2KBJ
solution structure of BmKalphaTx11 (minor conformation)
Summary for 2KBJ
| Entry DOI | 10.2210/pdb2kbj/pdb |
| Related | 2KBH 2KBK |
| Descriptor | Toxin Bmka2 (1 entity in total) |
| Functional Keywords | protein, ionic channel inhibitor, neurotoxin, secreted, sodium channel inhibitor, toxin |
| Biological source | Mesobuthus martensii (Manchurian scorpion) |
| Cellular location | Secreted: Q9NJC7 |
| Total number of polymer chains | 1 |
| Total formula weight | 7468.42 |
| Authors | |
| Primary citation | Zhu, J.,Tong, X.,Cao, C.,Wu, G.,Zhang, N.,Wu, H. Solution structure of BmKalphaTx11, a toxin from the venom of the Chinese scorpion Buthus martensii Karsch Biochem.Biophys.Res.Commun., 391:627-633, 2010 Cited by PubMed Abstract: The solution structure of BmKalphaTx11 presented by this paper is distinctive from any other structures of wide-type scorpion alpha-toxins reported so far, for its trans-9,10 peptide bond conformation is accompanied by 'protruding' topology of the 'NC-domain'. The orientation of the C-tail of BmKalphaTx11 is obviously different from that of classical alpha-toxins (e.g., AaH2, BmK-M8), despite the fact that they share common trans conformation of peptide bond between residues 9 and 10. Accordingly, there must be other structural factors dominating the orientation of the C-tail except the conformation of peptide bond 9-10. Our study reveals that residues at position 58 play an important role in it, and different type of residues at this position (e.g., Lys, Arg, Met, Ile) result in different spatial relationship between the C-terminus and the 'five-residue-turn' and then different topology of the 'NC-domain', therefore residues at position 58 are believed to function as structure and bioactivity switch for specificity of scorpion alpha-toxins. The mechanism for stabilizing the geometry of the 'NC-domain' in wide-type scorpion alpha-toxins is also discussed. PubMed: 19932686DOI: 10.1016/j.bbrc.2009.11.110 PDB entries with the same primary citation |
| Experimental method | SOLUTION NMR |
Structure validation
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