2efz

Solution Structure of an M-1 Conotoxin with a novel disulfide linkage

spinqualitylabelsall models 2efz Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2efz is a 1 chain structure with sequence from Conus marmoreus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR, 20 models Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CM3E_CONMR Intracranially injection into mice does not elicit symptoms. Publication Abstract from PubMed The M-superfamily of conotoxins has a typical Cys framework (-CC-C-C-CC-), and is one of the eight major superfamilies found in the venom of the cone snail. Depending on the number of residues located in the last Cys loop (between Cys4 and Cys5), the M-superfamily family can be divided into four branches, namely M-1, -2, -3 and -4. Recently, two M-1 branch conotoxins (mr3e and tx3a) have been reported to possess a new disulfide bond arrangement between Cys1 and Cys5, Cys2 and Cys4, and Cys3 and Cys6, which is different from those seen in the M-2 and M-4 branches. Here we report the 3D structure of mr3e determined by 2D (1)H NMR in aqueous solution. Twenty converged structures of this peptide were obtained on the basis of 190 distance constraints obtained from NOE connectivities, as well as six varphi dihedral angle, three hydrogen bond, and three disulfide bond constraints. The rmsd values about the averaged coordinates of the backbone atoms were 0.43 +/- 0.19 A. Although mr3e has the same Cys arrangement as M-2 and M-4 conotoxins, it adopts a distinctive backbone conformation with the overall molecule resembling a 'flying bird'. Thus, different disulfide linkages may be employed by conotoxins with the same Cys framework to result in a more diversified backbone scaffold. Solution structure of an M-1 conotoxin with a novel disulfide linkage.,Du WH, Han YH, Huang FJ, Li J, Chi CW, Fang WH FEBS J. 2007 May;274(10):2596-602. Epub 2007 Apr 16. PMID:17437523 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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