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3D structures of some enzymes with a catalytic carboxyl group(s). Active-site residues are shown in stick representation. (a) RNase T1 carboxymethylated at Glu58 (PDB ID: 1DET). (b) Porcine pepsin A (PDB ID: 4PEP). (c) Aspergilloglutamic peptidase (PDB ID: 1Y43). (d) Sedolisin (PDB ID: 1GA4). (e) Hen egg-white lysozyme covalently bound with a substrate analog (PDB ID: 1H6M). NAG2FGlc, 2-acetamido-2-deoxy-β-d-glucopyranosyl-(1→4)-2-deoxy-2-fluoro-β-d-glucopyranosyl group.
