3p8f

Crystal Structure of MT-SP1 in complex with SFTI-1

spinqualitylabelsall models 3p8f, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3p8f is a 2 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GSH Related: 3p8g Gene: ST14 (HUMAN) Activity: Matriptase, with EC number 3.4.21.109 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [SFTI1_HELAN] Inhibits trypsin, cathepsin G, elastase, chymotrypsin and thrombin. Does not inhibit factor Xa. Publication Abstract from PubMed ABSTRACT: BACKGROUND: Matriptase is a type II transmembrane serine protease that is found on the surfaces of epithelial cells and certain cancer cells. Matriptase has been implicated in the degradation of certain extracellular matrix components as well as the activation of various cellular proteins and proteases, including hepatocyte growth factor and urokinase. Sunflower trypsin inhibitor-1 (SFTI-1), a cyclic peptide inhibitor originally isolated from sunflower seeds, exhibits potent inhibitory activity toward matriptase. RESULTS: We have engineered and produced recombinant proteins of the matriptase protease domain, and have determined the crystal structures of the protease:SFTI-1 complex at 2.0 A as well as the protease:benzamidine complex at 1.2 A. These structures elaborate the structural basis of substrate selectivity of matriptase, and show that the matriptase S1 substrate specificity pocket is larger enough to allow movement of benzamidine inside the S1 pocket. Our study also reveals that SFTI-1 binds to matriptase in a way similar to its binding to trypsin despite the significantly different isoelectric points of the two proteins (5.6 vs. 8.2). CONCLUSIONS: This work helps to define the structural basis of substrate specificity of matriptase and the interactions between the inhibitor and protease. The complex structure also provides a structural template for designing new SFTI-1 derivatives with better potency and selectivity against matriptase and other proteases. Structure of catalytic domain of Matriptase in complex with Sunflower trypsin inhibitor-1.,Yuan C, Chen L, Meehan EJ, Daly N, Craik DJ, Huang M, Ngo JC BMC Struct Biol. 2011 Jun 22;11:30. PMID:21693064 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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