Download MendeleyA cyclic GMP-dependent signalling pathway regulates bacterial phytopathogenesis
An, S.Q., Chin, K.H., Febrer, M., McCarthy, Y., Yang, J.G., Liu, C.L., Swarbreck, D., Rogers, J., Maxwell Dow, J., Chou, S.-H., Ryan, R.P.(2013) EMBO J 32: 2430-2438
- PubMed: 23881098
- DOI: https://doi.org/10.1038/emboj.2013.165
- Primary Citation of Related Structures:
5H5O - PubMed Abstract:
Cyclic guanosine 3',5'-monophosphate (cyclic GMP) is a second messenger whose role in bacterial signalling is poorly understood. A genetic screen in the plant pathogen Xanthomonas campestris (Xcc) identified that XC_0250, which encodes a protein with a class III nucleotidyl cyclase domain, is required for cyclic GMP synthesis. Purified XC_0250 was active in cyclic GMP synthesis in vitro. The linked gene XC_0249 encodes a protein with a cyclic mononucleotide-binding (cNMP) domain and a GGDEF diguanylate cyclase domain. The activity of XC_0249 in cyclic di-GMP synthesis was enhanced by addition of cyclic GMP. The isolated cNMP domain of XC_0249 bound cyclic GMP and a structure-function analysis, directed by determination of the crystal structure of the holo-complex, demonstrated the site of cyclic GMP binding that modulates cyclic di-GMP synthesis. Mutation of either XC_0250 or XC_0249 led to a reduced virulence to plants and reduced biofilm formation in vitro. These findings describe a regulatory pathway in which cyclic GMP regulates virulence and biofilm formation through interaction with a novel effector that directly links cyclic GMP and cyclic di-GMP signalling.
Organizational Affiliation:
Division of Molecular Microbiology, College of Life Sciences, University of Dundee, Dundee, UK.
