2ec5 | pdb_00002ec5

Crystal structures reveal a thiol-protease like catalytic triad in the C-terminal region of Pasteurella multocida toxin

spinqualitylabelsall models 2ec5, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2ec5 is a 2 chain structure with sequence from Pasteurella multocida. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 2ebf, 2ebh Gene: toxA (Pasteurella multocida) Resources: FirstGlance, OCA, RCSB, PDBsum Function [TOXA_PASMU] This is a dermonecrotic toxin. This osteolytic toxin, induces bone resorption. Potent mitogen. This toxin is associated with the severe progressive form of the atrophic rhinitis, a major respiratory disease in pigs. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Pasteurella multocida toxin (PMT), one of the virulence factors produced by the bacteria, exerts its toxicity by up-regulating various signaling cascades downstream of the heterotrimeric GTPases Gq and G12/13 in an unknown fashion. Here, we present the crystal structure of the C-terminal region (residues 575-1,285) of PMT, which carries an intracellularly active moiety. The overall structure of C-terminal region of PMT displays a Trojan horse-like shape, composed of three domains with a "feet"-,"body"-, and "head"-type arrangement, which were designated C1, C2, and C3 from the N to the C terminus, respectively. The C1 domain, showing marked similarity in steric structure to the N-terminal domain of Clostridium difficile toxin B, was found to lead the toxin molecule to the plasma membrane. The C3 domain possesses the Cys-His-Asp catalytic triad that is organized only when the Cys is released from a disulfide bond. The steric alignment of the triad corresponded well to that of papain or other enzymes carrying Cys-His-Asp. PMT toxicities on target cells were completely abrogated when one of the amino acids constituting the triad was mutated. Our results indicate that PMT is an enzyme toxin carrying the cysteine protease-like catalytic triad dependent on the redox state and functions on the cytoplasmic face of the plasma membrane of target cells. Crystal structures reveal a thiol protease-like catalytic triad in the C-terminal region of Pasteurella multocida toxin.,Kitadokoro K, Kamitani S, Miyazawa M, Hanajima-Ozawa M, Fukui A, Miyake M, Horiguchi Y Proc Natl Acad Sci U S A. 2007 Mar 20;104(12):5139-44. Epub 2007 Mar 14. PMID:17360394 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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