1M24

Trichotoxin_A50E, An Ion Channel-Forming Polypeptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.9 Å
  • R-Value Free: 0.092 

wwPDB Validation 3D Report Full Report


This is version 1.6 of the entry. See complete history

Literature

Model for a Helical Bundle Channel Based on the High-Resolution Crystal Structure of Trichotoxin_A50E

Chugh, J.K.Brueckner, H.Wallace, B.A.

(2002) Biochemistry 41: 12934


  • PubMed Abstract: 
  • 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 h ...

    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.


    Organizational Affiliation

    Department of Crystallography, Birkbeck College, University of London, London WC1E 7HX, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRICHOTOXIN_A50E
A, B
19N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CCN
Query on CCN

Download SDF File 
Download CCD File 
A, B
ACETONITRILE
C2 H3 N
WEVYAHXRMPXWCK-UHFFFAOYSA-N
 Ligand Interaction
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000160
Query on PRD_000160
A,BTRICHOTOXIN A50EPeptaibol / Antibiotic

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.9 Å
  • R-Value Free: 0.092 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 9.490α = 95.77
b = 16.850β = 98.07
c = 31.680γ = 99.45
Software Package:
Software NamePurpose
SMARTdata reduction
SHELXL-97refinement
ARP/wARPmodel building
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-11-06
    Type: Initial release
  • Version 1.1: 2011-06-14
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2011-07-27
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary
  • Version 1.4: 2012-09-05
    Type: Derived calculations
  • Version 1.5: 2012-12-12
    Type: Other
  • Version 1.6: 2017-10-11
    Type: Refinement description