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- W1485771819 abstract "An enzyme has been found that alters the molecular structure of vitamin B2, adding a fourth ring to its existing three-ring system. The product catalyses new types of chemistry in concert with certain other enzymes. See Letters p.497 & p.502 A pair of manuscripts published this week [in this issue of Nature] describes detailed studies of the structure and mechanism of the enzymes UbiD and UbiX that together are responsible for non-oxidative reversible decarboxylation of aromatic substrates, and play a pivotal role in bacterial ubiquinone biosynthesis and microbial biodegradation of aromatic compounds. Mark White et al. show that UbiX is a flavin prenyltransferase, catalysing the covalent attachment of a fourth ring (the dimethylallyl group) to the N5 and C6 atoms of the three-ring riboflavin system. The unusual flavin-derived cofactor synthesized by UbiX is then used by UbiD, a decarboxylase, in the next step of the ubiquinone biosynthetic pathway. Karl Payne et al. show that the Fdc protein from Aspergillus niger (which is homologous to UbiD) uses 1,3-dipolar cycloaddition chemistry to catalyse the reversible decarboxylation of aromatic carboxylic acids. This is the first example of an enzyme-catalysed 1,3-dipolar cycloaddition reaction." @default.
- W1485771819 created "2016-06-24" @default.
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- W1485771819 date "2015-06-17" @default.
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- W1485771819 title "Unexpected role for vitamin B2" @default.
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- W1485771819 doi "https://doi.org/10.1038/nature14536" @default.
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