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Stereoimage of the catalytic active site of PvdN. Residues that create a hydrogen-bonding network with the PLP cofactor are depicted. The electron density is calculated with coefficients of the form F o − F c generated prior to the inclusion of the cofactor in the active site and is contoured at 2.5σ. Positive density is present off the PLP O4 atom (denoted by an asterisk), suggesting an external aldimine.
