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The stress-induced SCP/HLIP family of small light-harvesting-like proteins (ScpABCDE) protects Photosystem II from photoinhibitory damages in the cyanobacterium Synechocystis sp. PCC 6803
Umeå University, Faculty of Science and Technology, Department of Chemistry. SC Synchrotron SOLEIL, AILES beamline, L’Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, France.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2018 (English)In: Photosynthesis Research, ISSN 0166-8595, E-ISSN 1573-5079, Vol. 135, no 1–3, p. 103-114Article in journal (Refereed) Published
Abstract [en]

Small CAB-like proteins (SCPs) are single-helix light-harvesting-like proteins found in all organisms performing oxygenic photosynthesis. We investigated the effect of growth in moderate salt stress on these stress-induced proteins in the cyanobacterium Synechocystis sp. PCC 6803 depleted of Photosystem I (PSI), which expresses SCPs constitutively, and compared these cells with a PSI-less/ScpABCDE mutant. SCPs, by stabilizing chlorophyll-binding proteins and Photosystem II (PSII) assembly, protect PSII from photoinhibitory damages, and in their absence electrons accumulate and will lead to ROS formation. The presence of 0.2 M NaCl in the growth medium increased the respiratory activity and other PSII electron sinks in the PSI-less/ScpABCDE strain. We postulate that this salt-induced effect consumes the excess of PSII-generated electrons, reduces the pressure of the electron transport chain, and thereby prevents 1O2 production.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 135, no 1–3, p. 103-114
Keyword [en]
Small CAB-like proteins (SCPs), Photosystem II photoinhibition, Singlet oxygen, Salt stress, Terminal oxidases
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:umu:diva-143745DOI: 10.1007/s11120-017-0426-3ISI: 000423338500011PubMedID: 28795265OAI: oai:DiVA.org:umu-143745DiVA, id: diva2:1171615
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-02-27Bibliographically approved

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