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The Small Cab-like ...
The Small Cab-like Proteins in the cyanobacterium Synechocystis sp. PCC 6803
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- Hernández-Prieto, Miguel Angel, 1975- (author)
- Umeå universitet,Kemiska institutionen,Christiane Funk
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- Funk, Christiane, Professor (thesis advisor)
- Umeå universitet,Kemiska institutionen
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- Mullineaux, Conrad, Professor (opponent)
- School of Biological and Chemical Science, Queen Mary, University of London
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(creator_code:org_t)
- ISBN 9789172648494
- Umeå : Umeå universitet, 2009
- English 49 s.
- Related links:
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Abstract
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- The Small Cab-like Proteins (SCPs) in the cyanobacterium Synechocystis sp. PCC 6803 accumulate in cells grown under different stress conditions. Genes coding for SCPs have been found in all sequenced organisms performing oxygenic photosynthesis and even in the genomes of cyanophages. Deletion of multiple scp genes in Synechocystis resulted in mutants with severely impaired growth and altered pigment content. These findings indicate the importance of SCPs in photosynthesis; however, their specific function is not well understood. SCPs share a chlorophyll-binding motif with the plant light harvesting complex, suggesting that they bind chlorophyll. Here I describe my findings, which unambiguously show that SCPs are able to bind chlorophyll in vitro. Although they affect both the stoichiometric ratio of Photosystem I to II and chlorophyll stability, they do not seem to be directly involved in non-photochemical quenching. I was able to reveal the location of the SCPs within the cyanobacterial cell: in stressed cells they attach to Photosystem II in the thylakoid membrane. Furthermore, I revealed the presence of another light-harvesting like (Lil)/SCP protein in Synechocystis sp. PCC 6803. The gene, slr1544, codifying for this newly characterised LilA protein, co-transcribes together with scpD and also appears to bind to Photosystem II during stress.
Subject headings
- NATURVETENSKAP -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
- NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
Keyword
- Photosynthesis
- Photosystem II
- chlorophyll-binding proteins
- tetrapyrrole biosynthesis
- photodamage
- non-photochemical quenching
- SCPs
- LHCII
- Biochemistry
- Biokemi
- Plant physiology
- Växtfysiologi
- biokemi
- Biochemistry
Publication and Content Type
- vet (subject category)
- dok (subject category)
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