Nitric oxide regulation of cyclic di-GMP synthesis and hydrolysis in Shewanella woodyi

Biochemistry
Niu LiuElizabeth M Boon

Abstract

Although several reports have documented nitric oxide (NO) regulation of biofilm formation, the molecular basis of this phenomenon is unknown. In many bacteria, an H-NOX (heme-nitric oxide/oxygen-binding) gene is found near a diguanylate cyclase (DGC) gene. H-NOX domains are conserved hemoproteins that are known NO sensors. It is widely recognized that cyclic di-GMP (c-di-GMP) is a ubiquitous bacterial signaling molecule that regulates the transition between motility and biofilm. Therefore, NO may influence biofilm formation through H-NOX regulation of DGC, thus providing a molecular-level explanation for NO regulation of biofilm formation. This work demonstrates that, indeed, NO-bound H-NOX negatively affects biofilm formation by directly regulating c-di-GMP turnover in Shewanella woodyi strain MS32. Exposure of wild-type S. woodyi to a nanomolar level of NO resulted in the formation of thinner biofilms, and less intracellular c-di-GMP, than in the absence of NO. Also, a mutant strain in the gene encoding SwH-NOX showed a decreased level of biofilm formation (and a decreased amount of intracellular c-di-GMP) with no change observed upon NO addition. Furthermore, using purified proteins, it was demonstrated that SwH-NOX and SwD...Continue Reading

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