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Protoplasma

, Volume 255, Issue 4, pp 1015–1022 | Cite as

High-resolution suborganellar localization of Ca2+-binding protein CAS, a novel regulator of CO2-concentrating mechanism

  • Takashi Yamano
  • Chihana Toyokawa
  • Hideya FukuzawaEmail author
Original Article

Abstract

Many aquatic algae induce a CO2-concentrating mechanism (CCM) associated with active inorganic carbon transport to maintain high photosynthetic affinity using dissolved inorganic carbon even in low-CO2 (LC) conditions. In the green alga Chlamydomonas reinhardtii, a Ca2+-binding protein CAS was identified as a novel factor regulating the expression of CCM-related proteins including bicarbonate transporters. Although previous studies revealed that CAS associates with the thylakoid membrane and changes its localization in response to CO2 and light availability, its detailed localization in the chloroplast has not been examined in vivo. In this study, high-resolution fluorescence images of CAS fused with a Chlamydomonas-adapted fluorescence protein, Clover, were obtained by using a sensitive hybrid detector and an image deconvolution method. In high-CO2 (5% v/v) conditions, the fluorescence signals of Clover displayed a mesh-like structure in the chloroplast and part of the signals discontinuously overlapped with chlorophyll autofluorescence. The fluorescence signals gathered inside the pyrenoid as a distinct wheel-like structure at 2 h after transfer to LC-light condition, and then localized to the center of the pyrenoid at 12 h. These results suggest that CAS could move in the chloroplast along the thylakoid membrane in response to lowering CO2 and gather inside the pyrenoid during the operation of the CCM.

Keywords

Bicarbonate transporter Ca2+-binding protein Chlamydomonas CO2-concentrating mechanism Pyrenoid 

Notes

Acknowledgements

This work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grants 16H04805 (to H.F.) and 16K07399 (to T.Y.) and the Japan Science and Technology Agency Advanced Low Carbon Technology Research and Development Program (to H.F.).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  • Takashi Yamano
    • 1
  • Chihana Toyokawa
    • 1
  • Hideya Fukuzawa
    • 1
    Email author
  1. 1.Graduate School of BiostudiesKyoto UniversityKyotoJapan

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