Phase I Enzymes: Beyond CYP450
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Questions and Answers

What is the primary function of Flavin Monooxygenase (FMO) in Phase I biotransformation?

  • Reduction of xenobiotics
  • N,S oxidation to give N-oxides and sulfoxides (correct)
  • Hydrolysis of lipophilic drugs
  • Conjugation of Phase I metabolites

What is the reactive oxidant in the reaction catalyzed by Flavin Monooxygenase (FMO)?

  • NADPH
  • Oxygen
  • Flavin hydroperoxide (correct)
  • NAD+

Which enzyme is responsible for the oxidation of aldehydes to carboxylic acids?

  • Esterases
  • Flavin Monooxygenase (FMO)
  • Aldehyde Dehydrogenase (ALDH) (correct)
  • Alcohol Dehydrogenase (ADH)

What is the substrate characteristic of Alcohol Dehydrogenase (ADH) isoforms?

<p>Similar to xenobiotic metabolism enzymes (D)</p> Signup and view all the answers

What is the result of a genetic defect in Flavin Monooxygenase (FMO) in humans?

<p>Trimethylaminuria (B)</p> Signup and view all the answers

What is the role of Aldehyde Dehydrogenase (ALDH) in the metabolism of Hydroxyzine?

<p>Oxidation of the aldehyde to the carboxylic acid (B)</p> Signup and view all the answers

What is the result of lipid oxidation in the body?

<p>Formation of 4-hydroxynonenal (A)</p> Signup and view all the answers

Which enzyme is responsible for the majority of ethanol metabolism in humans?

<p>Alcohol dehydrogenase (C)</p> Signup and view all the answers

What is the result of being homozygous for the ALDH2*2 allele?

<p>Decreased overall ALDH activity (D)</p> Signup and view all the answers

What is the byproduct of ethanol metabolism that is then oxidized by aldehyde dehydrogenases?

<p>Acetaldehyde (B)</p> Signup and view all the answers

What is the mechanism of aldehyde dehydrogenase action?

<p>Attack of a conserved cysteine thiolate on the aldehyde (A)</p> Signup and view all the answers

What is the result of acetaldehyde accumulation in the body?

<p>Increased risk of cardiovascular diseases (A)</p> Signup and view all the answers

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