances were tested and compared with prototypic inhibitors.
RESULTS: First, we designed a test system with gelatin as a natural substrate. Second, the assay was validated by selecting a novel pyrimidine-2,4,6-trione (barbiturate) inhibitor. Third, and in line with present structural data on collagenolysis, it was found that deletion of the O-glycosylated region significantly decreased gelatinolytic activity (kcat/kM± 40% less than full-length MMP-9).
CONCLUSION: The DQ™-gelatin assay is useful in high-throughput drug screening and exosite targeting. We demonstrate that flexibility between the catalytic and hemopexin domain is functionally critical for gelatinolysis.
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