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31P NMR Studies of Isoprenoid Polyphosphate Acid-Base Equilibria.

✍ Scribed by Mark G. Swanson; Jan M. Robert; R. Kennedy Keller; Purushotham Bangalore

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
280 KB
Volume
35
Category
Article
ISSN
0749-1581

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✦ Synopsis

Isoprenoid polyphosphate intermediates of the mevalonate pathway were studied using 31P NMR. Acid-base titrations of farnesyl and geranylgeranyl polyphosphates were conducted over the pH range 4-10, and 31P chemical shifts were used to determine values for the second ionization step of the terminal phosphate groups. Apparent pK a º values ranged from 6.16 to 7.07, which may have important implications for biological reactions involving pK a these and similar molecules. In general, acid-catalyzed hydrolysis of the phosphomonoesters had little e †ect on the determination of values during the course of this study. 1997 by

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