| Unique Properties vs. Common Themes: The Atypical Cyanobacterium Gloeobacter violaceus PCC 7421 is Capable of State Transitions and Blue-light Induced Fluorescence Quenching{dagger} | |
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MedLine Citation:
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PMID: 22302714 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The atypical unicellular cyanobacterium Gloeobacter violaceus PCC 7421, which diverged very early during the evolution of cyanobacteria, can be regarded as a key organism for understanding many structural, functional, regulatory and evolutionary aspects of oxygenic photosynthesis. In the present work, the performance of two basic photosynthetic adaptation/protection mechanisms, common to all other oxygenic photoautrophs had been challenged in this ancient cyanobacterium which lacks thylakoid membranes: state transitions and non-photochemical fluorescence quenching. Both low-temperature fluorescence spectra and room-temperature fluorescence transients show that G. violaceus is capable to perform state transitions similar to evolutionary more recent cyanobacteria, being in state 2 in darkness and in state 1 upon illumination by weak blue or far red light. Compared to state 2, variable fluorescence yield in state 1 is strongly enhanced (almost 80%), while the functional absorption cross-section of PS2 is only increased by 8%. In contrast to weak blue light, which enhances fluorescence yield via state 1 formation, strong blue light reversibly quenches chlorophyll fluorescence in G. violaceus. This strongly suggests regulated heat dissipation which is triggered by the orange carotenoid protein whose presence was directly proven by immunoblotting and mass spectrometry in this primordial cyanobacterium. The results are discussed in the framework of cyanobacterial evolution. |
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Authors:
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Gábor Bernát; Ulrich Schreiber; Esther Sendtko; Igor N Stadnichuk; Sascha Rexroth; Matthias Rögner; Friederike Koenig |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-2-1 |
Journal Detail:
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Title: Plant & cell physiology Volume: - ISSN: 1471-9053 ISO Abbreviation: - Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-2-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9430925 Medline TA: Plant Cell Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Plant Biochemistry, Ruhr-University Bochum, D-44801 Bochum, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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