Cytochrome C Oxidase: The Influence Of The "Open-Closed" Transition On Cytochrome A[sub]3[/sub]

Denis L. Rousseau; Yuan-chin Ching; Sanghwa Han; Massimo Sassaroli; Satish Singh

doi:10.1117/12.951595

5 July 1989 Cytochrome C Oxidase: The Influence Of The "Open-Closed" Transition On Cytochrome A₃

Denis L. Rousseau, Yuan-chin Ching, Sanghwa Han, Massimo Sassaroli, Satish Singh

Proceedings Volume 1055, Raman Scattering, Luminescence and Spectroscopic Instrumentation in Technology; (1989) https://doi.org/10.1117/12.951595
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

Cytochrome c oxidase is known to display a conformational transition from a "closed" to an "open" structure upon partial reduction. In the past exogenous ligand binding kinetic differences and differences in tryptophan fluorescence have been associated with this structural change. We report changes in the resonance Raman spectrum of NO-bound cytochrome as upon this transition. We detect changes in both the heme vibrational modes and in the Fe-N-0 bending mode. Furthermore, we have been able to identify a hydroxide-bound intermediate in the enzyme. Analysis of the conditions for its generation lead to the proposal that it is stable only in the open conformation of the protein. In both of these series of experiments advantage was taken of the photoreducibility of the heme groups by the incident laser beam.

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Denis L. Rousseau, Yuan-chin Ching, Sanghwa Han, Massimo Sassaroli, and Satish Singh "Cytochrome C Oxidase: The Influence Of The "Open-Closed" Transition On Cytochrome A₃", Proc. SPIE 1055, Raman Scattering, Luminescence and Spectroscopic Instrumentation in Technology, (5 July 1989); https://doi.org/10.1117/12.951595

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