2crs | pdb_00002crs

CARDIOTOXIN III FROM TAIWAN COBRA (NAJA NAJA ATRA) DETERMINATION OF STRUCTURE IN SOLUTION AND COMPARISON WITH SHORT NEUROTOXINS

spinqualitylabelsall models 2crs, 13 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2crs is a 1 chain structure with sequence from Naja atra. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 2crt Resources: FirstGlance, OCA, RCSB, PDBsum 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 structure in solution of cardiotoxin III, a membrane toxin purified from the venom of the Taiwan cobra, Naja naja atra, is reported. Sequence-specific assignment of 1H-NMR lines was completed and the NMR data show the presence of a triple and a double-stranded antiparallel beta-sheet. Many NOE cross peaks identified in NOESY spectra were applied as distance constraints based on a hybrid distance geometry/dynamical simulated annealing technique; 20 structures were found within a single family. The average value of atomic RMS differences between the 20 structures and their geometric mean is 0.087 nm for the backbone atoms and 0.152 nm for all heavy atoms; they are 0.055 nm and 0.12 nm, respectively for the segments of secondary structure. In these selected structures the backbone of the polypeptide chain folds such that five strands emerge from a globular head. Three major loops link these strands to form a double and a triple-stranded antiparallel beta-sheet. Comparison of the structures of the toxin in solution with the X-ray crystal structure of its homologous protein, cardiotoxin V4II from Naja mossambica mossambica, showed good agreement between the structures except at segments of the turns. As the functions of short neurotoxins and cardiotoxins are distinct, despite their similar secondary structural patterns and tertiary folding, a comparative analysis has been carried out between cardiotoxin III and short neurotoxins of known structures. We discuss their structural features in order to clarify relationships between their structure and function. Cardiotoxin III from the Taiwan cobra (Naja naja atra). Determination of structure in solution and comparison with short neurotoxins.,Bhaskaran R, Huang CC, Chang DK, Yu C J Mol Biol. 1994 Jan 28;235(4):1291-301. PMID:8308891 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cardiotoxin

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