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Title: Nanodomains of Cytochromeb 6  fand Photosystem II Complexes in Spinach Grana Thylakoid Membranes  

Journal Article · · The Plant Cell
 [1];  [1];  [1];  [1]
  1. Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, United Kingdom

AbstractThe cytochrome b  6  f (cytb  6  f) complex plays a central role in photosynthesis, coupling electron transport between photosystem II (PSII) and photosystem I to the generation of a transmembrane proton gradient used for the biosynthesis of ATP. Photosynthesis relies on rapid shuttling of electrons by plastoquinone (PQ) molecules between PSII and cytb  6  f complexes in the lipid phase of the thylakoid membrane. Thus, the relative membrane location of these complexes is crucial, yet remains unknown. Here, we exploit the selective binding of the electron transfer protein plastocyanin (Pc) to the lumenal membrane surface of the cytb  6  f complex using a Pc-functionalized atomic force microscope (AFM) probe to identify the position of cytb  6  f complexes in grana thylakoid membranes from spinach (Spinacia oleracea). This affinity-mapping AFM method directly correlates membrane surface topography with Pc-cytb  6  f interactions, allowing us to construct a map of the grana thylakoid membrane that reveals nanodomains of colocalized PSII and cytb6f complexes. We suggest that the close proximity between PSII and cytb  6  f complexes integrates solar energy conversion and electron transfer by fostering short-range diffusion of PQ in the protein-crowded thylakoid membrane, thereby optimizing photosynthetic efficiency.

Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001035
OSTI ID:
1144735
Report Number(s):
DE-SC0001035-119
Journal Information:
The Plant Cell, Vol. 26, Issue 7; ISSN 1040-4651
Publisher:
American Society of Plant Biologists (ASPB)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 61 works
Citation information provided by
Web of Science

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