Claim · model-written summary
A model built from the PSII supercomplex structure predicted that two neighboring complexes share a trimeric light-harvesting complex.
- Taxon
- spinach
Spinacia oleraceae0 - Outcome
- two neighboring complexes share a trimeric light-harvesting complexe1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growing spinach plants”
e1“a model on the supramolecular arrangement was generated predicting that two neighboring complexes share a trimeric light-harvesting complex”
Title
Low-Light-Induced Formation of Semicrystalline Photosystem II Arrays in Higher Plant Chloroplasts
Helmut Kirchhoff; Winfried Haase; Sandra Wegner; et al. Biochemistry 2007. doi:10.1021/bi700748y
Other claims from this paper (10)
- Intervention effect Growing spinach plants under low light intensities up-regulated light-harvesting complexes.
- Intervention effect Growing spinach plants under low light intensities down-regulated photosystem II and cytochrome b6f complexes.
- Intervention effect Low-light growth increased the antenna size of PSII in spinach by 40-60%, estimated by fluorescence induction and LHCII/PSII stoichiometry.
- Observation Low-light-induced changes in protein composition were accompanied by formation of ordered particle arrays in the exoplasmic fracture face of grana thylakoids, detected by freeze-fracture electron microscopy.
- Observation Most likely the highly ordered arrays in spinach grana thylakoids consist of PSII complexes.
- Observation In the ordered arrays, the distance between neighboring complexes in the same row was 18.0 nm.
- Observation In the ordered arrays, the separation between two rows was 23.7 nm.
- Observation In the ordered arrays, the angle between the particle axis and the row was 26 degrees.
- Mechanism The authors suggest that supramolecular reorganization into ordered arrays in low-light grana thylakoids is a strategy to overcome potential diffusion problems in the crowded membrane.
- Mechanism A hexagonal phase of the lipid monogalactosyldiacylglycerol in grana membranes of low-light-adapted plants could trigger the rearrangement by changing lateral membrane pressure.