L-Fucose, one of the eight essential monosaccharide?s, is biosynthesized from GDP-D-mannose by the following three-step reaction sequence,

Question:

L-Fucose, one of the eight essential monosaccharide?s, is biosynthesized from GDP-D-mannose by the following three-step reaction sequence, where (H)P?guano sine diphosphate (a ribonucleoside diphosphate; Section 28.1):

(a) Step 1 involves an oxidation to a ketone, a dehydration to an enone, and a conjugate reduction. The step requires NAD+, hut no NADPH Is formed as a final reaction product. Propose a mechanism.

(b) Step 2 accomplishes two epimerizations and utilizes acidic and basic sites in the enzyme hut does not require a coenzyme. Propose a mechanism.

(c) Step 3 requires NADPH as coenzyme. Show the mechanism.

image

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For  book-img-for-question
Question Posted: