Abstract
Chlorophototrophs are organisms that can synthesize chlorophylls or bacteriochlorophylls, and they use these molecules to harvest and convert light energy into stored chemical potential energy. Some of these organisms also perform photosynthesis, in which light provides the energy (ATP) and reducing power (NAD(P)H or reduced ferredoxin) required for inorganic carbon (Ci) fixation. Over the past decade, we have studied the chlorophototrophs found in two alkaline siliceous hot springs in Yellowstone National Park, WY, USA. The microbial mats that occur at temperatures of 40–73 °C in Mushroom and Octopus Springs have proven to contain a surprisingly diverse array of chlorophototrophs. These include members of six of the seven bacterial phyla known to have members capable of synthesizing (bacterio)-chlorophylls: Acidobacteria, Cyanobacteria, Chlorobi, Chloroflexi, Firmicutes, and Proteobacteria. More than 16 chlorophototrophs have now been associated with these microbial mats, and this does not include the many ecotypes of these organisms that occur within these communities. In this chapter we will briefly describe the panoply of phototrophic organisms that occur in these mat communities and will provide an introduction to their morphological appearance and other basic properties. Metagenomic analyses have revealed several novel organisms, e.g., Chloracidobacterium thermophilum, “Candidatus Thermochlorobacter aerophilum,” “Candidatus Chloranaerofilum corporosum,” “Candidatus Roseovibrio tepidum,” and “Candidatus Roseilinea gracile,” which were hitherto unknown to microbiologists because they escaped isolation by classical, culture-based methods. However, by combining molecular methods, in situ physiological observations, metabolic reconstruction, and enrichment techniques, we are now making remarkable progress toward the isolation of these chlorophototrophic organisms.
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Acknowledgements
The studies described in this chapter were partly funded by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the Department of Energy through Grant DE-FG02-94ER20137. D. A. B. and D. M. W. additionally acknowledge support from the NASA Exobiology program (NX09AM87G). This work was also partly supported by the US Department of Energy (DOE), Office of Biological and Environmental Research (BER), as part of BER’s Genomic Science Program 395 (GSP). This contribution originates from the GSP Foundational Scientific Focus Area (FSFA) at the Pacific Northwest National Laboratory (PNNL) under a subcontract to D.A.B. Some of the nucleotide sequencing was performed as part of a Community Sequencing Program (Project CSP-411) and was performed by the US Department of Energy Joint Genome Institute, which is supported by the Office of Science of the US Department of Energy under Contract No. DE-AC02-05CH11231.
The authors would also like to thank all of the JGI staff members who contributed to obtaining the sequence data. The materials used in this study were collected under permit #YELL-SCI-0129 held by D. M. W. and administered under the authority of Yellowstone National Park. The authors especially thank Christie Hendrix and Stacey Gunther for their advice and assistance.
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Tank, M., Thiel, V., Ward, D.M., Bryant, D.A. (2017). A Panoply of Phototrophs: An Overview of the Thermophilic Chlorophototrophs of the Microbial Mats of Alkaline Siliceous Hot Springs in Yellowstone National Park, WY, USA. In: Hallenbeck, P. (eds) Modern Topics in the Phototrophic Prokaryotes. Springer, Cham. https://doi.org/10.1007/978-3-319-46261-5_3
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