0000000000353619

AUTHOR

Hans Rogl

showing 2 related works from this author

Chlorophyll b is involved in long-wavelength spectral properties of light-harvesting complexes LHC I and LHC II.

2001

AbstractChlorophyll (Chl) molecules attached to plant light-harvesting complexes (LHC) differ in their spectral behavior. While most Chl a and Chl b molecules give rise to absorption bands between 645 nm and 670 nm, some special Chls absorb at wavelengths longer than 700 nm. Among the Chl a/b-antennae of higher plants these are found exclusively in LHC I. In order to assign this special spectral property to one chlorophyll species we reconstituted LHC of both photosystem I (Lhca4) and photosystem II (Lhcb1) with carotenoids and only Chl a or Chl b and analyzed the effect on pigment binding, absorption and fluorescence properties. In both LHCs the Chl-binding sites of the omitted Chl species…

Chlorophyll bChlorophyllPhotosystem IIPigment bindingPhotosynthetic Reaction Center Complex ProteinsBiophysicsLight-Harvesting Protein ComplexesPhotosystem IPhotochemistryBiochemistryAbsorptionLight-harvesting complexReconstitutionchemistry.chemical_compoundSolanum lycopersicumStructural BiologySpinacia oleraceaGeneticsChlorophyll bindingCentrifugation Density GradientMolecular BiologyChlorophyll fluorescenceLong-wavelength chlorophyllBinding SitesPhotosystem I Protein ComplexChemistryChlorophyll ATemperaturePhotosystem II Protein ComplexLight-harvesting complexes of green plantsCell BiologyPigments BiologicalPlant LeavesSpectrometry FluorescenceLight-harvesting complexChlorophyll fluorescenceChlorophyll bindingProtein BindingFEBS letters
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Determination of relative chlorophyll binding affinities in the major light-harvesting chlorophyll a/b complex.

2002

The major light-harvesting complex (LHCIIb) of photosystem II can be reconstituted in vitro from its recombinant apoprotein in the presence of a mixture of carotenoids and chlorophylls a and b. By varying the chlorophyll a/b ratio in the reconstitution mixture, the relative amounts of chlorophyll a and chlorophyll b bound to LHCIIb can be changed. We have analyzed the chlorophyll stoichiometry in recombinant wild type and mutant LHCIIb reconstituted at different chlorophyll a/b ratios in order to assess relative affinities of the chlorophyll-binding sites. This approach reveals five sites that exclusively bind chlorophyll b. Another site exhibits a slight preference of chlorophyll b over ch…

Chlorophyll bChlorophyllChlorophyll aPhotosystem IIPhotosynthetic Reaction Center Complex ProteinsLight-Harvesting Protein ComplexesBiologyBiochemistrychemistry.chemical_compoundChlorophyll bindingBinding siteMolecular BiologyCarotenoidchemistry.chemical_classificationBinding SitesPeasPhotosystem II Protein ComplexCell BiologyRecombinant ProteinsB vitaminsKineticsBiochemistrychemistryAmino Acid SubstitutionChlorophyllMutagenesis Site-DirectedThe Journal of biological chemistry
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