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Model of Pla structure (23) and location of residue Thr259. Side (top drawing) and top (bottom drawing) views of the transmembrane β-barrel are shown. L1 to L5 are the surface loops. Catalytic residues Asp84, Asp86, Asp206, and His208 are indicated in green, Thr259 is in red, and the autoprocessing site Lys262 is in yellow. OM is the outer membrane. (C) Amino acid sequence of residues 254 to 273 at L5 and the termini of β-strands 9 and 10 in Pla, Microtus Pla, and PgtE are shown.
