Urocanate Hydratase Mechanism

The video tutorial explores the catabolism of histidine, focusing on the enzyme urocanic hydratase. It explains the unique mechanism involving NAD and a carbon nucleophile, highlighting the rare sigmatropic rearrangement. The tutorial concludes with the addition reaction and the formation of imidazoline propionate, emphasizing the driving force of tautomerization due to enol instability.

Discuss the role of bases in the active site during the mechanism of urocanic hydratase.

What is the final product of the reaction catalyzed by urocanic hydratase?

What is the driving force behind the tautomerization of the enol form to the carbonyl form in this reaction?

How does the mechanism of urocanic hydratase illustrate the complexity of biochemical reactions?