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- W2082254725 abstract "When cell-free preparations of Chlorella pyrenoidosa Chick (Emerson strain 3) form thiosulfate from labeled sulfate, another radioactive compound also appears. This compound has been isolated in quantity and is shown to be identical with adenosine-3′-phosphate-5′-phosphosulfate (PAPS) on the basis of its chromatographic and electrophoretic behavior, chemical composition, sensitivity to selective degradative enzymes, and its ability to serve as a substrate for rat liver aryl sulphotransferase. In addition, as expected for PAPS, the compound on mild acid treatment yields all of its radioactive sulfur as sulfate, and is converted to a compound identical with adenosine-3′,5′-diphosphate (PAP). Replacement of sulfate and ATP by this PAP35S in the usual incubation mixture yields the same product, thiosulfate, which can be isolated as such or detected as acid-volatile radioactivity. This conversion of PAP35S to thiosulfate still requires the addition of Mg2+ and a reductant such as 2,3-dimercaptopropan-1-ol (BAL). The cause of our previous result that high concentrations of ATP inhibit thiosulfate formation from sulfate can be ascribed to a small amount of PAP contaminating the ATP preparations, since PAP proves to be an exceedingly effective inhibitor of the conversion of PAP35S to thiosulfate. Sulfate reduction to thiosulfate by Chlorella extracts is discussed and compared with similar systems from other organisms." @default.
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- W2082254725 title "Studies of Sulfate Utilization by Algae. 6. Adenosine-3′-Phosphate-5′-Phosphosulfate (PAPS) as an Intermediate in Thiosulfate Formation From Sulfate by Cell-Free Extracts of Chlorella" @default.
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- W2082254725 doi "https://doi.org/10.1104/pp.43.4.563" @default.
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