1ctd | pdb_00001ctd

DETERMINATION OF THE SOLUTION STRUCTURE OF A SYNTHETIC TWO-SITE CALCIUM-BINDING HOMODIMERIC PROTEIN DOMAIN BY NMR SPECTROSCOPY

spinqualitylabelsall models 1ctd Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ctd is a 2 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR, 7 models Ligands: ACE, CA, NH2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TNNC2_CHICK Troponin is the central regulatory protein of striated muscle contraction. Tn consists of three components: Tn-I which is the inhibitor of actomyosin ATPase, Tn-T which contains the binding site for tropomyosin and Tn-C. The binding of calcium to Tn-C abolishes the inhibitory action of Tn on actin filaments. 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 The solution structure of a 34-residue synthetic calcium-binding peptide from site III of chicken troponin-C has been determined by 1H NMR spectroscopy. In solution and in the presence of calcium this peptide forms a symmetric two-site homodimeric calcium-binding domain (Shaw et al., 1990). The solution structure of this dimer was determined from the measurement of 470 NOEs from a 75-ms NOESY data set. For the dimer structure determination, the constraint list included 868 distance restraints, 44 phi angles, and 24 chi 1 and 2 chi 2 angles. Seven structures were calculated by restrained molecular dynamics using a procedure in which intramonomer distances were used first and then all distances, intra- and intermonomer, were input during further dynamics. The structures exhibited a fold very similar to the C-terminal domain of troponin-C comprised of a pair of helix-loop-helix calcium-binding sites. The rms deviation of these structures for backbone atoms between residues 97-122 and 97'-122' for the dimer was 0.82 A. The dimer structure was also calculated to be more symmetric than sites III and IV in troponin-C. Determination of the solution structure of a synthetic two-site calcium-binding homodimeric protein domain by NMR spectroscopy.,Shaw GS, Hodges RS, Sykes BD Biochemistry. 1992 Oct 13;31(40):9572-80. PMID:1390738 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Troponin 3D structures

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