1GQ0

Solution structure of Antiamoebin I, a membrane channel-forming polypeptide; NMR, 20 structures


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST ENERGY 

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This is version 1.3 of the entry. See complete history

Literature

Solution NMR studies of antiamoebin, a membrane channel-forming polypeptide.

Galbraith, T.P.Harris, R.Driscoll, P.C.Wallace, B.A.

(2003) Biophys. J. 84: 185-194

  • DOI: 10.1016/S0006-3495(03)74841-3

  • PubMed Abstract: 
  • Antiamoebin I is a membrane-active peptaibol produced by fungi of the species Emericellopsis which is capable of forming ion channels in membranes. Previous structure determinations by x-ray crystallography have shown the molecule is mostly helical, ...

    Antiamoebin I is a membrane-active peptaibol produced by fungi of the species Emericellopsis which is capable of forming ion channels in membranes. Previous structure determinations by x-ray crystallography have shown the molecule is mostly helical, with a deep bend in the center of the polypeptide, and that the backbone structure is independent of the solvent used for crystallization. In this study, the solution structure of antiamoebin was determined by NMR spectroscopy in methanol, a solvent from which one of the crystal structures was determined. The ensemble of structures produced exhibit a right-handed helical C terminus and a left-handed helical conformation toward the N-terminus, in contrast to the completely right-handed helices found in the crystal structures. The NMR results also suggest that a "hinge" region exists, which gives flexibility to the polypeptide in the central region, and which could have functional implications for the membrane insertion process. A model for the membrane insertion and assembly process is proposed based on the antiamoebin solution and crystal structures, and is contrasted with the assembly and insertion mechanism proposed for other ion channel-forming polypeptides.


    Related Citations: 
    • The structure and function of antiamoebin I, a proline-rich membrane-active polypeptide.
      Snook, C.F.,Woolley, G.A.,Oliva, G.,Pattabhi, V.,Wood, S.F.,Blundell, T.L.,Wallace, B.A.
      (1998) Structure 6: 783
    • Antiamoebin can function as a carrier or as a pore-forming peptaibol.
      Duclohier, H.,Snook, C.F.,Wallace, B.A.
      (1998) Biochim. Biophys. Acta 1415: 255


    Organizational Affiliation

    School of Crystallography, Birkbeck College, University of London, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ANTIAMOEBIN I
A
17N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000161
Query on PRD_000161
AAntiamoebin 1Peptaibol / Antibiotic

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Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST ENERGY 
  • Olderado: 1GQ0 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-01-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Atomic model, Database references, Derived calculations, Structure summary, Version format compliance
  • Version 1.2: 2012-11-30
    Type: Other
  • Version 1.3: 2017-12-20
    Type: Database references