Resonance Raman spectra of cytochrome c oxidase. Excitation in the 600-nm region

David F. Bocian, Gary W Brudvig, Nils O. Petersen, Gary W. Brudvig, Sunney I. Chan

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Abstract

The resonance Raman (RR) spectra of oxidized, reduced, and oxidized cyanide-bound cytochrome c oxidase with excitation at several wavelengths in the 600-nm region are presented. No evidence is found for laser-induced photoreduction of the oxidized protein with irradiation at λ ∼600 nm at 195 K, in contrast to the predominance of this process upon irradiation in the Soret region at this temperature. The Raman spectra of all three protein species are very similar, and there are no Raman bands which are readily assignable to either cytochrome a or cytochrome a3, exclusively. The Raman spectra of the three protein species do, however, exhibit a number of bands not observed in the RR spectra of other hemoproteins upon excitation in their visible absorption bands. In particular, strong Raman bands are observed in the lowfrequency region of the RR spectra (-1)- The frequencies of these bands are similar to those of the copper-ligand vibrations observed in the RR spectra of type 1 copper proteins upon excitation in the 600-nm absorption band characteristic of these proteins. In cytochrome c oxidase, these bands do not disappear upon reduction of the protein and, therefore, cannot be attributed to copper-ligand vibrations. Thus, all the observed RR bands are associated with the two heme A moieties in the enzyme.

Original languageEnglish
Pages (from-to)4396-4402
Number of pages7
JournalBiochemistry
Volume18
Issue number20
Publication statusPublished - 1979

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Electron Transport Complex IV
Raman scattering
Copper
Proteins
Vibration
Vibrations (mechanical)
Absorption spectra
Cytochromes a3
Cytochromes a
Irradiation
Ligands
Cyanides
Heme
Lasers
Wavelength
Temperature
Enzymes

ASJC Scopus subject areas

  • Biochemistry

Cite this

Bocian, D. F., Brudvig, G. W., Petersen, N. O., Brudvig, G. W., & Chan, S. I. (1979). Resonance Raman spectra of cytochrome c oxidase. Excitation in the 600-nm region. Biochemistry, 18(20), 4396-4402.

Resonance Raman spectra of cytochrome c oxidase. Excitation in the 600-nm region. / Bocian, David F.; Brudvig, Gary W; Petersen, Nils O.; Brudvig, Gary W.; Chan, Sunney I.

In: Biochemistry, Vol. 18, No. 20, 1979, p. 4396-4402.

Research output: Contribution to journalArticle

Bocian, DF, Brudvig, GW, Petersen, NO, Brudvig, GW & Chan, SI 1979, 'Resonance Raman spectra of cytochrome c oxidase. Excitation in the 600-nm region', Biochemistry, vol. 18, no. 20, pp. 4396-4402.
Bocian DF, Brudvig GW, Petersen NO, Brudvig GW, Chan SI. Resonance Raman spectra of cytochrome c oxidase. Excitation in the 600-nm region. Biochemistry. 1979;18(20):4396-4402.
Bocian, David F. ; Brudvig, Gary W ; Petersen, Nils O. ; Brudvig, Gary W. ; Chan, Sunney I. / Resonance Raman spectra of cytochrome c oxidase. Excitation in the 600-nm region. In: Biochemistry. 1979 ; Vol. 18, No. 20. pp. 4396-4402.
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N2 - The resonance Raman (RR) spectra of oxidized, reduced, and oxidized cyanide-bound cytochrome c oxidase with excitation at several wavelengths in the 600-nm region are presented. No evidence is found for laser-induced photoreduction of the oxidized protein with irradiation at λ ∼600 nm at 195 K, in contrast to the predominance of this process upon irradiation in the Soret region at this temperature. The Raman spectra of all three protein species are very similar, and there are no Raman bands which are readily assignable to either cytochrome a or cytochrome a3, exclusively. The Raman spectra of the three protein species do, however, exhibit a number of bands not observed in the RR spectra of other hemoproteins upon excitation in their visible absorption bands. In particular, strong Raman bands are observed in the lowfrequency region of the RR spectra (-1)- The frequencies of these bands are similar to those of the copper-ligand vibrations observed in the RR spectra of type 1 copper proteins upon excitation in the 600-nm absorption band characteristic of these proteins. In cytochrome c oxidase, these bands do not disappear upon reduction of the protein and, therefore, cannot be attributed to copper-ligand vibrations. Thus, all the observed RR bands are associated with the two heme A moieties in the enzyme.

AB - The resonance Raman (RR) spectra of oxidized, reduced, and oxidized cyanide-bound cytochrome c oxidase with excitation at several wavelengths in the 600-nm region are presented. No evidence is found for laser-induced photoreduction of the oxidized protein with irradiation at λ ∼600 nm at 195 K, in contrast to the predominance of this process upon irradiation in the Soret region at this temperature. The Raman spectra of all three protein species are very similar, and there are no Raman bands which are readily assignable to either cytochrome a or cytochrome a3, exclusively. The Raman spectra of the three protein species do, however, exhibit a number of bands not observed in the RR spectra of other hemoproteins upon excitation in their visible absorption bands. In particular, strong Raman bands are observed in the lowfrequency region of the RR spectra (-1)- The frequencies of these bands are similar to those of the copper-ligand vibrations observed in the RR spectra of type 1 copper proteins upon excitation in the 600-nm absorption band characteristic of these proteins. In cytochrome c oxidase, these bands do not disappear upon reduction of the protein and, therefore, cannot be attributed to copper-ligand vibrations. Thus, all the observed RR bands are associated with the two heme A moieties in the enzyme.

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