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Xanthomonas citri  subsp.  citri  ( Xcc ) is the major causal agent of citrus canker disease. The  XAC1347  gene, which encodes a conserved membrane protein in  Xcc , is required for virulence during infection. However, the molecular events mediated by  XAC1347  remain unclear. In this study, we reported that  XAC1347  gene is positively regulated by two component regulatory system  ColRS  and required for type III secretion system function. A non-polar deletion mutant of the  XAC1347  gene resulted in a Hrp minus phenotype in plants and reduced copper homeostasis. Real-time PCR experiments indicated that  XAC1347  gene is induced by copper ions. The expression levels of representative genes from four  hrp  operons, including  hrpB1, hrcV, hrpF , and  hrpD6 , were reduced in  XAC1347  mutant, indicating that  XAC1347  is involved  hrp  gene expression.

The ColRS-Regulated Membrane Protein Gene XAC1347 Is Involved in Copper Homeostasis and hrp Gene Expression in Xanthomonas citri subsp. citri