Yeast alcohol dehydrogenase catalyzes the reduction of acetaldehyde by NADH to ethanol in the last step of
Question:
Yeast alcohol dehydrogenase catalyzes the reduction of acetaldehyde by NADH to ethanol in the last step of anaerobic fermentation.
(a) The structure of this enzyme shows a Zn2+ ion (held in place by coordination with several amino acid side chains of the enzyme) that is required for catalysis near the carbonyl of acetaldehyde. Propose a role for this metal ion in catalysis.
(b) Using your answer to part (a), draw a curved-arrow mechanism for this reduction in which the role of the Zn2+ ion is explicitly shown.
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a b The zinc ion acts as a Lewis acid catalyst by bonding to the c...View the full answer
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