NDLI: A novel Nudix hydrolase for oxidized purine nucleoside triphosphates encoded by ORFYLR151c (PCD1 gene) in Saccharomyces cerevisiae

Content Provider	PubMed Central
Author	Nunoshiba, Tatsuo Ishida, Rikiya Sasaki, Michi Iwai, Shigenori Nakabeppu, Yusaku Yamamoto, Kazuo
Copyright Year	2004
Abstract	A search for candidates for a functional homologue of Escherichia coli MutT in yeast Saccharomyces cerevisiae was made in the NCBI-BLAST database using the Nudix box, a short amino acid sequence conserved among E.coli MutT, Pseudomonoas vulgaris MutT, and human, rat and mouse MTH1. Among five candidates, we focused on the open reading frame YLR151c, because it had a region with ∼76% similarity to the N-terminal half of MutT including the Nudix box. We thus evaluated the ability of YLR151c as a functional homologue of E.coli MutT in S.cerevisiae. Expression of YLR151c was able to suppress the transversion from A:T to C:G caused by misincorporation of the oxidized nucleotide 8-oxo-dGTP in the E.coli mutT-deficient strain. The disruption of the YLR151c in yeast strain caused ∼14-fold increase in the frequency of spontaneous mutation compared to the wild type. Additionally, biochemical analysis indicated that GST-YLR151c fusion protein possessed pyrophosphatase activity for both 7,8-dihydro-8-oxo-2′-deoxyguanosine triphosphate (8-oxo-dGTP) and 1,2-dihydro-2-hydroxy-2′-deoxyadenosine triphosphate (2-OH-dATP). The specific activity of GST-YLR151c for 8-oxo-dGTP was 5.6 × 10−3 μM−1 s−1, which was similar to that of RibA, a backup enzyme for MutT in E.coli, but was 150-fold lower than that of hMTH1. From these results, we conclude that YLR151c has an ability to prevent spontaneous mutagenesis via sanitization of oxidized nucleotides, and that it may be the functional homologue of E.coli MutT in S.cerevisiae.
Related Links	http://dx.doi.org/10.1093/nar/gkh868
Ending Page	5348
Page Count	10
Starting Page	5339
File Format	PDF
ISSN	13624962
e-ISSN	13624962
Journal	Nucleic Acids Research
Issue Number	18
Volume Number	32
Language	English
Publisher	Oxford University Press
Publisher Date	2004-10-11
Access Restriction	Open
Rights Holder	Oxford University Press
Subject Keyword	Genetics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics

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