Skip to main content
Log in

Exciton quenching by oxidized chlorophyll Z across the two adjacent monomers in a photosystem II core dimer

  • Original article
  • Published:
Photosynthesis Research Aims and scope Submit manuscript

Abstract

This study aimed to clarify (1) which pigment in a photosystem II (PSII) core complex is responsible for the 695-nm emission at 77 K and (2) the molecular basis for the oxidation-induced fluorescence quenching in PSII. Picosecond time-resolved fluorescence dynamics was compared between the dimeric and monomeric PSII with and without addition of an oxidant. The results indicated that the excitation-energy flow to the 695-nm-emitting chlorophyll (Chl) at 36 K and 77 K was hindered upon monomerization, clearly demonstrating significant exciton migration from the Chls on one monomer to the 695-nm-emitting pigment on the adjacent monomer. Oxidation of the redox-active Chl, which is named ChlZ caused almost equal quenching of the 684-nm and 695-nm emission bands in the dimer, and lower quenching of the 695-nm band in the monomer. These results suggested two possible scenarios responsible for the 695-nm emission band: (A) Chl11-13 pair and the oxidized ChlZD1 work as the 695-nm emitting Chl and the quenching site, respectively, and (B) Chl29 and the oxidized ChlZD2 work as the 695-nm emitting Chl and the quenching site, respectively.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6

Similar content being viewed by others

References

Download references

Acknowledgements

This work was supported in part by JSPS KAKENHI Grant Number JP15H04356 to Y.S., 20K06684 to S.I., and JP22H04916 to J.-R. S.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Yutaka Shibata.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary Information

Below is the link to the electronic supplementary material.

Supplementary file1 (PDF 1154 kb)

Rights and permissions

Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Mohamed, A., Nishi, S., Kawakami, K. et al. Exciton quenching by oxidized chlorophyll Z across the two adjacent monomers in a photosystem II core dimer. Photosynth Res 154, 277–289 (2022). https://doi.org/10.1007/s11120-022-00948-1

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11120-022-00948-1

Keywords

Navigation