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The crossover technique can reveal the precise site of action of a respiratory-chain inhibitor. Britton Chance devised elegant spectroscopic methods for determining the proportions of the oxidized and reduced form of each carrier. This determination is feasible because the forms have distinctive absorption spectra, as illustrated in the graph for cytochrome c. Upon the addition of a new inhibitor to respiring mitochondria, the carriers between NADH and ubiquinol (QH2) become more reduced, and those between cytochrome c and O₂ become more oxidized. Where does your inhibitor act? Complex I Complex II Complex III Complex IV Absorbance coefficient (M-1 cm x 10-5) 10 1.0 0.5 400 Reduced Oxidized 500 Wavelength (nm) 600

The crossover technique can reveal the precise site of action of a respiratory-chain inhibitor. Britton Chance devised elegant spectroscopic methods for determining the proportions of the oxidized and reduced form of each carrier. This determination is feasible because the forms have distinctive absorption spectra, as illustrated in the graph for cytochrome c. Upon the addition of a new inhibitor to respiring mitochondria, the carriers between NADH and ubiquinol (QH2) become more reduced, and those between cytochrome c and O₂ become more oxidized. Where does your inhibitor act? Complex I Complex II Complex III Complex IV Absorbance coefficient (M-1 cm x 10-5) 10 1.0 0.5 400 Reduced Oxidized 500 Wavelength (nm) 600

Biochemistry
Biochemistry
6th Edition
ISBN:9781305577206
Author:Reginald H. Garrett, Charles M. Grisham
Publisher:Reginald H. Garrett, Charles M. Grisham
Chapter27: Metabolic Integration And Organ Specialization
Section: Chapter Questions
Problem 4P
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The crossover technique can reveal the precise site of action of a respiratory-chain inhibitor. Britton Chance devised elegant spectroscopic methods for determining the proportions of the oxidized and reduced form of each carrier. This determination is feasible because the forms have distinctive absorption spectra, as illustrated in the graph for cytochrome c. Upon the addition of a new inhibitor to respiring mitochondria, the carriers between NADH and ubiquinol (QH2) become more reduced, and those between cytochrome c and O₂ become more oxidized. Where does your inhibitor act? Complex I Complex II Complex III Complex IV Absorbance coefficient (M-1 cm x 10-5) 10 1.0 0.5 400 Reduced Oxidized 500 Wavelength (nm) 600
Transcribed Image Text:The crossover technique can reveal the precise site of action of a respiratory-chain inhibitor. Britton Chance devised elegant spectroscopic methods for determining the proportions of the oxidized and reduced form of each carrier. This determination is feasible because the forms have distinctive absorption spectra, as illustrated in the graph for cytochrome c. Upon the addition of a new inhibitor to respiring mitochondria, the carriers between NADH and ubiquinol (QH2) become more reduced, and those between cytochrome c and O₂ become more oxidized. Where does your inhibitor act? Complex I Complex II Complex III Complex IV Absorbance coefficient (M-1 cm x 10-5) 10 1.0 0.5 400 Reduced Oxidized 500 Wavelength (nm) 600
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