Identify the numbered amino acids of the following antibacte

Identify the numbered amino acids of the following antibacterial cyclic peptide. Residue 9 is ornithine, an exotic amino acid.

3-letter abbreviations please.

HsN Ho N, 8 N- 10 HN H2N o NH2 O o no ou ou n o 5 ou ou NH 7 O

Solution

Residues 1, 3 and 4 are same.

Residues 5 and 6 are aspargine and glutamine with a difference of single carbon.

Residues 8 and 10 valine and leucine differ with a single carbon.