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Figure 5.
FIG. 5. Schematic diagram showing hydrogen bond and salt
bridge interactions of the active-site residues. Putative
interactions are shown by dotted lines if the acceptor and donor
are less than 3.5 Å apart. Phe-112 and Val-193, which
sandwich the pyridine ring of PLP, are omitted for clarity. A,
the unliganded ttGlnAT in the closed form. B, the ttGlnAT
complex with 3PP. The hydrogen bonds between Ser-13 and Asp-113
have been omitted for clarity.
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