Remember: Pyridoxal Phosphate (PLP) is the universal coenzyme for amino acid metabolism, including transamination, deamination, and decarboxylation reactions.
Step 1: Understanding the Concept:
Transaminases (aminotransferases) catalyze the transfer of an amino group from an amino acid to a keto acid, requiring an intermediate carrier to temporarily hold the amino group. Step 2: Detailed Explanation:
1. All transaminases require Pyridoxal Phosphate (PLP), which is the active coenzyme form of Vitamin \(\text{B}_6\).
2. PLP acts as a transient carrier of the amino group.
3. During the reaction, the amino group of an amino acid is transferred to PLP, converting it to pyridoxamine phosphate (PMP).
4. PLP is covalently bound to the active site of the enzyme through a Schiff base linkage with a specific lysine residue.
NADH, NADPH, and \(\text{FADH}_2\) are primarily involved as electron carriers in redox reactions. Step 3: Final Answer:
The correct option is 3, which corresponds to Pyridoxal phosphate.
