期刊
EMBO JOURNAL
卷 39, 期 6, 页码 -出版社
WILEY
DOI: 10.15252/embj.2019103412
关键词
biofilm formation; crystal structure; phosphorylation; protein-protein interaction; Pseudomonas aeruginosa
资金
- National Natural Science Foundation of China [31622003, 31670080, 31870060, 31700064]
- Natural Science Basic Research Program of Shaanxi [2019JQ-134]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1174, ITR_15R55]
Bacterial cyclic-di-GMP (c-di-GMP) production is associated with biofilm development and the switch from acute to chronic infections. In Pseudomonas aeruginosa, the diguanylate cyclase (DGC) SiaD and phosphatase SiaA, which are co-transcribed as part of a siaABCD operon, are essential for cellular aggregation. However, the detailed functions of this operon and the relationships among its constituent genes are unknown. Here, we demonstrate that the siaABCD operon encodes for a signaling network that regulates SiaD enzymatic activity to control biofilm and aggregates formation. Through protein-protein interaction, SiaC promotes SiaD diguanylate cyclase activity. Biochemical and structural data revealed that SiaB is an unusual protein kinase that phosphorylates SiaC, whereas SiaA phosphatase can dephosphorylate SiaC. The phosphorylation state of SiaC is critical for its interaction with SiaD, which will switch on or off the DGC activity of SiaD and regulate c-di-GMP levels and subsequent virulence phenotypes. Collectively, our data provide insights into the molecular mechanisms underlying the modulation of DGC activity associated with chronic infections, which may facilitate the development of antimicrobial drugs.
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