Editor-in-Chief: Brüne, Bernhard
Editorial Board Member: Buchner, Johannes / Lei, Ming / Ludwig, Stephan / Sies, Helmut / Thomas, Douglas D. / Turk, Boris / Wittinghofer, Alfred
12 Issues per year
IMPACT FACTOR 2016: 3.273
CiteScore 2016: 3.01
SCImago Journal Rank (SJR) 2015: 1.607
Source Normalized Impact per Paper (SNIP) 2015: 0.751
Discovery of Chemokine Substrates for Matrix Metalloproteinases by Exosite Scanning: A New Tool for Degradomics
Increasingly it is being recognized that matrix metalloproteinases (MMPs) are important processing enzymes that regulate cellular behaviour and immune cell function by selective proteolysis of cell surface receptors and adhesion molecules, cytokines and growth factors. These functions will likely prove to be as important in vivo as the proposed roles of MMPs in pathological matrix degradation. To screen for new protease substrates we have reported a novel exosite scanning strategy that utilizes protease substrate binding exosite domains as yeast twohybrid baits. We discovered that the chemokine monocyte chemoattractant protein-3 (MCP-3) binds the hemopexin C domain of gelatinase A (MMP-2) leading to its efficient cleavage, converting an agonist to a potent receptor antagonist. We have now found that other MMPs cleave MCP-1, MCP-2, MCP-3, MCP-4, SDF 1α and SDF-1β indicating that the intersection between the chemokine and MMP families is broad with important implications for the control of inflammatory and immune processes. Use of engineered substrates with altered exosite binding affinities further revealed the power of exosites in dictating proteolytic specificity either directing cleavage of nonpreferred sites or in other cases virtually eliminating proteolysis of readily accessible scissile bonds. Hence, bioinformatic searches for protease substrates based on scissile bond preference will only reveal a subset of substrates unless the influence of exosites is considered.
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