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Active site at the ATP:FMN adenylyltransferase (FMNAT)-module of CaFADS (PDB code 2X0K), showing (a) details of the surface electrostatic potential and (b) position of relevant side chains (shown in sticks). Residues from the consensus 28-HxGH-31, 123-Gx(D/N)-125 and 161-xxSSTxxR-168 motifs are shown with carbons in violet, green and cyan, respectively. Both panels show the position of the PPi product (phosphates in orange) as observed in the crystal structure.
