If H218O is used in the hydrolysis reaction catalyzed by lysozyme, which ring will contain the label, NAM or NAG?

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If H218O is used in the hydrolysis reaction catalyzed by lysozyme, which ring will contain the label, NAM or NAG?

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Lysozyme here is a glycoside hydrolase. This can damage the bacterial  cell walls by catalyzing the hydrolysis of 1,4-beta-linkages b/w N-acetylmuramic acid and N-acetyl-D-glucosamine residue in a peptidoglycan.

During the hydrolysis of lysozyme NAM is the ring that undergoes nucleophilic attack by the radioactively-labeled water molecule.

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