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Pentaglycine side-chain formation and peptidoglycan crosslinking. (Upper) Transpeptidase reaction crosslinking the fifth glycine residue of the acceptor muropeptide to the d-Ala of the donor stem peptide with release of the terminal d-Ala. Direct linkage to the ɛ-amino group of lysine does not occur in S. aureus. (Lower) Synthesis of the pentaglycine side chain at the membrane-bound lipid II intermediate.
