Filling the 'green gap' of the major light-harvesting chlorophyll a/b complex by covalent attachment of Rhodamine Red
| Autor: | Harald Paulsen, Sabine Wiegand, Kristina Gundlach, Mara Werwie |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Chlorophyll
LHCII Protein Folding FRET (Förster resonance energy transfer) Chlorophyll a Absorption spectroscopy Biophysics Photosynthesis Photochemistry Biochemistry Rhodamine Light-harvesting complex chemistry.chemical_compound Fluorescent Dyes Rhodamines Chlorophyll A food and beverages Site-specific labeling Cell Biology Maleimide dye B vitamins Solar spectrum chemistry Visible spectrum |
| Zdroj: | Biochimica et Biophysica Acta (BBA) - Bioenergetics. 1787:1499-1504 |
| ISSN: | 0005-2728 |
| DOI: | 10.1016/j.bbabio.2009.07.003 |
| Popis: | The major light-harvesting chlorophyll a/b complex (LHCII) greatly enhances the efficiency of photosynthesis in green plants. Recombinant LHCII can be assembled in vitro from its denatured, bacterially expressed apoprotein and plant pigments. This makes it an interesting candidate for biomimetic light-harvesting in photovoltaic applications. Due to its almost 20 pigments bound per apoprotein, LHCII absorbs efficiently in the blue and red spectral domains of visible light but less efficiently in the green domain, the so-called “green gap” in its absorption spectrum. Here we present a hybrid complex of recombinant LHCII with organic dyes that add to LHCII absorption in the green spectral region. One or three Rhodamine Red dye molecules were site-specifically attached to cysteine side chains in the apoprotein and did not interfere with LHCII assembly, function and stability. The dyes transferred their excitation energy virtually completely to the chlorophylls in LHCII, partially filling in the green gap. Thus, organic dyes can be used to increase the absorption cross section and, thus, the light-harvesting efficiency of recombinant LHCII. |
| Databáze: | OpenAIRE |
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