Regular paperThe roles of the extrinsic subunits in Photosystem II as revealed by EPR
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Cited by (57)
Effect of lanthanides on oxidation of Mn<sup>2+</sup> cations via a high-affinity Mn-binding site in photosystem II membranes
2023, Journal of Inorganic BiochemistryCharacterization of fluoride inhibition in photosystem II lacking extrinsic PsbP and PsbQ subunits
2018, Journal of Photochemistry and Photobiology B: BiologyCitation Excerpt :These studies show that the effect of F− on PSII lacking the extrinsic subunits is very similar to its effect on intact PSII, suggesting that F− does not directly interfere with the function of Ca2+. PSII-enriched thylakoid membranes (intact PSII) were prepared from fresh market spinach by extraction with Triton X-100 as described previously [30] and modified by others [31,32]. The final preparation was stored in liquid nitrogen in buffer containing 20 mM MES-NaOH, pH 6.3, 0.4 M sucrose, and 15 mM NaCl.
PsbO, the manganese-stabilizing protein: Analysis of the structure-function relations that provide insights into its role in photosystem II
2011, Journal of Photochemistry and Photobiology B: BiologyCitation Excerpt :The dispensability of PsbO in Mn photoligation experiments provides evidence to suggest that PsbO is not required for binding of Mn to PSII and that as such it has no amino acid residues that function as direct ligands to the Mn cluster. While PsbO is unnecessary for binding of a substrate water molecule to the Mn cluster, at least in the S1 state [12], its indispensable role in the oxygen evolution reaction has been demonstrated by the consequences of its extraction from PSII, which can be implemented by washing intact samples with alkaline-Tris [13], 1 M CaCl2 [14] or MgCl2 [15], or 0.2 M NaCl–2.6 M urea [16]. In the latter case, the combination of ionic strength and a chaotropic agent dissociates the protein under fairly mild conditions.
Fragmentation and separation analysis of the photosynthetic membrane from spinach
2009, Biochimica et Biophysica Acta - BioenergeticsCitation Excerpt :A similar preparation obtained by repeated sonication and batch partitioning of grana vesicles has been characterized with respect to antenna size, absorption and fluorescence spectra [45]. Compared to PSII particles prepared by detergents such as “BBY” particles [46], the grana core vesicles have about the same Chl a/b ratio, 2.0 compared to 1.9 for detergent particles [47], but a higher Chl/PSII ratio, 355 compared to 250 for detergent particles [48]. This is due to the small amount of PSI in the grana core vesicles and that chlorophyll containing proteins are extracted from thylakoids when using detergent treatment.
The manganese and calcium ions of photosynthetic oxygen evolution
1992, BBA - Bioenergetics