1m24 | pdb_00001m24

Trichotoxin_A50E, An Ion Channel-Forming Polypeptide

spinqualitylabelsall models 1m24, resolution 0.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1m24 is a 2 chain structure with sequence from Hypocrea rufa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CCN NonStd Res: ACE, AIB, VOL Related: 1r9u, 1dlz, 1ih9, 1gq0, 1joh, 1amt, 1ee7, 1ob7, 1ob6, 1ob4 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Trichotoxin_A50E is an 18-residue peptaibol antibiotic which forms multimeric transmembrane channels through self-association. The crystal structure of trichotoxin has been determined at a resolution of 0.9 A. The trichotoxin sequence contains nine helix-promoting Aib residues, which contribute to the formation of an entirely helical structure that has a central bend of 8-10 degrees located between residues 10-13. Trichotoxin is the first solved structure of the peptaibol family that is all alpha-helix as opposed to containing part or all 3(10)-helix. Gln residues in positions 6 and 17 produce a polar face, and are proposed to form the channel lumen. An octameric model channel has been constructed from the crystal structure. It has a central pore of approximately 4-5 A radius, a size sufficient to enable transport of ions, with a constricted region at one end, formed by a ring of Gln6 residues. Electrostatic calculations are consistent with it being a cationic channel. Model for a helical bundle channel based on the high-resolution crystal structure of trichotoxin_A50E.,Chugh JK, Bruckner H, Wallace BA Biochemistry. 2002 Oct 29;41(43):12934-41. PMID:12390019 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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