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Anoxygenic phototroph of the Chloroflexota uses a type I reaction centre.
Tsuji, J M; Shaw, N A; Nagashima, S; Venkiteswaran, J J; Schiff, S L; Watanabe, T; Fukui, M; Hanada, S; Tank, M; Neufeld, J D.
Afiliación
  • Tsuji JM; University of Waterloo, Waterloo, Ontario, Canada. jackson.tsuji@jamstec.go.jp.
  • Shaw NA; Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan. jackson.tsuji@jamstec.go.jp.
  • Nagashima S; Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan. jackson.tsuji@jamstec.go.jp.
  • Venkiteswaran JJ; University of Waterloo, Waterloo, Ontario, Canada.
  • Schiff SL; Tokyo Metropolitan University, Tokyo, Japan.
  • Watanabe T; Kanagawa University, Yokohama, Japan.
  • Fukui M; University of Waterloo, Waterloo, Ontario, Canada.
  • Hanada S; Wilfrid Laurier University, Waterloo, Ontario, Canada.
  • Tank M; University of Waterloo, Waterloo, Ontario, Canada.
  • Neufeld JD; Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan.
Nature ; 627(8005): 915-922, 2024 Mar.
Article en En | MEDLINE | ID: mdl-38480893
ABSTRACT
Scientific exploration of phototrophic bacteria over nearly 200 years has revealed large phylogenetic gaps between known phototrophic groups that limit understanding of how phototrophy evolved and diversified1,2. Here, through Boreal Shield lake water incubations, we cultivated an anoxygenic phototrophic bacterium from a previously unknown order within the Chloroflexota phylum that represents a highly novel transition form in the evolution of photosynthesis. Unlike all other known phototrophs, this bacterium uses a type I reaction centre (RCI) for light energy conversion yet belongs to the same bacterial phylum as organisms that use a type II reaction centre (RCII) for phototrophy. Using physiological, phylogenomic and environmental metatranscriptomic data, we demonstrate active RCI-utilizing metabolism by the strain alongside usage of chlorosomes3 and bacteriochlorophylls4 related to those of RCII-utilizing Chloroflexota members. Despite using different reaction centres, our phylogenomic data provide strong evidence that RCI-utilizing and RCII-utilizing Chloroflexia members inherited phototrophy from a most recent common phototrophic ancestor. The Chloroflexota phylum preserves an evolutionary record of the use of contrasting phototrophic modes among genetically related bacteria, giving new context for exploring the diversification of phototrophy on Earth.
Asunto(s)

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Bacterias / Complejo de Proteína del Fotosistema I / Procesos Fototróficos Idioma: En Revista: Nature Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Reino Unido

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Bacterias / Complejo de Proteína del Fotosistema I / Procesos Fototróficos Idioma: En Revista: Nature Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Reino Unido