Quality Control of Photosystem II: Role of Structural Changes of Thylakoid Membranes and FtsH Proteases in High Light Tolerance and Recovery from Photoinhibition

2016 ◽  
pp. 223-228
Author(s):  
Miho Yoshioka-Nishimura
Keyword(s):  
Quality Control ◽  
Photosystem Ii ◽  
Structural Changes ◽  
Thylakoid Membranes ◽  
High Light ◽  
Control Of Photosystem Ii

Carotenoids and Photosystem II Characteristics of Upper and Lower Halves of Leaves Acclimated to High Light

1996 ◽  
Vol 23 (6) ◽  
pp. 669 ◽  
Author(s):  
WW Iii Adams ◽  
B Demmig-Adams ◽  
DH Barker ◽  
S Kiley
Keyword(s):  
Chlorophyll Fluorescence ◽  
Photosystem Ii ◽  
Excitation Energy ◽  
Total Energy ◽  
Xanthophyll Cycle ◽  
Lower Surface ◽  
Thylakoid Membranes ◽  
High Light ◽  
Pigment Composition ◽  
Light Gradient

Acclimation of the leaves or stems of four succulent species to different light environments and to the light gradient across high light-acclimated tissues was examined through measurements of chlorophyll fluorescence and characterisation of the pigment composition of the thylakoid membranes. Whereas the total amounts of light striking the upper (sun-exposed) and lower (self-shaded) surfaces were quite different, resulting in a much smaller pool of the xanthophyll cycle carotenoids in the lower halves of high light-acclimated tissues, the conversion state of the xanthophyll cycle (the degree to which violaxanthin is converted to antheraxanthin and zeaxanthin) was similar throughout the tissues during exposure to natural sunlight. Under full sunlight, less than 25% of the light absorbed by the upper surface was utilised through photosynthesis, with the majority of the remaining excitation energy being dissipated thermally. In contrast, a considerably greater fraction of the light absorbed by the lower surface was utilised in photosynthesis, ranging from one-third to more than two-thirds of the total energy absorbed.

Quality control of photosystem II: impact of light and heat stresses

2008 ◽  
Vol 98 (1-3) ◽  
pp. 589-608 ◽  
Author(s):  
Yasusi Yamamoto ◽  
Ryota Aminaka ◽  
Miho Yoshioka ◽  
Mahbuba Khatoon ◽  
Keisuke Komayama ◽  
...  
Keyword(s):  
Quality Control ◽  
Photosystem Ii ◽  
Control Of Photosystem Ii

scholarly journals Quality Control of Photosystem II

2006 ◽  
Vol 281 (31) ◽  
pp. 21660-21669 ◽  
Author(s):  
Miho Yoshioka ◽  
Suguru Uchida ◽  
Hiroki Mori ◽  
Keisuke Komayama ◽  
Satoshi Ohira ◽  
...  
Keyword(s):  
Quality Control ◽  
Photosystem Ii ◽  
Control Of Photosystem Ii

The role of calcium in the pH-dependent control of Photosystem II

1993 ◽  
Vol 37 (2) ◽  
pp. 117-130 ◽  
Author(s):  
Anja Krieger ◽  
Engelbert Weis
Keyword(s):  
Photosystem Ii ◽  
Ph Dependent ◽  
Control Of Photosystem Ii

scholarly journals High-Light versus Low-Light: Effects on Paired Photosystem II Supercomplex Structural Rearrangement in Pea Plants

2020 ◽  
Vol 21 (22) ◽  
pp. 8643
Author(s):  
Alessandro Grinzato ◽  
Pascal Albanese ◽  
Roberto Marotta ◽  
Paolo Swuec ◽  
Guido Saracco ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photosystem Ii ◽  
Structural Rearrangement ◽  
Structural Features ◽  
Thylakoid Membranes ◽  
Variable Number ◽  
High Light ◽  
Low Light ◽  
Cryo Electron Microscopy ◽  
Light Effects

In plant grana thylakoid membranes Photosystem II (PSII) associates with a variable number of antenna proteins (LHCII) to form different types of supercomplexes (PSII-LHCII), whose organization is dynamically adjusted in response to light cues, with the C2S2 more abundant in high-light and the C2S2M2 in low-light. Paired PSII-LHCII supercomplexes interacting at their stromal surface from adjacent thylakoid membranes were previously suggested to mediate grana stacking. Here, we present the cryo-electron microscopy maps of paired C2S2 and C2S2M2 supercomplexes isolated from pea plants grown in high-light and low-light, respectively. These maps show a different rotational offset between the two supercomplexes in the pair, responsible for modifying their reciprocal interaction and energetic connectivity. This evidence reveals a different way by which paired PSII-LHCII supercomplexes can mediate grana stacking at diverse irradiances. Electrostatic stromal interactions between LHCII trimers almost completely overlapping in the paired C2S2 can be the main determinant by which PSII-LHCII supercomplexes mediate grana stacking in plants grown in high-light, whereas the mutual interaction of stromal N-terminal loops of two facing Lhcb4 subunits in the paired C2S2M2 can fulfil this task in plants grown in low-light. The high-light induced accumulation of the Lhcb4.3 protein in PSII-LHCII supercomplexes has been previously reported. Our cryo-electron microscopy map at 3.8 Å resolution of the C2S2 supercomplex isolated from plants grown in high-light suggests the presence of the Lhcb4.3 protein revealing peculiar structural features of this high-light-specific antenna important for photoprotection.

scholarly journals Quality control of Photosystem II: Cleavage and aggregation of heat-damaged D1 protein in spinach thylakoids

2007 ◽  
Vol 1767 (6) ◽  
pp. 838-846 ◽  
Author(s):  
Keisuke Komayama ◽  
Mahbuba Khatoon ◽  
Daichi Takenaka ◽  
Junko Horie ◽  
Amu Yamashita ◽  
...  
Keyword(s):  
Quality Control ◽  
Photosystem Ii ◽  
D1 Protein ◽  
Spinach Thylakoids ◽  
Control Of Photosystem Ii
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