The number of chiral carbon(s) present in peptide, Ile–Arg–Pro, is .

Question

The number of chiral carbon(s) present in peptide, Ile–Arg–Pro, is  .

Canvas Classes · Accepted Answer

Counting chiral carbons in Ile–Arg–Pro tripeptide:

Isoleucine (Ile):
- -carbon: chiral ✓
- -carbon (–CH(CH₃)–): chiral ✓ (Ile has 2 chiral centres — it's one of the two amino acids with 2 chiral centres)
- Total: 2 chiral carbons

Arginine (Arg):
- -carbon: chiral ✓
- Side chain (–CH₂–CH₂–CH₂–NH–C(=NH)–NH₂): no chiral centres in side chain
- Total: 1 chiral carbon

Proline (Pro):
- -carbon: chiral ✓ (the ring nitrogen is connected to the -carbon, making it chiral)
- The pyrrolidine ring: no add

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