Question

Single letter code for pyrrolysine is:

• A. \( \text{P} \)
• B. \( \text{J} \)
• C. \( \text{O} \)
• D. \( \text{Y} \)

Hint:

Pyrrolysine is one of the two non-standard amino acids incorporated into proteins naturally, alongside selenocysteine.

Answer 1

The Correct Option is C

Pyrrolysine is a rare amino acid found in some archaea and bacteria, encoded by the UAG stop codon in specific genetic contexts. Its single-letter code is "O", distinguishing it from other standard amino acids. It plays a role in enzymes that process methane and has unique structural characteristics.