Schematic diagram of the gpsX (XAC3110) gene in the genome of X. citri subsp. citri strain 306. Open arrows indicate length, location and orientation of the ORFs. The triangle indicates the EZ-Tn5 insertion site in mutant 223 G4 (gpsX-). Gene colour represents operon membership. The middle element shows the 2299 bp PCR fragment cloned into the plasmid pUFR053 for complementation of the gpsX mutant 223 G4 (gpsX-). The lower element shows domain structure analyses of the putative GpsX protein. The domain structure prediction was performed using the SMART program program http://smart.embl-heidelberg.de/. Domain symbols: Glycos_transf_2: glycosyltransferase family 2 domain; SCOP:d1f6da_: UDP-Glycosyltransferase/glycogen phosphorylase superfamily.