3eh3

Structure of the reduced form of cytochrome ba3 oxidase from Thermus thermophilus

spinqualitylabelsall models 3eh3, resolution 3.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3eh3 is a 3 chain structure with sequence from Thet8. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CU1, CUA, HAS, HEM Related: 2qpd, 2qpe, 1xme, 3eh4, 3eh5 Gene: cbaA, TTHA1135 (THET8), cbaB, ctaC, TTHA1134 (THET8), cbaD, TTHA1133 (THET8) Activity: Cytochrome-c oxidase, with EC number 1.9.3.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [COX2_THET8] Subunits I and II form the functional core of the enzyme complex. Electrons originating in cytochrome c are transferred via heme a and Cu(A) to the binuclear center formed by heme a3 and Cu(B). 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 Three paths for obtaining crystals of reduced (II-E4Q/I-K258R) cytochrome ba(3) are described, and the structures of these are reported at approximately 2.8-3.0 A resolution. Microspectrophotometry of single crystals of Thermus ba(3) oxidase at 100 K was used to show that crystals of the oxidized enzyme are reduced in an intense X-ray (beam line 7-1 at the Stanford Synchrotron Radiation Laboratory), being nearly complete in 1 min. The previously reported structures of ba(3) (Protein Data Bank entries 1EHK and 1XME ), having a crystallographically detectable water between the Cu(B) and Fe(a3) metals of the dinuclear center, actually represent the X-ray radiation-reduced enzyme. Dithionite-reduced crystals or crystals formed from dithionite-reduced enzyme revealed the absence of the above-mentioned water and an increase in the Cu(B)-Fe(a3) distance of approximately 0.3 A. The new structures are discussed in terms of enzyme function. An unexpected optical absorption envelope at approximately 590 nm is also reported. This spectral feature is tentatively thought to arise from a five-coordinate, low-spin, ferrous heme a(3) that is trapped in the frozen crystals. Combined microspectrophotometric and crystallographic examination of chemically reduced and X-ray radiation-reduced forms of cytochrome ba3 oxidase from Thermus thermophilus: structure of the reduced form of the enzyme.,Liu B, Chen Y, Doukov T, Soltis SM, Stout CD, Fee JA Biochemistry. 2009 Feb 10;48(5):820-6. PMID:19140675 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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