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(a) Superposition of the two Sts-1PGM monomers that populate the asymmetric unit in the present structure solved at pH 4.6. (b) Superposition of the A chains of Sts-1PGM solved at pH 6.5 (light gray; PDB code 2h0q) and at pH 4.6 (dark gray). The sulfate ion is shown in pink and the side chains of the catalytic His380 and His565 are shown in cyan in ball-and-stick representation to highlight the active site.
