The enzyme Malate Dehydrogenase (MD) catalyzes the conversion of malate to oxaloacetate using icotinamide adenine dinucleotide (NAD) as an enzyme cofactor (or coenzyme). Answer the following questions about this reaction. See pp. 462-467 of your textbook for further information. (a) Briefly explain how we know that this reaction (malate → oxaloacetate) is an oxidation- reduction reaction. (b) Write out the two reductive half reactions and indicate the e°' for each half reaction. Write out the full balanced reaction for the malate to oxaloacetate reaction and indicate the Aeº' for the reaction. (c) What is the free energy change under standard state conditions (AGº') for this reaction? Which direction is spontaneous?

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
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The enzyme Malate Dehydrogenase (MD) catalyzes the conversion of malate to oxaloacetate using nicotinamide adenine dinucleotide (NAD) as an enzyme cofactor (or coenzyme). Answer the following questions about this reaction. See pp. 462-467 of your textbook for further information.

(a) Briefly explain how we know that this reaction (malate → oxaloacetate) is an oxidation-reduction reaction.

(b) Write out the two reductive half reactions and indicate the ε°' for each half reaction. Write out the full balanced reaction for the malate to oxaloacetate reaction and indicate the Δε°' for the reaction.

(c) What is the free energy change under standard state conditions (ΔG°') for this reaction? Which direction is spontaneous?
Transcribed Image Text:The enzyme Malate Dehydrogenase (MD) catalyzes the conversion of malate to oxaloacetate using nicotinamide adenine dinucleotide (NAD) as an enzyme cofactor (or coenzyme). Answer the following questions about this reaction. See pp. 462-467 of your textbook for further information. (a) Briefly explain how we know that this reaction (malate → oxaloacetate) is an oxidation-reduction reaction. (b) Write out the two reductive half reactions and indicate the ε°' for each half reaction. Write out the full balanced reaction for the malate to oxaloacetate reaction and indicate the Δε°' for the reaction. (c) What is the free energy change under standard state conditions (ΔG°') for this reaction? Which direction is spontaneous?
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