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• W2028792023 endingPage "95" @default.
• W2028792023 startingPage "86" @default.
• W2028792023 abstract "A new continuous coupled uv-spectrophotometric assay is described for two phosphate-releasing enzymes, aspartate transcarbamylase and ATPase of herpes simplex virus (HSV). Phosphate release is coupled to the phosphorolysis of the nucleoside analog 7-methylinosine (m7Ino) catalyzed by purine nucleoside phosphorylase. When this reaction is monitored at 291 nm, the coupled assay can readily detect 10 nmol Pireleased/min. Our method offers advantages over a recently reported continuous assay devised for measuring aspartate transcarbamylase activity using the nucleoside analog methylthioguanosine (MESG) as the linking substrate. In contrast to MESG, m7Ino is easily and inexpensively synthesized and is also commercially available. The spectrophotometric signal at 291 nm, produced by the difference in the extinction coefficients between nucleoside substrate and the base product, is significant over a much wider pH range than the signal difference between MESG and its phosphorolysis product at 360 nm. Saturation curves for aspartate and carbamyl phosphate and pH rate profiles have been reproduced using the purine nucleoside phosphorylase/m7Ino coupled assay. Initial velocity patterns constructed over micromolar to millimolar concentrations of aspartate and carbamyl phosphate yielded four kinetic parameters simultaneously. To further illustrate the application of this coupled assay, kinetic parameters were determined for the DNA-dependent ATPase reaction of HSV helicase–primase." @default.
• W2028792023 created "2016-06-24" @default.
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• W2028792023 date "1997-03-01" @default.
• W2028792023 modified "2023-09-26" @default.
• W2028792023 title "A Continuous Spectrophotometric Assay for Aspartate Transcarbamylase and ATPases" @default.
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• W2028792023 doi "https://doi.org/10.1006/abio.1996.9962" @default.
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• W2028792023 hasPublicationYear "1997" @default.
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