Hopanoid lipids may facilitate aerobic nitrogen fixation in the ocean

3 pages, 1 figure

Detalles Bibliográficos
Autores: Cornejo-Castillo, Francisco M., Zehr, Jonathan P.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/415075
Acceso en línea:http://hdl.handle.net/10261/415075
Access Level:acceso abierto
Palabra clave:Oxygen diffusion barrier
Hopanoid lipids
Nitrogen fixation
Marine cyanobacteria
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spelling Hopanoid lipids may facilitate aerobic nitrogen fixation in the oceanCornejo-Castillo, Francisco M.Zehr, Jonathan P.Oxygen diffusion barrierHopanoid lipidsNitrogen fixationMarine cyanobacteria3 pages, 1 figureCyanobacterial diazotrophs are considered to be the most important source of fixed N2 in the open ocean. Biological N2 fixation is catalyzed by the extremely O2-sensitive nitrogenase enzyme. In cyanobacteria without specialized N2-fixing cells (heterocysts), mechanisms such as decoupling photosynthesis from N2 fixation in space or time are involved in protecting nitrogenase from the intracellular O2 evolved by photosynthesis. However, it is not known how cyanobacterial cells limit O2 diffusion across their membranes to protect nitrogenase in ambient O2-saturated surface ocean waters. Here, we explored all known genomes of the major marine cyanobacterial lineages for the presence of hopanoid synthesis genes, since hopanoids are a class of lipids that might act as an O2 diffusion barrier. We found that, whereas all non−heterocyst-forming cyanobacterial diazotrophs had hopanoid synthesis genes, none of the marine Synechococcus, Prochlorococcus (non−N2-fixing), and marine heterocyst-forming (N2-fixing) cyanobacteria did. Finally, we conclude that hopanoid-enriched membranes are a conserved trait in non−heterocyst-forming cyanobacterial diazotrophs that might lower the permeability to extracellular O2. This membrane property coupled with high respiration rates to decrease intracellular O2 concentration may therefore explain how non−heterocyst-forming cyanobacterial diazotrophs can fix N2 in the fully oxic surface oceanJ.P.Z. was supported by Simons Collaboration on Ocean Processes and Ecology (SCOPE, Grant 329108), Simons Foundation (Grant 545171), and Gordon and Betty Moore Foundation (Grant 493.01). F.M.C.-C. was supported by a Marie Curie Individual Global Fellowship - Horizon 2020 European Framework Programme (UCYN2PLAST, Grant 749380)Peer reviewedNational Academy of Sciences (U.S.)Simons FoundationGordon and Betty Moore FoundationEuropean Commission202620262019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/415075reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/H2020/749380https://doi.org/10.1073/pnas.1908165116Noinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4150752026-05-22T06:33:51Z
dc.title.none.fl_str_mv Hopanoid lipids may facilitate aerobic nitrogen fixation in the ocean
title Hopanoid lipids may facilitate aerobic nitrogen fixation in the ocean
spellingShingle Hopanoid lipids may facilitate aerobic nitrogen fixation in the ocean
Cornejo-Castillo, Francisco M.
Oxygen diffusion barrier
Hopanoid lipids
Nitrogen fixation
Marine cyanobacteria
title_short Hopanoid lipids may facilitate aerobic nitrogen fixation in the ocean
title_full Hopanoid lipids may facilitate aerobic nitrogen fixation in the ocean
title_fullStr Hopanoid lipids may facilitate aerobic nitrogen fixation in the ocean
title_full_unstemmed Hopanoid lipids may facilitate aerobic nitrogen fixation in the ocean
title_sort Hopanoid lipids may facilitate aerobic nitrogen fixation in the ocean
dc.creator.none.fl_str_mv Cornejo-Castillo, Francisco M.
Zehr, Jonathan P.
author Cornejo-Castillo, Francisco M.
author_facet Cornejo-Castillo, Francisco M.
Zehr, Jonathan P.
author_role author
author2 Zehr, Jonathan P.
author2_role author
dc.contributor.none.fl_str_mv Simons Foundation
Gordon and Betty Moore Foundation
European Commission
dc.subject.none.fl_str_mv Oxygen diffusion barrier
Hopanoid lipids
Nitrogen fixation
Marine cyanobacteria
topic Oxygen diffusion barrier
Hopanoid lipids
Nitrogen fixation
Marine cyanobacteria
description 3 pages, 1 figure
publishDate 2019
dc.date.none.fl_str_mv 2019
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/415075
url http://hdl.handle.net/10261/415075
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/H2020/749380
https://doi.org/10.1073/pnas.1908165116
No
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv National Academy of Sciences (U.S.)
publisher.none.fl_str_mv National Academy of Sciences (U.S.)
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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