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Stand Genomic Sci. 2018 May 9;13:14. doi: 10.1186/s40793-018-0317-z. eCollection 2018.

Complete genome sequence of "Thiodictyon syntrophicum" sp. nov. strain Cad16T, a photolithoautotrophic purple sulfur bacterium isolated from the alpine meromictic Lake Cadagno.

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1University of Geneva, Sciences III, Department of Botany and Plant Biology, Microbiology Unit, 1211 Geneva, Switzerland.
University of Applied Sciences of Southern Switzerland (SUPSI), Department of Environment, Constructions and Design (DACD), Laboratory of Applied Microbiology (LMA), Via Mirasole 22A, 6500 Bellinzona, Switzerland.
3Federal Office for Civil Protection, Spiez Laboratory, Biology Division, Spiez, Switzerland.
4Zurich University of Applied Sciences (ZHAW), Institute of Natural Resource Sciences, Environmental Genomics and System Biology Research Group, Wädenswil, Switzerland.
5University of Copenhagen, Department of Biology, Helsingør, Denmark.


"Thiodictyon syntrophicum" sp. nov. strain Cad16T is a photoautotrophic purple sulfur bacterium belonging to the family of Chromatiaceae in the class of Gammaproteobacteria. The type strain Cad16T was isolated from the chemocline of the alpine meromictic Lake Cadagno in Switzerland. Strain Cad16T represents a key species within this sulfur-driven bacterial ecosystem with respect to carbon fixation. The 7.74-Mbp genome of strain Cad16T has been sequenced and annotated. It encodes 6237 predicted protein sequences and 59 RNA sequences. Phylogenetic comparison based on 16S rRNA revealed that Thiodictyon elegans strain DSM 232T the most closely related species. Genes involved in sulfur oxidation, central carbon metabolism and transmembrane transport were found. Noteworthy, clusters of genes encoding the photosynthetic machinery and pigment biosynthesis are found on the 0.48 Mb plasmid pTs485. We provide a detailed insight into the Cad16T genome and analyze it in the context of the microbial ecosystem of Lake Cadagno.


CRISPR; Chromatiaceae; Meromictic lake; Okenone; Phototrophic sulfur bacteria; Sulfur cycling

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