Multiple choice

During the biosynthesis of penicillin, which amino acid is added first to alpha aminoadipic acid to obtain a beta-lactam ring?

  1. L-valine

  2. L-cysteine

  3. L-methionine

  4. L-isoleucine
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B Correct answer
Explanation

During the biosynthesis of penicillin, L-cysteine is added first to alpha-aminoadipic acid to obtain alpha-aminoadipic acid- L-cysteine complex, which in 3 stages yield beta-lactam ring.

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