Mechanisms for the three steps involved in the conversion of 3-phosphoglycerate into glyceraldehyde-3-phosphate, 1) Phosphorylation of 3-phosphoglycerate by treating with ATP to form 1,3- bisphosphoglycerate.2) Reaction of 1,3- bisphosphoglycerate with the thiol group on the enzyme to give an enzyme-bound thioester 3) Reduction of the enzyme bound thioester with NADH, are to be proposed. Concept introduction: All the three steps involved in the conversion of 3-phosphoglycerate into glyceraldehyde-3-phosphate take place through two steps i) Attack of a nucleophile on either P or C and ii) Elimination of the leaving group. To propose: Mechanisms for the three steps involved in the conversion of 3-phosphoglycerate into glyceraldehyde-3-phosphate 1) Phosphorylation of 3-phosphoglycerate by treating with ATP to form 1,3- bisphosphoglycerate 2) Reaction of 1,3- bisphosphoglycerate with the thiol group on the enzyme to give an enzyme-bound thioester 3) Reduction of the enzyme bound thioester with NADH.

Question

Proline betaine is a putative osmoprotectant in plants and bacteria, helping to prevent dehydration of cells. Coo- CH, CH, Propose a plausible pathway for biosynthesis of this compound.

Answer 1

Question

Chapter 21.SE, Problem 41MP

Interpretation Introduction

Interpretation:

Mechanisms for the three steps involved in the conversion of 3-phosphoglycerate into glyceraldehyde-3-phosphate, 1) Phosphorylation of 3-phosphoglycerate by treating with ATP to form 1,3- bisphosphoglycerate.2) Reaction of 1,3- bisphosphoglycerate with the thiol group on the enzyme to give an enzyme-bound thioester 3) Reduction of the enzyme bound thioester with NADH, are to be proposed.

Concept introduction:

All the three steps involved in the conversion of 3-phosphoglycerate into glyceraldehyde-3-phosphate take place through two steps i) Attack of a nucleophile on either P or C and ii) Elimination of the leaving group.

To propose:

Mechanisms for the three steps involved in the conversion of 3-phosphoglycerate into glyceraldehyde-3-phosphate 1) Phosphorylation of 3-phosphoglycerate by treating with ATP to form 1,3- bisphosphoglycerate 2) Reaction of 1,3- bisphosphoglycerate with the thiol group on the enzyme to give an enzyme-bound thioester 3) Reduction of the enzyme bound thioester with NADH.

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