Can cytochrome a and a3 be put in complex I whereas cytochrome b and c1 are put in complex III? Explain.

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
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Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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The following table summarizes the standard redox potential of some components of
electron transport chain.Can cytochrome a and a3 be put in complex I whereas cytochrome b and c1 are put in
complex III? Explain. 

 

Standard Reduction Potentials of Respiratory Chain and Related Electron Carriers
Redox reaction (half-reaction)
2H+ + 2e
H₂
NAD+ + H+ + 2e¯
NADH
NADP+ + H+ + 2e¯ →→→→NADPH
NADH dehydrogenase (FMN) + 2H+ + 2e¯ NADH dehydrogenase (FMNH₂)
ubiquinol
Ubiquinone + 2H+ + 2e¯¯
Cytochrome b (Fe³+) + e¯
cytochrome b (Fe²+)
Cytochrome c₁ (Fe³+) + e
cytochrome c₁ (Fe²+)
Cytochrome c (Fe³+) + e
cytochrome c (Fe²+)
Cytochrome a (Fe³+) + e¯ →→→→cytochrome a (Fe²+)
Cytochrome a3 (Fe³+) + ¯→→→→→→ cytochrome a3 (Fe²+)
O₂ + 2H+ + 2e → → H₂O
E'° (V)
-0.414
-0.320
-0.324
-0.30
0.045
0.077
0.22
0.254
0.29
0.55
0.816
Transcribed Image Text:Standard Reduction Potentials of Respiratory Chain and Related Electron Carriers Redox reaction (half-reaction) 2H+ + 2e H₂ NAD+ + H+ + 2e¯ NADH NADP+ + H+ + 2e¯ →→→→NADPH NADH dehydrogenase (FMN) + 2H+ + 2e¯ NADH dehydrogenase (FMNH₂) ubiquinol Ubiquinone + 2H+ + 2e¯¯ Cytochrome b (Fe³+) + e¯ cytochrome b (Fe²+) Cytochrome c₁ (Fe³+) + e cytochrome c₁ (Fe²+) Cytochrome c (Fe³+) + e cytochrome c (Fe²+) Cytochrome a (Fe³+) + e¯ →→→→cytochrome a (Fe²+) Cytochrome a3 (Fe³+) + ¯→→→→→→ cytochrome a3 (Fe²+) O₂ + 2H+ + 2e → → H₂O E'° (V) -0.414 -0.320 -0.324 -0.30 0.045 0.077 0.22 0.254 0.29 0.55 0.816
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