Tryptophan Conversion to Aminocarboxymuconate Semialdehyde

The video explores the complex catabolic pathway of tryptophan, focusing on its conversion to 2-amino-3-carboxyl mucronate 6-semi-aldehyde. It highlights the stability of aromatic rings, particularly the indole ring in tryptophan, and the challenges in breaking them down. The pathway involves multiple steps, including the use of molecular oxygen and various enzymes, with a focus on the kynurenine pathway. The video also discusses the role of alanine in gluconeogenesis and the importance of compartmentalization in cellular processes.

What is the main challenge in catabolizing tryptophan?

• Its high reactivity

• Its solubility in water

• Its low energy state

• Its stable indole ring

What is the role of tryptophan 2-3 dioxygenase in tryptophan catabolism?

• It transports tryptophan

• It catalyzes the committed step

• It synthesizes tryptophan

• It stores tryptophan

Why are committed steps of amino acid metabolism located in the mitochondria?

• To increase reaction speed

• To separate catabolism from protein synthesis

• To store amino acids

• To enhance energy production

What happens to tryptophan once it is converted to informal kynurenine?

• It is used for protein synthesis

• It is committed to catabolism

• It is excreted from the body

• It is stored in the liver

What is the significance of serotonin in the body?

• It is a structural protein

• It is a hormone

• It is a neurotransmitter

• It is a digestive enzyme

What is the fate of alanine in the liver during fasting?

• It is used for protein synthesis

• It is stored as fat

• It is excreted as waste

• It is converted to glucose

What enzyme converts kynurenine to 3 hydroxy kynurenine?

• Kynurenine 3 monooxygenase

• Tryptophan synthase

• Alanine transaminase

• Kynurenine hydroxylase

What is the role of dioxygenases in tryptophan catabolism?

• To cleave aromatic rings

• To transport tryptophan

• To store tryptophan

• To synthesize tryptophan

What is the final product formed before entering alpha keto adipate catabolism?

• 2 amino, 3 carboxyl mucronate 6 semi aldehyde

• Kynurenine

• Serotonin

• 3 hydroxy anthranilate

What is the convergence point between tryptophan and lysine catabolism?

• Oxaloacetate

• Pyruvate

• Alpha keto adipate

• Alpha keto glutarate