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• W1569006646 abstract "A new procedure has been designed for the purification of nicotinate phosphoribosyltransferase and orotate phosphoribosyltransferase from the same baker's yeast extract. Using purified nicotinate phosphoribosyltransferase, the enzyme-catalyzed formation of nicotinate mononucleotide was analyzed using a new high pressure liquid chromatographic assay (Hanna, L., and Sloan, D. L. (1980) Anal. Biochem. 103, 230-234). Initial velocity measurements and product inhibition studies, with pyrophosphate, were performed. In addition, this assay procedure was used to demonstrate that purified nicotinate phosphoribosyltransferase possesses an ATPase activity in the presence of either product (pyrophosphate or nicotinate mononucleotide (NaMN] but in the absence of 5-phosphoribosyl alpha-1-pyrophosphate (P-Rib-PP). Moreover, exchanges of radioactivity between specific substrate/product pairs [( 14C]nicotinate/NaMN and [32P]PPi/P-Rib-PP) in the absence of other substrates were not observed when these pairs were incubated with nicotinate phosphoribosyltransferase, and binding of [14C] nicotinate to nicotinate phosphoribosyltransferase was not detected in the presence of ATP. In contrast, an exchange of label between ATP and [14C]ADP was characterized in the absence of other substrates and in the presence of either P-Rib-PP or PPi. These results indicate that nicotinate phosphoribosyltransferase proceeds through the use of an ordered Uni Uni Bi Ter Ping Pong kinetic mechanism during which ATP reacts with nicotinate phosphoribosyltransferase to form ADP and a previously described phosphorylated enzyme (Kosaka, A., Spivey, H. O., and Gholson, R. K. (1977) Arch. Biochem. Biophys. 179, 334-341). Thereafter, P-Rib-PP and nicotinate bind in order to the active site, to produce PPi and NaMN which are released in a random order followed by Pi. The Km values for ATP, P-Rib-PP, and nicotinate were calculated to be 70 +/- 10, 24 +/- 3, and 23 +/- 4 microM, respectively, whereas a value for Ki(PRPP) of 5 +/- 1 microM was determined." @default.
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• W1569006646 date "1983-08-01" @default.
• W1569006646 modified "2023-10-18" @default.
• W1569006646 title "Kinetic analysis of nicotinate phosphoribosyltransferase from yeast using high pressure liquid chromatography." @default.
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• W1569006646 doi "https://doi.org/10.1016/s0021-9258(17)44561-3" @default.
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