The Chemistry of Microbiomes Proceedings of a Seminar Series (2017) / Chapter Skim
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11 Talking with Molecules: Marine Bacteria and Microalgae - Mohammad R. Seyedsayamdost
11 Talking with Molecules: Marine Bacteria and Microalgae - Mohammad R. Seyedsayamdost
Pages 77-84
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From page 77... ...
Because of the sheer size of these blooms, which can cover areas as large as 3×105 km2, E huxleyi significantly contributes to global biogeochemical cycles, for example, by generating O2 during photosynthesis or synthesizing large amounts of the climatically active nutrient dimethylsulfoniopropionate (DMSP)
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From page 78... ...
In return, Phaeobacter inhibens, a representative roseobacter, produces auxin phenylacetic acid, which promotes algal growth and health, and the antibiotic tropodithietic acid (TDA) , which protects the microalgal–bacterial assembly from unwanted marine pathogens (Brinkhoff et al., 2004; Thiel et al., 2010; Seyedsayamdost et al., 2011b; Wilson et al., 2016; see Figure 11-1, green arrows)
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From page 79... ...
. Because different phenylpropanoids are produced by varying algal hosts, we examined the effect of sinapic acid, ferulic acid, cinnamic acid, and caffeic acid on RSB production in P
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From page 80... ...
With the RSB biosynthetic genes identified, we can now provide an answer regarding the underlying molecular framework that enables the observed metabolic economy, which is the ability to repurpose beneficial molecules to generate RSBs (see Figure 11-1)
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From page 81... ...
These experiments show that RSB synthesis is QS regulated; a sufficient quorum and signal pCA must be present for the bacteria to initiate a lifestyle switch. The requirement of two signals for induction of RSB synthesis in part explains the tight regulation of this process and why no RSBs are observed under numerous conditions examined that lack pCA (Seyedsayamdost et al., 2011b)
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From page 82... ...
. A major consequence of the use of small molecules as a chemical language is that the study of symbiotic interactions necessitates biological and chemical methods.
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From page 83... ...
Lifestyle switches in other symbioses may also involve repurposed metabolites and hybrid biosynthetic pathways. We can draw parallels with the plant Rhodopseudomonas palustris interaction, where this kind of phenomenon has been observed (Schaefer et al., 2008)
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From page 84... ...
2007. Dynorphin activates quorum sensing quinolone signaling in Pseudomonas aeruginosa.
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