Structural highlights
1xme is a 3 chain structure with sequence from "flavobacterium_thermophilum"_yoshida_and_oshima_1971 "flavobacterium thermophilum" yoshida and oshima 1971. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
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| Ligands: | , , , , , |
| Gene: | cbaA ("Flavobacterium thermophilum" Yoshida and Oshima 1971), cbaB, ctaC ("Flavobacterium thermophilum" Yoshida and Oshima 1971), cbaD ("Flavobacterium thermophilum" Yoshida and Oshima 1971) |
| Activity: | Cytochrome-c oxidase, with EC number 1.9.3.1 |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum |
Function
[COX2_THETH] 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
Cytochrome ba(3) oxidase is an integral membrane protein identified in the thermophilic bacterium Thermus thermophilus. The enzyme has now been expressed recombinantly and purified with a histidine tag. As such, it crystallizes under similar conditions and in the same space group (P4(3)2(1)2) as the native protein. A novel cryoprotection scheme is described here to obtain high-resolution diffraction from these crystals, which involves soaking in a mixture of glycerol and ethylene glycol under a layer of oil. The unit-cell parameters for these crystals are larger than the native protein, apparently deriving from increased ordering of the N-terminus and an internal loop (residues 495-500) in subunit I. Hence, compared with native cytochrome ba(3) oxidase, the recombinant His-tagged protein is accommodated in an expanded but equally well ordered lattice via an alternate set of specific intermolecular contacts. The structure was refined against data to 2.3 angstroms resolution to an R factor of 21.7% and an R(free) of 23.7%.
A novel cryoprotection scheme for enhancing the diffraction of crystals of recombinant cytochrome ba3 oxidase from Thermus thermophilus.,Hunsicker-Wang LM, Pacoma RL, Chen Y, Fee JA, Stout CD Acta Crystallogr D Biol Crystallogr. 2005 Mar;61(Pt 3):340-3. Epub 2005, Feb 24. PMID:15735345[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Hunsicker-Wang LM, Pacoma RL, Chen Y, Fee JA, Stout CD. A novel cryoprotection scheme for enhancing the diffraction of crystals of recombinant cytochrome ba3 oxidase from Thermus thermophilus. Acta Crystallogr D Biol Crystallogr. 2005 Mar;61(Pt 3):340-3. Epub 2005, Feb 24. PMID:15735345 doi:10.1107/S0907444904033906
