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• W2772005092 abstract "Mitochondria play a key role in the biosynthesis of two metal cofactors, iron–sulfur (FeS) clusters and molybdenum cofactor (Moco). The two pathways intersect at several points, but a scarcity of mutants has hindered studies to better understand these links. We screened a collection of sirtinol-resistant Arabidopsis thaliana mutants for lines with decreased activities of cytosolic FeS enzymes and Moco enzymes. We identified a new mutant allele of ATM3 (ABC transporter of the mitochondria 3), encoding the ATP-binding cassette transporter of the mitochondria 3 (systematic name ABCB25), confirming the previously reported role of ATM3 in both FeS cluster and Moco biosynthesis. We also identified a mutant allele in CNX2, cofactor of nitrate reductase and xanthine dehydrogenase 2, encoding GTP 3′,8-cyclase, the first step in Moco biosynthesis which is localized in the mitochondria. A single-nucleotide polymorphism in cnx2-2 leads to substitution of Arg88 with Gln in the N-terminal FeS cluster-binding motif. cnx2-2 plants are small and chlorotic, with severely decreased Moco enzyme activities, but they performed better than a cnx2-1 knockout mutant, which could only survive with ammonia as a nitrogen source. Measurement of cyclic pyranopterin monophosphate (cPMP) levels by LC–MS/MS showed that this Moco intermediate was below the limit of detection in both cnx2-1 and cnx2-2, and accumulated more than 10-fold in seedlings mutated in the downstream gene CNX5. Interestingly, atm3-1 mutants had less cPMP than wild type, correlating with previous reports of a similar decrease in nitrate reductase activity. Taken together, our data functionally characterize CNX2 and suggest that ATM3 is indirectly required for cPMP synthesis." @default.
• W2772005092 created "2017-12-22" @default.
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• W2772005092 date "2018-01-31" @default.
• W2772005092 modified "2023-09-27" @default.
• W2772005092 title "Genetic dissection of cyclic pyranopterin monophosphate biosynthesis in plant mitochondria" @default.
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• W2772005092 doi "https://doi.org/10.1042/bcj20170559" @default.
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