The acetyl group shuttle transfers the acetyl group of acetyl-CoA, produced by oxidative decarboxylation of pyruvate in the mitochondrion, to the cytosol. What is the overall equation for the transfer of one acetyl group from the mitochondrion to the cytosol? Acetyl-CoA (mit) + What is the cost of thi cost of shuttling an a ATP + CoA (cyt) CoA (cyt) 2 ATP +NADH + H+ NAD++ATP citrate + ATP acetyl-CoA (cyt) + roup? NADH + H+ +ADP + P; ADP + P + CoA (mit) + NAD+ CoA (mit) oxaloacetate + ADP + P₁ 2 ADP + 2 P₁ ATP(s)

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 acetyl group shuttle transfers the acetyl group of acetyl-CoA, produced by oxidative decarboxylation of pyruvate in the
mitochondrion, to the cytosol.
What is the overall equation for the transfer of one acetyl group from the mitochondrion to the cytosol?
Acetyl-CoA,
(mit)
+
What is the cost of thi
cost of shuttling an ad
ATP + CoA (cyt)
CoA (cyt) +NADH + H+
2 ATP
NAD+ +ATP
citrate + ATP
→
acetyl-CoA (cyt) +
roup?
NADH + H+ +ADP +P;
ADP + P + CoA (mit)
CoA (mit)
oxaloacetate + ADP + P₁
2 ADP + 2 P₁
+ NAD+
ATP(s)
Transcribed Image Text:The acetyl group shuttle transfers the acetyl group of acetyl-CoA, produced by oxidative decarboxylation of pyruvate in the mitochondrion, to the cytosol. What is the overall equation for the transfer of one acetyl group from the mitochondrion to the cytosol? Acetyl-CoA, (mit) + What is the cost of thi cost of shuttling an ad ATP + CoA (cyt) CoA (cyt) +NADH + H+ 2 ATP NAD+ +ATP citrate + ATP → acetyl-CoA (cyt) + roup? NADH + H+ +ADP +P; ADP + P + CoA (mit) CoA (mit) oxaloacetate + ADP + P₁ 2 ADP + 2 P₁ + NAD+ ATP(s)
What is the cost of this process in ATPs per acetyl group?
cost of shuttling an acetyl group:
ATP(s)
The acyl group shuttle transfers fatty acyl-CoA from the cytosol to the mitochondrion in preparation for ß oxidation, separating
the mitochondrial and cytosolic pools of CoA.
Does the acetyl group shuttle also keep mitochondrial and cytosolic pools of CoA separate?
Yes, because the shuttle requires the release of one mitochondrial CoA and the input of one cytosolic CoA.
Yes, because CoA formed in the mitochondrion remains in the mitochondrion, whereas CoA formed in the cytosol
remains in the cytosol.
No, because CoA can diffuse across the inner mitochondrial membrane.
No, because there is no cytosolic pool of CoA because CoA is formed in the mitochondrion.
Transcribed Image Text:What is the cost of this process in ATPs per acetyl group? cost of shuttling an acetyl group: ATP(s) The acyl group shuttle transfers fatty acyl-CoA from the cytosol to the mitochondrion in preparation for ß oxidation, separating the mitochondrial and cytosolic pools of CoA. Does the acetyl group shuttle also keep mitochondrial and cytosolic pools of CoA separate? Yes, because the shuttle requires the release of one mitochondrial CoA and the input of one cytosolic CoA. Yes, because CoA formed in the mitochondrion remains in the mitochondrion, whereas CoA formed in the cytosol remains in the cytosol. No, because CoA can diffuse across the inner mitochondrial membrane. No, because there is no cytosolic pool of CoA because CoA is formed in the mitochondrion.
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