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

Tibiletti, TaniaUmeå universitet,Kemiska institutionen,SC Synchrotron SOLEIL, AILES beamline, L’Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, France (författare)

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.

NATURVETENSKAP Biologi Biokemi och molekylärbiologi hsv//swe
NATURAL SCIENCES Biological Sciences Biochemistry and Molecular Biology hsv//eng
Small CAB-like proteins (SCPs)
Photosystem II photoinhibition
Singlet oxygen
Salt stress
Terminal oxidases

Rehman, Ateeq Ur (författare)
Vass, Imre (författare)
Funk, ChristianeUmeå universitet,Kemiska institutionen(Swepub:umu)chefuk04 (författare)
Umeå universitetKemiska institutionen (creator_code:org_t)

Av författaren/redakt...: Tibiletti, Tania; Rehman, Ateeq Ur; Vass, Imre; Funk, Christiane

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