Structure of the copper sites in membrane-bound cytochrome c oxidase.

L. Powers, B. Chance, Y. C. Ching, C. P. Lee

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


The structures of membrane proteins are difficult to obtain by crystallography and may be altered by the detergents used in their extraction. X-ray absorption spectroscopy has been used to identify the structures of the copper atoms of the membrane-bound enzyme in mitochondria and in submitochondrial particles at respective concentrations of 100 and 200 micron of molar copper. To within the experimental error, the x-ray absorption spectra of the copper atoms of the membrane-bound and the Yonetani (Yonetani, T. (1961) J. Biol. Chem. 236, 1680-1688) purified oxidase are identical; all detectable shells of the active site indicate no alteration of structural parameters. Significant differences are found when compared to the Hartzell-Beinert (Hartzell, R. C., and Beinert, H. (1974) Biochim. Biophys. Acta 368, 318-338) preparation. Extended x-ray absorption fine structure technology is now adequate for the direct studies of membrane proteins in situ in their natural environment.

Original languageEnglish (US)
Pages (from-to)3160-3164
Number of pages5
JournalJournal of Biological Chemistry
Issue number7
StatePublished - Mar 5 1987

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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