Cargando…

The cyanobacterium Prochlorococcus has divergent light-harvesting antennae and may have evolved in a low-oxygen ocean

Marine picocyanobacteria of the genus Prochlorococcus are the most abundant photosynthetic organisms in the modern ocean, where they exert a profound influence on elemental cycling and energy flow. The use of transmembrane chlorophyll complexes instead of phycobilisomes as light-harvesting antennae...

Descripción completa

Detalles Bibliográficos
Autores principales: Ulloa, Osvaldo, Henríquez-Castillo, Carlos, Ramírez-Flandes, Salvador, Plominsky, Alvaro M., Murillo, Alejandro A., Morgan-Lang, Connor, Hallam, Steven J., Stepanauskas, Ramunas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: National Academy of Sciences 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7980375/
https://www.ncbi.nlm.nih.gov/pubmed/33707213
http://dx.doi.org/10.1073/pnas.2025638118
_version_ 1783667433198845952
author Ulloa, Osvaldo
Henríquez-Castillo, Carlos
Ramírez-Flandes, Salvador
Plominsky, Alvaro M.
Murillo, Alejandro A.
Morgan-Lang, Connor
Hallam, Steven J.
Stepanauskas, Ramunas
author_facet Ulloa, Osvaldo
Henríquez-Castillo, Carlos
Ramírez-Flandes, Salvador
Plominsky, Alvaro M.
Murillo, Alejandro A.
Morgan-Lang, Connor
Hallam, Steven J.
Stepanauskas, Ramunas
author_sort Ulloa, Osvaldo
collection PubMed
description Marine picocyanobacteria of the genus Prochlorococcus are the most abundant photosynthetic organisms in the modern ocean, where they exert a profound influence on elemental cycling and energy flow. The use of transmembrane chlorophyll complexes instead of phycobilisomes as light-harvesting antennae is considered a defining attribute of Prochlorococcus. Its ecology and evolution are understood in terms of light, temperature, and nutrients. Here, we report single-cell genomic information on previously uncharacterized phylogenetic lineages of this genus from nutrient-rich anoxic waters of the eastern tropical North and South Pacific Ocean. The most basal lineages exhibit optical and genotypic properties of phycobilisome-containing cyanobacteria, indicating that the characteristic light-harvesting antenna of the group is not an ancestral attribute. Additionally, we found that all the indigenous lineages analyzed encode genes for pigment biosynthesis under oxygen-limited conditions, a trait shared with other freshwater and coastal marine cyanobacteria. Our findings thus suggest that Prochlorococcus diverged from other cyanobacteria under low-oxygen conditions before transitioning from phycobilisomes to transmembrane chlorophyll complexes and may have contributed to the oxidation of the ancient ocean.
format Online
Article
Text
id pubmed-7980375
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher National Academy of Sciences
record_format MEDLINE/PubMed
spelling pubmed-79803752021-03-26 The cyanobacterium Prochlorococcus has divergent light-harvesting antennae and may have evolved in a low-oxygen ocean Ulloa, Osvaldo Henríquez-Castillo, Carlos Ramírez-Flandes, Salvador Plominsky, Alvaro M. Murillo, Alejandro A. Morgan-Lang, Connor Hallam, Steven J. Stepanauskas, Ramunas Proc Natl Acad Sci U S A Biological Sciences Marine picocyanobacteria of the genus Prochlorococcus are the most abundant photosynthetic organisms in the modern ocean, where they exert a profound influence on elemental cycling and energy flow. The use of transmembrane chlorophyll complexes instead of phycobilisomes as light-harvesting antennae is considered a defining attribute of Prochlorococcus. Its ecology and evolution are understood in terms of light, temperature, and nutrients. Here, we report single-cell genomic information on previously uncharacterized phylogenetic lineages of this genus from nutrient-rich anoxic waters of the eastern tropical North and South Pacific Ocean. The most basal lineages exhibit optical and genotypic properties of phycobilisome-containing cyanobacteria, indicating that the characteristic light-harvesting antenna of the group is not an ancestral attribute. Additionally, we found that all the indigenous lineages analyzed encode genes for pigment biosynthesis under oxygen-limited conditions, a trait shared with other freshwater and coastal marine cyanobacteria. Our findings thus suggest that Prochlorococcus diverged from other cyanobacteria under low-oxygen conditions before transitioning from phycobilisomes to transmembrane chlorophyll complexes and may have contributed to the oxidation of the ancient ocean. National Academy of Sciences 2021-03-16 2021-03-11 /pmc/articles/PMC7980375/ /pubmed/33707213 http://dx.doi.org/10.1073/pnas.2025638118 Text en Copyright © 2021 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/ https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) .
spellingShingle Biological Sciences
Ulloa, Osvaldo
Henríquez-Castillo, Carlos
Ramírez-Flandes, Salvador
Plominsky, Alvaro M.
Murillo, Alejandro A.
Morgan-Lang, Connor
Hallam, Steven J.
Stepanauskas, Ramunas
The cyanobacterium Prochlorococcus has divergent light-harvesting antennae and may have evolved in a low-oxygen ocean
title The cyanobacterium Prochlorococcus has divergent light-harvesting antennae and may have evolved in a low-oxygen ocean
title_full The cyanobacterium Prochlorococcus has divergent light-harvesting antennae and may have evolved in a low-oxygen ocean
title_fullStr The cyanobacterium Prochlorococcus has divergent light-harvesting antennae and may have evolved in a low-oxygen ocean
title_full_unstemmed The cyanobacterium Prochlorococcus has divergent light-harvesting antennae and may have evolved in a low-oxygen ocean
title_short The cyanobacterium Prochlorococcus has divergent light-harvesting antennae and may have evolved in a low-oxygen ocean
title_sort cyanobacterium prochlorococcus has divergent light-harvesting antennae and may have evolved in a low-oxygen ocean
topic Biological Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7980375/
https://www.ncbi.nlm.nih.gov/pubmed/33707213
http://dx.doi.org/10.1073/pnas.2025638118
work_keys_str_mv AT ulloaosvaldo thecyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT henriquezcastillocarlos thecyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT ramirezflandessalvador thecyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT plominskyalvarom thecyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT murilloalejandroa thecyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT morganlangconnor thecyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT hallamstevenj thecyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT stepanauskasramunas thecyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT ulloaosvaldo cyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT henriquezcastillocarlos cyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT ramirezflandessalvador cyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT plominskyalvarom cyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT murilloalejandroa cyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT morganlangconnor cyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT hallamstevenj cyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean
AT stepanauskasramunas cyanobacteriumprochlorococcushasdivergentlightharvestingantennaeandmayhaveevolvedinalowoxygenocean