1OF9

Solution structure of the pore forming toxin of entamoeba histolytica (Amoebapore A)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 75 
  • Conformers Submitted: 20 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

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This is version 1.2 of the entry. See complete history


Literature

Solution Structure of the Pore-Forming Protein of Entamoeba Histolytica

Hecht, O.Van Nuland, N.Schleinkofer, K.Dingley, A.J.Bruhn, H.Leippe, M.Grotzinger, J.

(2004) J Biol Chem 279: 17834

  • DOI: 10.1074/jbc.M312978200
  • Primary Citation of Related Structures:  
    1OF9

  • PubMed Abstract: 
  • Amoebapore A is a 77-residue protein from the protozoan parasite and human pathogen Entamoeba histolytica. Amoebapores lyse both bacteria and eukaryotic cells by pore formation and play a pivotal role in the destruction of host tissues during amoebiasis, one of the most life-threatening parasitic diseases ...

    Amoebapore A is a 77-residue protein from the protozoan parasite and human pathogen Entamoeba histolytica. Amoebapores lyse both bacteria and eukaryotic cells by pore formation and play a pivotal role in the destruction of host tissues during amoebiasis, one of the most life-threatening parasitic diseases. Amoebapore A belongs to the superfamily of saposin-like proteins that are characterized by a conserved disulfide bond pattern and a fold consisting of five helices. Membrane-permeabilizing effector molecules of mammalian lymphocytes such as porcine NK-lysin and the human granulysin share these structural attributes. Several mechanisms have been proposed to explain how saposin-like proteins form membrane pores. All mechanisms indicate that the surface charge distribution of these proteins is the basis of their membrane binding capacity and pore formation. Here, we have solved the structure of amoebapore A by NMR spectroscopy. We demonstrate that the specific activation step of amoebapore A depends on a pH-dependent dimerization event and is modulated by a surface-exposed histidine residue. Thus, histidine-mediated dimerization is the molecular switch for pore formation and reveals a novel activation mechanism of pore-forming toxins.


    Organizational Affiliation

    Biochemisches Institut der Christian-Albrechts-Universit├Ąt Kiel, Olshausenstr. 40 24118 Kiel, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PORE-FORMING PEPTIDE AMEOBAPORE AA77Entamoeba histolyticaMutation(s): 0 
Find proteins for P34095 (Entamoeba histolytica)
Explore P34095 
Go to UniProtKB:  P34095
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 75 
  • Conformers Submitted: 20 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 
  • OLDERADO: 1OF9 Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-02-26
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance