Files in this Data Supplement:

• Supplemental file 1 - Fig. S1, location of residues essential for BglF activity; Fig. S2, identification of a conserved block around G106 of BglF; Fig. S3, comparison of the conserved block to a database of conserved blocks; Fig. S4, alignment of BglF homologues and chloride channel signature blocks; Fig. S5, location of mutations impairing β-glucoside recognition or transport in the B domain of BglF; Fig. S6, location of residues whose replacement suppressed defects in BglF phosphatase activity in the predicted structures of the BglG dimer
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