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. 2014 Jan 30;289(12):8620–8632. doi: 10.1074/jbc.M113.543033

SCHEME 3.

SCHEME 3.

HOD catalytic cycle. During the first step of QND oxygenation, the QND-OH proton is abstracted by His-251(Nϵ), with the contribution of Asp-126, which hydrogen bonded the His-251(Nδ). The deprotonated/activated substrate is later attacked by oxygen leading to N-acetyl-anthranilate (NAA) product formation.