Fig. 1

a Schematic diagram of the hrpB (XAC0293) gene in the X. citri subsp. citri strain 306 genome and the lengths of the open reading frames [29]. b Domain structure analyses of hrp B in Xanthomonas citri subsp. citri and E. coli. The domain structure predictions were performed using the Pfam protein families database. Domain symbols: DExDc, DEAD-like helicase superfamily; HELICc, Helicase superfamily c-terminal domain; HA2, Helicase-associated domain; and HrpB_c, ATP-dependent helicase C-terminal domain