High impact information on Silicomolybdate

• Controlled trypsin digestion of thylakoid membranes inhibited oxygen evolution using 2,6-dichlorobenzoquinone, but had no effect when using ferricyanide or silicomolybdate [1].
• To examine the involvement of redox-active beta-carotene (Car) in the pathway, two Car molecules in Mn-depleted PSII membranes of spinach were selectively bleached by illumination at 250 K in the presence of ferricyanide and silicomolybdate [2].
• Inhibition of electron transport from water to lipophilic acceptors but not to silicomolybdate [3].
• Correlation of the light-induced change of absorbance with ESR signal of photosystem II in presence of silicomolybdate [4].
• The site of inhibition of isoalloalantolactone is located in the span of P680 to QA redox enzymes because the uncoupled electron transport from water to silicomolybdate and, from DPC to DCIP are inhibited approximately to the same extent [5].

Biological context of Silicomolybdate

• 2. 3. Electron transport from H2O to silicomolybdate (in the presence of diuron) does not support ATP formation [6].
• Silicomolybdate reduction supports virtually no phosphorylation, regardless of the reduction pathway, when the reaction mixture contains no protective agents [7].
• Pathways of silicomolybdate photoreduction and associated photophosphorylation in tobacco chloroplasts [7].

Associations of Silicomolybdate with other chemical compounds

• The membranes of these electrodes consist of mebeverinium-silicotungstate (Mv-ST), silicomolybdate (Mv-SM), phosphotungstate (Mv-PT), or phosphomolybdate (Mv-PM) ion-associations dispersed in PVC matrix with dibutyl phthalate plasticizer [8].
• 3. Electron transport from water to silicomolybdate (+ DCMU) is not coupled to ATP formation, nor is there a measurable accumulation of protons within the membrane (measured by amine uptake) [9].
• Oxygen-production experiments using silicomolybdate as an artificial acceptor (which accepts from both pheophytin and QB in PSII membranes) demonstrated that the inhibition is at or near the DCMU site [10].

Analytical, diagnostic and therapeutic context of Silicomolybdate

• A Fourier transform infrared (FTIR) difference spectrum upon photooxidation of the accessory chlorophyll (Chlz) of photosystem II (PS II) was obtained at 210 K with Mn-depleted PS II membranes in the presence of fericyanide and silicomolybdate [11].

References