A New Hormonal Dialogue: How a Plant Signal Triggers Bacterial cAMP
Research published in the Journal of Bacteriology reveals a novel signaling pathway in the nitrogen-fixing bacterium Sinorhizobium meliloti. The study shows that cytokinin, a classic plant hormone, can be perceived by the bacterium independently of its typical CHASE-domain sensor kinases. This unconventional perception directly triggers the production of the second messenger 3′,5′-cyclic adenosine monophosphate (cAMP), a central regulator of bacterial gene expression and metabolism. This finding uncovers a previously unknown mechanism of host–microbe interaction, where a eukaryotic signal is co-opted to directly modulate prokaryotic intracellular signaling, potentially influencing symbiosis establishment.
Why it might matter to you: This work fundamentally expands the known mechanisms of host–microbe communication, moving beyond traditional receptor models. For microbiologists focused on pathogenesis or symbiosis, it suggests that pathogenic bacteria might similarly hijack host hormones to regulate virulence genes via conserved second messengers like cAMP. This insight could open new avenues for disrupting microbial signaling as an antimicrobial strategy, particularly against biofilm-forming or persistent infections where conventional treatments fail.
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