1r0r

1.1 Angstrom Resolution Structure of the Complex Between the Protein Inhibitor, OMTKY3, and the Serine Protease, Subtilisin Carlsberg

spinqualitylabelsall models 1r0r, resolution 1.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1r0r is a 2 chain structure with sequence from Bacillus licheniformis and Meleagris gallopavo. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.1Å Ligands: CA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SUBC_BACLI Subtilisin is an extracellular alkaline serine protease, it catalyzes the hydrolysis of proteins and peptide amides (PubMed:11109488, Ref.4). Shows high specificity for aromatic and hydrophobic amino acids in the P1 substrate position (PubMed:11109488). May play an important role in the degradation of feather keratin (PubMed:11109488). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Proteins with flexible binding surfaces can interact with numerous binding partners. However, this promiscuity is more difficult to understand in "rigid-body" proteins, whose binding results in little, or no, change in the position of backbone atoms. The binding of Kazal inhibitors to serine proteases is considered a classic case of rigid-body binding, although they bind to a wide range of proteases. We have studied the thermodynamics of binding of the Kazal serine protease inhibitor, turkey ovomucoid third domain (OMTKY3), to the serine protease subtilisin Carlsberg using isothermal titration calorimetry and have determined the crystal structure of the complex at very high resolution (1.1A). Comparison of the binding energetics and structure to other OMTKY3 interactions demonstrates that small changes in the position of side-chains can make significant contributions to the binding thermodynamics, including the enthalpy of binding. These effects emphasize that small, "rigid-body" proteins are still dynamic structures, and these dynamics make contributions to both the enthalpy and entropy of binding interactions. Structure and energetics of protein-protein interactions: the role of conformational heterogeneity in OMTKY3 binding to serine proteases.,Horn JR, Ramaswamy S, Murphy KP J Mol Biol. 2003 Aug 8;331(2):497-508. PMID:12888355 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Subtilisin 3D structures

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