1w2l
Cytochrome c domain of caa3 oxygen oxidoreductaseCytochrome c domain of caa3 oxygen oxidoreductase
Structural highlights
FunctionQ9F3S9_RHOMR 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).[ARBA:ARBA00024688][RuleBase:RU004024] 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 PubMedThe cytochrome c domain of subunit II from the Rhodothermus marinus caa(3) HiPIP:oxygen oxidoreductase, a member of the superfamily of heme-copper-containing terminal oxidases, was produced in Escherichia coli and characterised. The recombinant protein, which shows the same optical absorption and redox properties as the corresponding domain in the holo enzyme, was crystallized and its structure was determined to a resolution of 1.3 A by the multiwavelength anomalous dispersion (MAD) technique using the anomalous dispersion of the heme iron atom. The model was refined to final R(cryst) and R(free) values of 13.9% and 16.7%, respectively. The structure reveals the insertion of two short antiparallel beta-strands forming a small beta-sheet, an interesting variation of the classical all alpha-helical cytochrome c fold. This modification appears to be common to all known caa(3)-type terminal oxidases, as judged by comparative modelling and by analyses of the available amino acid sequences for these enzymes. This is the first high-resolution crystal structure reported for a cytochrome c domain of a caa(3)-type terminal oxidase. The R.marinus caa(3) uses HiPIP as the redox partner. The calculation of the electrostatic potential at the molecular surface of this extra C-terminal domain provides insights into the binding to its redox partner on one side and its interaction with the remaining subunit II on the other side. Structure at 1.3 A resolution of Rhodothermus marinus caa(3) cytochrome c domain.,Srinivasan V, Rajendran C, Sousa FL, Melo AM, Saraiva LM, Pereira MM, Santana M, Teixeira M, Michel H J Mol Biol. 2005 Feb 4;345(5):1047-57. Epub 2004 Dec 7. PMID:15644203[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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