Quality control of photosystem II

Direct imaging of the changes in the thylakoid structure and distribution of FtsH proteases in spinach chloroplasts under light stress

Miho Nishimura, Daisuke Nanba, Takashi Takaki, Chikako Ohba, Nodoka Tsumura, Noriko Morita, Hirotaka Sakamoto, Kazuyoshi Murata, Yasusi Yamamoto

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Under light stress, the reaction center-binding protein D1 of PSII is photo-oxidatively damaged and removed from PSII complexes by proteases located in the chloroplast. A protease considered to be responsible for degradation of the damaged D1 protein is the metalloprotease FtsH. We showed previously that the active hexameric FtsH protease is abundant at the grana margin and the grana end membranes, and this homo-complex removes the photodamaged D1 protein in the grana. Here, we showed a change in the distribution of FtsH in spinach thylakoids during excessive illumination by transmission electron microscopy (TEM) and immunogold labeling of FtsH. The change in distribution of the protease was accompanied by structural changes to the thylakoids, which we detected using spinach leaves by TEM after chemical fixation of the samples. Quantitative analyses showed several characteristic changes in the structure of the thylakoids, including shrinkage of the grana, outward bending of the marginal portions of the thylakoids and an increase in the height of the grana stacks under excessive illumination. The increase in the height of the grana stacks may include swelling of the thylakoids and an increase in the partition gaps between the thylakoids. These data strongly suggest that excessive illumination induces partial unstacking of the thylakoids, which enables FtsH to access easily the photodamaged D1 protein. Finally three-dimensional tomography of the grana was recorded to observe the effect of light stress on the overall structure of the thylakoids.

Original languageEnglish
Pages (from-to)1255-1265
Number of pages11
JournalPlant and Cell Physiology
Volume55
Issue number7
DOIs
Publication statusPublished - 2014

Fingerprint

Thylakoids
Photosystem II Protein Complex
Spinacia oleracea
grana
Chloroplasts
spinach
thylakoids
Quality Control
photosystem II
quality control
Peptide Hydrolases
proteinases
chloroplasts
image analysis
Light
D1 protein
lighting
transmission electron microscopy
Lighting
tomography

Keywords

  • FtsH protease
  • Light stress
  • Photosystem II
  • Spinach chloroplast
  • TEM
  • Thylakoid

ASJC Scopus subject areas

  • Plant Science
  • Physiology
  • Cell Biology
  • Medicine(all)

Cite this

Quality control of photosystem II : Direct imaging of the changes in the thylakoid structure and distribution of FtsH proteases in spinach chloroplasts under light stress. / Nishimura, Miho; Nanba, Daisuke; Takaki, Takashi; Ohba, Chikako; Tsumura, Nodoka; Morita, Noriko; Sakamoto, Hirotaka; Murata, Kazuyoshi; Yamamoto, Yasusi.

In: Plant and Cell Physiology, Vol. 55, No. 7, 2014, p. 1255-1265.

Research output: Contribution to journalArticle

Nishimura, Miho ; Nanba, Daisuke ; Takaki, Takashi ; Ohba, Chikako ; Tsumura, Nodoka ; Morita, Noriko ; Sakamoto, Hirotaka ; Murata, Kazuyoshi ; Yamamoto, Yasusi. / Quality control of photosystem II : Direct imaging of the changes in the thylakoid structure and distribution of FtsH proteases in spinach chloroplasts under light stress. In: Plant and Cell Physiology. 2014 ; Vol. 55, No. 7. pp. 1255-1265.
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