pH Optimum of the Photosystem II H2O Oxidation Reaction: Effects of PsbO, the Manganese-Stabilizing Protein, Cl– Retention, and Deprotonation of a Component Required for O2 Evolution Activity

Biochemistry ◽  
2012 ◽  
Vol 51 (18) ◽  
pp. 3808-3818 ◽  
Author(s):  
Alan Commet ◽  
Nicholas Boswell ◽  
Charles F. Yocum ◽  
Hana Popelka
Keyword(s):  
Photosystem Ii ◽  
Oxidation Reaction ◽  
O2 Evolution ◽  
Ph Optimum ◽  
Manganese Stabilizing Protein

scholarly journals The photosystem II-associated Cah3 in Chlamydomonas enhances the O2 evolution rate by proton removal

2008 ◽  
Vol 27 (5) ◽  
pp. 782-791 ◽  
Author(s):  
Tatiana Shutova ◽  
Hella Kenneweg ◽  
Joachim Buchta ◽  
Julia Nikitina ◽  
Vasily Terentyev ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Evolution Rate ◽  
O2 Evolution

Photosynthesis, quenching of chlorophyll fluorescence and thermal energy dissipation in iron-deficient sugar beet leaves

1998 ◽  
Vol 25 (4) ◽  
pp. 403 ◽  
Author(s):  
Fermín Morales ◽  
Anunciación Abadía ◽  
Javier Abadía
Keyword(s):  
Energy Dissipation ◽  
Iron Deficiency ◽  
Photosystem Ii ◽  
Sugar Beet ◽  
Electron Flow ◽  
Reaction Centers ◽  
O2 Evolution ◽  
Photosystem Ii Efficiency ◽  
Iron Deficient ◽  
Additional Support

In sugar beet (Beta vulgaris L.) iron deficiency decreased not only the photosynthetic rate but also the actual photosystem II efficiency at steady-state photosynthesis. In moderate iron deficiency, the decrease in actual photosystem II efficiency under illumination was related to closure of photosystem II reaction centers, whereas in severe iron deficiency it was associated to decreases of intrinsic photosystem II efficiency. The O2 evolution, on an absorbed light basis, decreased more than the actual photosystem II efficiency, suggesting the presence of a significant fraction of electron transport to molecular oxygen or the existence of some form of cyclic electron flow. Iron-deficient leaves reduced the excess of light absorbed that cannot be used in photosynthesis not only by decreasing absorptance, but also by dissipating a large part of the light absorbed by the photosystem II antenna. This mechanism, that protects the photosystem II reaction centers through the enhancement of energy dissipation, was related to the de-epoxidation of violaxanthin (V) to antheraxanthin (A) and zeaxanthin (Z) in iron-deficient leaves. These data provide additional support for a role of Z+A in photoprotection under conditions of excess photosynthetic light absorption.

Hydrodynamic Studies on the Manganese-Stabilizing Protein of Photosystem II†

Biochemistry ◽  
1998 ◽  
Vol 37 (39) ◽  
pp. 13553-13558 ◽  
Author(s):  
Igor Z. Zubrzycki ◽  
Laurie K. Frankel ◽  
Paul S. Russo ◽  
Terry M. Bricker
Keyword(s):  
Photosystem Ii ◽  
Manganese Stabilizing Protein
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