By Mattias, Ph.D. Collin, Raymond, Ph.D. Schuch

Chemical interactions among organisms in microbial groups / Duan, okay. ... [et al.] -- Autoinducer-2-based chemical verbal exchange in micro organism: complexities of interspecies signaling / Federle, M.J. -- The molecular foundation of excitation and model in the course of chemotactic sensory transduction in micro organism / Rao, C.V., Ordal, G.W. -- Bacterial PEP-dependent carbohydrate: phosphotransferase structures couple sensing and worldwide keep an eye on mechanisms / Lengeler, J.W., Jahreis, K.-- Correlations among carbon metabolism and virulence in micro organism / Poncet, S. ... [et al.] -- Stand-alone reaction regulators controlling international virulence networks in streptococcus pyogenes / McIver, K.S. -- The heme sensor approach of staphylococcus aureus / Stauff, D.L., Skaar, E.P. -- Bacterial sensing of antimicrobial peptides / Otto, M. -- RNA thermosensors in bacterial pathogens / Johansson, J. -- triumphing thoughts of c-di-GMP signaling / Romling, U., Simm, R. -- Magnetosomes and magneto-aerotaxis / Frankel, R.B., Bazylinski, D.A. -- Engineering bacterial signs and sensors / Salis, H., Tamsir, A., Voigt, C

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Upon binding AI-2, LuxP undergoes large movements to close around the ligand. This movement reorients LuxP, making it possible to contact the LuxQpЈ subunit. This contact drives rotation between the two LuxQ subunits into an asymmetric position (fig. 4, right). This asymmetric orientation must signal to the cytoplasmic domains to switch kinase activity off. The phosphatase activity of LuxQ is located in the C-terminal aspartic acid (D1)-containing domain, and is not dependent on autoinducer concentration.

Mutans detects AI-2. Further complications due to signal redundancy also complicate these analyses. In fact, the species in which AI-2 was discovered, V. harveyi, does not have an obvious luxS phenotype. A V. harveyi luxS mutant decreases light production about 100-fold when grown to high cell density as compared to wild type [26]. However, a 100-fold loss in light output accounts for less than 1% of the overall change in light production observed when AI-1 and AI-2 autoinducers are removed simultaneously.

Harveyi’s LuxR protein directly activates transcription of luciferase and regulates nearly 100 other genes [6]. When V. harveyi reaches high cell density, HAI-1 concentrations are also high. When bound to autoinducer, the enzymatic activity of LuxN switches from kinase to phosphatase, and LuxN drains phosphate from LuxU and LuxO. Dephosphorylated LuxO is unable to activate transcription of sRNA genes, and consequently, LuxR expression is derepressed, and luciferase is expressed, and light is produced.

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