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. 2011 Dec;75(4):636–663. doi: 10.1128/MMBR.00022-11

Fig. 5.

Fig. 5.

Reaction mechanisms of the LMM PBPs and d-Ala-d-Ala dipeptidases. (a) Two-step catalytic mechanism with the formation of an acyl enzyme intermediate and its attack by a water molecule. (b) Attack of the dipeptide carbonyl by a water molecule and formation of a bidentate complex with the catalytic Zn2+.