1eax: Difference between revisions
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|PDB= 1eax |SIZE=350|CAPTION= <scene name='initialview01'>1eax</scene>, resolution 1.30Å | |PDB= 1eax |SIZE=350|CAPTION= <scene name='initialview01'>1eax</scene>, resolution 1.30Å | ||
|SITE= <scene name='pdbsite=SO4:Ben+Binding+Site+For+Chain+A'>SO4</scene> | |SITE= <scene name='pdbsite=SO4:Ben+Binding+Site+For+Chain+A'>SO4</scene> | ||
|LIGAND= <scene name='pdbligand= | |LIGAND= <scene name='pdbligand=BEN:BENZAMIDINE'>BEN</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene> | ||
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY= | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1eax FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1eax OCA], [http://www.ebi.ac.uk/pdbsum/1eax PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1eax RCSB]</span> | |||
}} | }} | ||
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==Overview== | ==Overview== | ||
The type II transmembrane multidomain serine proteinase MT-SP1/matriptase is highly expressed in many human cancer-derived cell lines and has been implicated in extracellular matrix re-modeling, tumor growth, and metastasis. We have expressed the catalytic domain of MT-SP1 and solved the crystal structures of complexes with benzamidine at 1.3 A and bovine pancreatic trypsin inhibitor at 2.9 A. MT-SP1 exhibits a trypsin-like serine proteinase fold, featuring a unique nine-residue 60-insertion loop that influences interactions with protein substrates. The structure discloses a trypsin-like S1 pocket, a small hydrophobic S2 subsite, and an open negatively charged S4 cavity that favors the binding of basic P3/P4 residues. A complementary charge pattern on the surface opposite the active site cleft suggests a distinct docking of the preceding low density lipoprotein receptor class A domain. The benzamidine crystals possess a freely accessible active site and are hence well suited for soaking small molecules, facilitating the improvement of inhibitors. The crystal structure of the MT-SP1 complex with bovine pancreatic trypsin inhibitor serves as a model for hepatocyte growth factor activator inhibitor 1, the physiological inhibitor of MT-SP1, and suggests determinants for the substrate specificity. | The type II transmembrane multidomain serine proteinase MT-SP1/matriptase is highly expressed in many human cancer-derived cell lines and has been implicated in extracellular matrix re-modeling, tumor growth, and metastasis. We have expressed the catalytic domain of MT-SP1 and solved the crystal structures of complexes with benzamidine at 1.3 A and bovine pancreatic trypsin inhibitor at 2.9 A. MT-SP1 exhibits a trypsin-like serine proteinase fold, featuring a unique nine-residue 60-insertion loop that influences interactions with protein substrates. The structure discloses a trypsin-like S1 pocket, a small hydrophobic S2 subsite, and an open negatively charged S4 cavity that favors the binding of basic P3/P4 residues. A complementary charge pattern on the surface opposite the active site cleft suggests a distinct docking of the preceding low density lipoprotein receptor class A domain. The benzamidine crystals possess a freely accessible active site and are hence well suited for soaking small molecules, facilitating the improvement of inhibitors. The crystal structure of the MT-SP1 complex with bovine pancreatic trypsin inhibitor serves as a model for hepatocyte growth factor activator inhibitor 1, the physiological inhibitor of MT-SP1, and suggests determinants for the substrate specificity. | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: Bode, W.]] | [[Category: Bode, W.]] | ||
[[Category: Friedrich, R.]] | [[Category: Friedrich, R.]] | ||
[[Category: matrix degradation]] | [[Category: matrix degradation]] | ||
[[Category: serine proteinase]] | [[Category: serine proteinase]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 19:58:54 2008'' | ||