IDEAS home Printed from https://ideas.repec.org/a/nat/natcom/v4y2013i1d10.1038_ncomms2689.html
   My bibliography  Save this article

A light-driven sodium ion pump in marine bacteria

Author

Listed:
  • Keiichi Inoue

    (Nagoya Institute of Technology
    PRESTO, Japan Science and Technology Agency)

  • Hikaru Ono

    (Nagoya Institute of Technology)

  • Rei Abe-Yoshizumi

    (Nagoya Institute of Technology)

  • Susumu Yoshizawa

    (Atmosphere and Ocean Research Institute, The University of Tokyo)

  • Hiroyasu Ito

    (Nagoya Institute of Technology)

  • Kazuhiro Kogure

    (Atmosphere and Ocean Research Institute, The University of Tokyo)

  • Hideki Kandori

    (Nagoya Institute of Technology)

Abstract

Light-driven proton-pumping rhodopsins are widely distributed in many microorganisms. They convert sunlight energy into proton gradients that serve as energy source of the cell. Here we report a new functional class of a microbial rhodopsin, a light-driven sodium ion pump. We discover that the marine flavobacterium Krokinobacter eikastus possesses two rhodopsins, the first, KR1, being a prototypical proton pump, while the second, KR2, pumps sodium ions outward. Rhodopsin KR2 can also pump lithium ions, but converts to a proton pump when presented with potassium chloride or salts of larger cations. These data indicate that KR2 is a compatible sodium ion–proton pump, and spectroscopic analysis showed it binds sodium ions in its extracellular domain. These findings suggest that light-driven sodium pumps may be as important in situ as their proton-pumping counterparts.

Suggested Citation

  • Keiichi Inoue & Hikaru Ono & Rei Abe-Yoshizumi & Susumu Yoshizawa & Hiroyasu Ito & Kazuhiro Kogure & Hideki Kandori, 2013. "A light-driven sodium ion pump in marine bacteria," Nature Communications, Nature, vol. 4(1), pages 1-10, June.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2689
    DOI: 10.1038/ncomms2689
    as

    Download full text from publisher

    File URL: https://www.nature.com/articles/ncomms2689
    File Function: Abstract
    Download Restriction: no
    File URL: https://libkey.io/10.1038/ncomms2689?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Chao Li & Yi Zhai & Heming Jiang & Siqi Li & Pengxiang Liu & Longcheng Gao & Lei Jiang, 2024. "Bioinspired light-driven chloride pump with helical porphyrin channels," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. E. Podoliak & G. H. U. Lamm & E. Marin & A. V. Schellbach & D. A. Fedotov & A. Stetsenko & M. Asido & N. Maliar & G. Bourenkov & T. Balandin & C. Baeken & R. Astashkin & T. R. Schneider & A. Bateman &, 2024. "A subgroup of light-driven sodium pumps with an additional Schiff base counterion," Nature Communications, Nature, vol. 15(1), pages 1-16, December.

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2689. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Sonal Shukla or Springer Nature Abstracting and Indexing (email available below). General contact details of provider: http://www.nature.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.