A. 2-keto-3-deoxy-7-phospho-D-glucoheptonic acid
B. 3-dehydroshikimic acid
C. Shikimic acid
D. 3-dehydroquinic acid
Choose the correct answer from the options given below:
Shikimic Acid Pathway Sequence Identification
The Shikimic acid pathway is a crucial metabolic route for the biosynthesis of aromatic amino acids (phenylalanine, tyrosine, tryptophan) and many other secondary metabolites in plants, fungi, and bacteria. The question asks for the correct sequence of intermediates in this pathway, starting from the initial condensation product derived from Phosphoenolpyruvic acid (PEP) and Erythrose 4-phosphate (E4P).
Biogenetic Pathway Reactions Analysis
The biosynthesis begins with the condensation of PEP and E4P to form 2-keto-3-deoxy-arabino-heptulosonate 7-phosphate (DAHP). Based on the options provided, intermediate 'A' (2-keto-3-deoxy-7-phospho-D-glucoheptonic acid) represents this initial 7-carbon compound or a closely related structure.
The sequence proceeds through the following key steps:
- Step 1: Formation of 3-dehydroquinic acid (3-DHQ). DAHP undergoes cyclization and dehydration to form 3-dehydroquinic acid (Intermediate D).
- Step 2: Formation of 3-dehydroshikimic acid (3-DHS). 3-dehydroquinic acid is then dehydrated to yield 3-dehydroshikimic acid (Intermediate B).
- Step 3: Formation of Shikimic acid. Finally, 3-dehydroshikimic acid is reduced to produce Shikimic acid (Intermediate C).
Therefore, the correct sequence represented by the intermediates is A $\rightarrow$ D $\rightarrow$ B $\rightarrow$ C.
Correct Sequence Confirmation
Matching the derived sequence with the provided options:
- A: 2-keto-3-deoxy-7-phospho-D-glucoheptonic acid
- D: 3-dehydroquinic acid
- B: 3-dehydroshikimic acid
- C: Shikimic acid
The sequence A, D, B, C accurately reflects the progression of the biogenetic pathway reactions leading to Shikimic acid.
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