Photosynthesis: Mechanisms and Effects

pp 229-232

Gloeobacter Violaceus — Investigation of Carotenoids and Carotenoid Associated Proteins

  • P. JöstingmeyerAffiliated withMolekulare Pflanzenphysiologie, Universität Bremen
  • , F. KoenigAffiliated withMolekulare Pflanzenphysiologie, Universität Bremen

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In photosynthetic organisms carotenoids serve two major functions: as accessory pigments for light harvesting and in protection against photooxidative damage. This work focuses on the dynamic occurrence, localization and function of carotenoids in the unusual cyanobacterium Gloeobacter violaceus which combines several outstanding characteristics: the lack of thylakoids [1], the absence of the typical long wavelength fluorescence emission of PS I at 77K [2] and the presence of a phycourobilin chromophore in addition to phycoerythrobilin [3]. The carotenoid composition of Gloeobacter violaceus was studied under various light intensities. Purifications lead to a carotenoid associated protein which might play a role in the light adaptation of the organism.

Key words

adaptation Chl cyanobacteria HPLC light stress pigment-protein complexes