Nudix hydrolases that degrade dinucleoside and diphosphoinositol polyphosphates also have 5-phosphoribosyl 1-pyrophosphate (PRPP) pyrophosphatase activity that generates the glycolytic activator ribose 1,5-bisphosphate

被引:46
作者
Fisher, DI
Safrany, ST
Strike, P
McLennan, AG
Cartwright, JL
机构
[1] Univ Liverpool, Sch Biol Sci, Cell Regulat & Signalling Grp, Liverpool L69 7ZB, Merseyside, England
[2] Univ Dundee, Sch Life Sci, Div Cell Signalling, Dundee DD1 5EH, Scotland
关键词
D O I
10.1074/jbc.M209795200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A total of 17 Nudix hydrolases were tested for their ability to hydrolyze 5-phosphoribosyl 1-pyrophosphate (PRPP). All 11 enzymes that were active toward dinucleoside polyphosphates with 4 or more phosphate groups as substrates were also able to hydrolyze PRPP, whereas the 6 that could not and that have coenzyme A, NDP-sugars, or pyridine nucleotides as preferred substrates did not degrade PRPP. The products of hydrolysis were ribose 1,5-bisphosphate and P-i. Active PRPP pyrophosphatases included the diphosphoinositol polyphosphate phosphohydrolase (DIPP) subfamily of Nudix hydrolases, which also degrade the non-nucleotide diphosphoinositol polyphosphates. K-m and k(cat) values for PRPP hydrolysis for the Deinococcus radiodurans DR2356 (di)nucleoside polyphosphate hydrolase, the human diadenosine tetraphosphate hydrolase, and human DIPP-1 (diadenosine hexaphosphate and diphosphoinositol polyphosphate hydrolase) were 1 nM and 1.5 s(-1), 0.13 mM and 0.057 s(-1), and 0.38 mM and 1.0 s(-1), respectively. Active site mutants of the Caenorhabditis elegans diadenosine tetraphosphate hydrolase had no activity, confirming that the same active site is responsible for nucleotide and PRPP hydrolysis. Comparison of the specificity constants for nucleotide, diphosphoinositol polyphosphate, and PRPP hydrolysis suggests that PRPP is a significant substrate for the D. radiodurans DR2356 enzyme and for the DIPP subfamily. In the latter case, generation of the glycolytic activator ribose 1,5-bisphosphate may be a new function for these enzymes.
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收藏
页码:47313 / 47317
页数:5
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