Leu-enkephalin, a substance that binds to opioid receptors, consists of a – [Free] B101
Leu-enkephalin, a substance that binds to opioid receptors, consists of a peptide with the sequence YGGFL. Part 1 of 3 How many amide bonds join the amino acids in the peptide chain? Part 2 of 3 Give the name of the N -terminal amino acid. Part 3 of 3 Give the name of the C-terminal amino acid.
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Question:
Leu-enkephalin, a substance that binds to opioid receptors, consists of a peptide with the sequence YGGFL.
- How many amide bonds join the amino acids in the peptide chain?
- Give the name of the N-terminal amino acid.
- Give the name of the C-terminal amino acid.
Answer:
🔷 Peptide Sequence Breakdown
The peptide sequence is: Y-G-G-F-L
- Y = Tyrosine
- G = Glycine
- G = Glycine
- F = Phenylalanine
- L = Leucine
🔶 Number of Amide Bonds
A peptide with n amino acids contains n – 1 amide (peptide) bonds.
Since there are 5 amino acids in Leu-enkephalin, the number of amide bonds is:
5 − 1 = 4 amide bonds
🔸 N-terminal and C-terminal Amino Acids
- N-terminal amino acid: The first amino acid in the sequence is Tyrosine (Y).
- C-terminal amino acid: The last amino acid in the sequence is Leucine (L).
✅ Final Summary
- Number of amide bonds: 4
- N-terminal amino acid: Tyrosine
- C-terminal amino acid: Leucine