1JOH

THE STRUCTURE OF ANTIAMOEBIN I, A MEMBRANE-ACTIVE PEPTIDE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Observed: 0.156 

Starting Model: experimental
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This is version 1.6 of the entry. See complete history


Literature

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

  • DOI: https://doi.org/10.1016/s0969-2126(98)00079-3
  • Primary Citation of Related Structures:  
    1JOH

  • PubMed Abstract: 

    Antiamoebin is a member of the peptaibol family of polypeptides and has a unique antibiotic activity: it acts as an antiamoebic agent, but does not effectively haemolyze erythrocytes even though it does exhibit membrane-modifying activity. The structure of antiamoebin I has been determined by X-ray crystallography at 1.4 A resolution. The molecule forms a helical structure, which, as a result of the presence of a number of proline and hydroxyproline residues, has a deep bend in the middle. Circular dichroism spectroscopy, single-channel conductance studies and fluorescence diffusion studies suggest a mode of ion transport that is entirely different from that of the other two members of the peptaibol family (alamethicin and zervamicin) whose structures and functions have been examined in detail. The structure of the polypeptide has been determined and a functional model for its mode of action in membranes is presented. Although under some conditions antiamoebin may form ion channels, unlike the closely related alamethicin and zervamicin polypeptides, its major membrane-modifying activity appears to be as an ion carrier.


  • Organizational Affiliation

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


Macromolecules

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ANTIAMOEBIN I
A, B
17EmericellopsisMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MOH
Query on MOH

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth B],
O [auth B],
P [auth B],
Q [auth B],
R [auth B],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
X [auth B],
Y [auth B]
METHANOL
C H4 O
OKKJLVBELUTLKV-UHFFFAOYSA-N
Modified Residues  3 Unique
IDChains TypeFormula2D DiagramParent
AIB
Query on AIB
A, B
L-PEPTIDE LINKINGC4 H9 N O2ALA
HYP
Query on HYP
A, B
L-PEPTIDE LINKINGC5 H9 N O3PRO
PHL
Query on PHL
A, B
L-PEPTIDE LINKINGC9 H13 N OPHE
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 1
IDChains NameType/Class2D Diagram3D Interactions
PRD_000161
Query on PRD_000161
A, B
Antiamoebin 1Peptaibol / Antibiotic
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Observed: 0.156 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 26.53α = 88.9
b = 28.82β = 96.64
c = 9.06γ = 123.85
Software Package:
Software NamePurpose
SHELXL-93model building
SHELXL-93refinement
SHELXL-93phasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-01-20
    Type: Initial release
  • Version 1.1: 2011-06-14
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-07-27
    Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary
  • Version 1.4: 2012-12-12
    Changes: Other
  • Version 1.5: 2020-03-04
    Changes: Data collection, Derived calculations, Other, Refinement description, Structure summary
  • Version 1.6: 2024-04-03
    Changes: Data collection, Database references, Derived calculations, Refinement description