Cited by 26Photosynthetic Processes and MechanismsPlant Stress Responses and ToleranceRedox biology and oxidative stress

Characterization of tryptophan oxidation affecting D1 degradation by FtsH in the photosystem II quality control of chloroplasts

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Kato, Yusuke, Kuroda, Hiroshi, Ozawa, Shin-Ichiro, Saito, Keisuke, Dogra, Vivek, Scholz, Martin, Zhang, Guoxian, de Vitry, Catherine +5 more·2023·eLife

Published version of a preprint

Abstract

Photosynthesis is one of the most important reactions for sustaining our environment. Photosystem II (PSII) is the initial site of photosynthetic electron transfer by water oxidation. Light in excess, however, causes the simultaneous production of reactive oxygen species (ROS), leading to photo-oxidative damage in PSII. To maintain photosynthetic activity, the PSII reaction center protein D1, which is the primary target of unavoidable photo-oxidative damage, is efficiently degraded by FtsH protease. In PSII subunits, photo-oxidative modifications of several amino acids such as Trp have been indeed documented, whereas the linkage between such modifications and D1 degradation remains elusive. Here, we show that an oxidative post-translational modification of Trp residue at the N-terminal tail of D1 is correlated with D1 degradation by FtsH during high-light stress. We revealed that Arabidopsis mutant lacking FtsH2 had increased levels of oxidative Trp residues in D1, among which an N-terminal Trp-14 was distinctively localized in the stromal side. Further characterization of Trp-14 using chloroplast transformation in Chlamydomonas indicated that substitution of D1 Trp-14 to Phe, mimicking Trp oxidation enhanced FtsH-mediated D1 degradation under high light, although the substitution did not affect protein stability and PSII activity. Molecular dynamics simulation of PSII implies that both Trp-14 oxidation and Phe substitution cause fluctuation of D1 N-terminal tail. Furthermore, Trp-14 to Phe modification appeared to have an additive effect in the interaction between FtsH and PSII core in vivo. Together, our results suggest that the Trp oxidation at its N-terminus of D1 may be one of the key oxidations in the PSII repair, leading to processive degradation by FtsH.

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Authors
Kato, Y., Kuroda, H., Ozawa, S.-I., Saito, K., Dogra, V., Scholz, M., Zhang, G., de Vitry, C., Ishikita, H., Kim, C., Hippler, M., Takahashi, Y., & Sakamoto, W.
Affiliations
  • Setsunan University (JP)
  • Okayama University (JP)
  • Research Center for Advanced Science and Technology, The University of Tokyo (JP)
  • Chinese Academy of Sciences (CN)
  • University of Münster (DE)
  • Institut de Biologie Physico-Chimique, Unité Mixte de Recherche 7141, Centre National de la Recherche Scientifique and Sorbonne Université Pierre et Marie Curie
Venue
eLife
Published
2023-11-21
Volume
12
ISSN
2050-084X (ISSN-L)
OpenAlex
W4388848710
Cited by
26
References
75
Citations by year
2026: 7 · 2025: 8 · 2024: 11
FWCI
2.31
Type
journal article
Language
en
Open access
Locations
eLife (publishedVersion, cc-by)
Funders
  • Ministry of Education, Culture, Sports, Science and Technology (KAKENHI (23H04959), KAKENHI (23H04963))
  • Japan Society for the Promotion of Science (KAKENHI (21H02508), KAKENHI (21K06221), KAKENHI (20H03217), KAKENHI (23H02444))
  • Oohara Foundation
  • Sorbonne Université (UMR7141)
  • Agence Nationale de la Recherche (ANR-11-LABX-0011-01)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Stress Responses and Tolerance
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
tryptophan oxidation, photosystem II, D1 protein degradation, FtsH protease, high light stress, photooxidative damage, N-terminal tail, post-translational modification, protein quality control, chloroplasts, Arabidopsis, Chlamydomonas, molecular dynamics simulation, protein stability

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