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Title: A novel chlorophyll protein complex in the repair cycle of photosystem II

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [1]; ORCiD logo [2];  [3]; ORCiD logo [1];  [4]; ORCiD logo [4];  [1];  [5]; ORCiD logo [1]
  1. Department of Biology, Washington University in St. Louis, St. Louis, MO 63130,
  2. Center for Solar Energy &, Energy Storage, Department of Energy, Environmental, &, Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130,
  3. Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO 63110,, Department of Physics, Washington University in St. Louis, St. Louis, MO 63130,
  4. Department of Chemistry, Washington University in St. Louis, St. Louis, MO 63130
  5. Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO 63110,

In oxygenic photosynthetic organisms, photosystem II (PSII) is a unique membrane protein complex that catalyzes light-driven oxidation of water. PSII undergoes frequent damage due to its demanding photochemistry. It must undergo a repair and reassembly process following photodamage, many facets of which remain unknown. We have discovered a PSII subcomplex that lacks 5 key PSII core reaction center polypeptides: D1, D2, PsbE, PsbF, and PsbI. This pigment–protein complex does contain the PSII core antenna proteins CP47 and CP43, as well as most of their associated low molecular mass subunits, and the assembly factor Psb27. Immunoblotting, mass spectrometry, and ultrafast spectroscopic results support the absence of a functional reaction center in this complex, which we call the “no reaction center” complex (NRC). Analytical ultracentrifugation and clear native PAGE analysis show that NRC is a stable pigment–protein complex and not a mixture of free CP47 and CP43 proteins. NRC appears in higher abundance in cells exposed to high light and impaired protein synthesis, and genetic deletion of PsbO on the PSII luminal side results in an increased NRC population, indicative that NRC forms in response to photodamage as part of the PSII repair process. Our finding challenges the current model of the PSII repair cycle and implies an alternative PSII repair strategy. Formation of this complex may maximize PSII repair economy by preserving intact PSII core antennas in a single complex available for PSII reassembly, minimizing the risk of randomly diluting multiple recycling components in the thylakoid membrane following a photodamage event.

Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-99ER20350; SC0001035
OSTI ID:
1571354
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 43 Vol. 116; ISSN 0027-8424
Publisher:
Proceedings of the National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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