1OF9
Solution structure of the pore forming toxin of entamoeba histolytica (Amoebapore A)
Summary for 1OF9
| Entry DOI | 10.2210/pdb1of9/pdb |
| Descriptor | PORE-FORMING PEPTIDE AMEOBAPORE A (1 entity in total) |
| Functional Keywords | pore forming, toxin, saplip, amoebapore a |
| Biological source | ENTAMOEBA HISTOLYTICA |
| Cellular location | Cytoplasmic granule: P34095 |
| Total number of polymer chains | 1 |
| Total formula weight | 8253.69 |
| Authors | Hecht, O.,Schleinkofer, K.,Bruhn, H.,Leippe, M.,Van Nuland, N.,Dingley, A.J.,Grotzinger, J. (deposition date: 2003-04-09, release date: 2004-02-26, Last modification date: 2024-10-16) |
| Primary citation | Hecht, O.,Van Nuland, N.,Schleinkofer, K.,Dingley, A.J.,Bruhn, H.,Leippe, M.,Grotzinger, J. Solution Structure of the Pore-Forming Protein of Entamoeba Histolytica J.Biol.Chem., 279:17834-, 2004 Cited by 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 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. PubMed: 14970207DOI: 10.1074/JBC.M312978200 PDB entries with the same primary citation |
| Experimental method | SOLUTION NMR |
Structure validation
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