2zxy

Crystal Structure of Cytochrome c555 from Aquifex aeolicus

spinqualitylabelsall models 2zxy, resolution 1.15Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2zxy is a 1 chain structure with sequence from Aquifex aeolicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.15Å Ligands: HEC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function O67504_AQUAE 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 In order to elucidate the relationship between the stability and the structure of the monohaem cytochrome c(555) (AA c(555)) from the hyperthermophilic bacterium Aquifex aeolicus, chemical denaturation and crystal structure determination were carried out. AA c(555) exhibited higher stability than the thermophilic Hydrogenobacter thermophilus cytochrome c(552) (HT c(552)), which is one of the most stable cytochromes c. The three-dimensional crystal structure of AA c(555), which was determined using the multiple anomalous dispersion technique at 1.15 A resolution, included a unique 14-residue extra helix, while the side-chain interactions of several amino-acid residues responsible for the stability of HT c(552) were conserved in AA c(555). The side chain of the Met61 residue in the extra helix was aligned towards the haem, forming a coordination bond between the Met S and haem Fe atoms. In other cytochromes c the corresponding regions always form Omega loops which also include the haem-liganding Met residue and are known to be involved in the initial step in cytochrome c denaturation. The formation of the extra helix in AA c(555) results in the highest helix content, 59.8%, among the monohaem cytochromes c. The extra helix should mainly contribute to the hyperstability of AA c(555) and is presumed to be a novel strategy of cytochromes c for adaptation to a hyperthermophilic environment. Hyperstability and crystal structure of cytochrome c(555) from hyperthermophilic Aquifex aeolicus.,Obuchi M, Kawahara K, Motooka D, Nakamura S, Yamanaka M, Takeda T, Uchiyama S, Kobayashi Y, Ohkubo T, Sambongi Y Acta Crystallogr D Biol Crystallogr. 2009 Aug;65(Pt 8):804-13. Epub 2009, Jul 17. PMID:19622864 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome C 3D structures

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