Cyanobacterial high-light-inducible proteins--Protectors of chlorophyll-protein synthesis and assembly.
Cyanobacteria contain a family of genes encoding one-helix high-light-inducible proteins (Hlips) that are homologous to light harvesting chlorophyll a/b-binding proteins of plants and algae. Based on various experimental approaches used for their study, a spectrum of functions that includes regulation of chlorophyll biosynthesis, transient chlorophyll binding, quenching of singlet oxygen and non-photochemical quenching of absorbed energy is ascribed to Hlips. However, these functions had not been supported by conclusive experimental evidence until recently when it became clear that Hlips are able to quench absorbed light energy and assist during terminal step(s) of the chlorophyll biosynthesis and early stages of Photosystem II assembly. In this review we summarize and discuss the present knowledge about Hlips and provide a model of how individual members of the Hlip family operate during the biogenesis of chlorophyll-proteins, namely Photosystem II. This article is part of a Special Issue entitled Organization and dynamics of bioenergetic systems in bacteria, edited by Conrad Mullineaux.
Institute of Microbiology, Laboratory of Photosynthesis, Centre Algatech, 37901 Třeboň, Czech Republic; Faculty of Science, University of South Bohemia, 370 05 České Budějovice, Czech Republic. Electronic address: komenda@alga.cz.
Josef
J
Komenda
Institute of Microbiology, Laboratory of Photosynthesis, Centre Algatech, 37901 Třeboň, Czech Republic; Faculty of Science, University of South Bohemia, 370 05 České Budějovice, Czech Republic.
Roman
R
Sobotka
D001426:Bacterial Proteins / Q000096:biosynthesis*; D001429:Bacteriochlorophylls / Q000096:biosynthesis*; D000458:Cyanobacteria / Q000378:metabolism*; D045342:Light-Harvesting Protein Complexes / Q000096:biosynthesis*
D001426:Bacterial Proteins; D001429:Bacteriochlorophylls; D045342:Light-Harvesting Protein Complexes; C026083:bacteriochlorophyll A proteins, Bacteria; C091582:high light-inducible protein, cyanobacteria
Chlorophyll; Cyanobacteria; High-light-inducible protein; Photosynthesis; Small Cab-like protein; Synechocystis sp. PCC 6803