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The rapid spread and aggressive progression of huanglongbing (HLB) in the major citrus-producing areas have raised global recognition of and vigilance to this disease. As a result, the causative agent,Liberibacter asiaticus , has been investigated from various perspectives. However, gene expression regulatory mechanisms that are important for the survival and persistence of this intracellular pathogen remain largely unexplored. PrbP is a transcriptional accessory protein important forL. asiaticus survival in the plant host. In this study, we investigated the interactions between PrbP inL. asiaticus (PrbPLas ) and a ferredoxin-like protein (FerR) inL. asiaticus , FerRLas . We show that the presence of FerR stabilizes and augments the activity of PrbPLas . In addition, we demonstrate that the expression offerR is induced by increases in osmolarity inLiberibacter crescens . Altogether, these results suggest that FerRLas and PrbPLas may play important roles in the regulation of gene expression in response to changing environmental signals duringL. asiaticus infection in the citrus host.

The Ferredoxin-Like Protein FerR Regulates PrbP Activity in Liberibacter asiaticus