Claim · model-written summary
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.
- Taxon
- spinach
Spinacia oleraceae0 - Organ / stage
- grana thylakoidse1
- Outcome
- formation of ordered particle arrayse1
Not reportedMaterialGeneCompoundInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growing spinach plants”
e1“the formation of ordered particle arrays in the exoplasmic fracture face in grana thylakoids detected by freeze-fracture electron microscopy”
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 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.
- Observation A model built from the PSII supercomplex structure predicted that two neighboring complexes share a trimeric light-harvesting complex.
- 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.