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• W2021934773 abstract "The use of abbreviated pathway constructs leads to trapping of a series of cobalamin intermediates, allowing assignment of the full biosynthetic pathway and defining the roles of CobL as a dual-function methyltransferase and CobE as a likely carrier protein, perhaps facilitating metabolic channeling. The biosynthesis of many vitamins and coenzymes has often proven difficult to elucidate owing to a combination of low abundance and kinetic lability of the pathway intermediates. Through a serial reconstruction of the cobalamin (vitamin B12) pathway in Escherichia coli and by His tagging the terminal enzyme in the reaction sequence, we have observed that many unstable intermediates can be isolated as tightly bound enzyme-product complexes. Together, these approaches have been used to extract intermediates between precorrin-4 and hydrogenobyrinic acid in their free acid form and permitted the delineation of the overall reaction catalyzed by CobL, including the formal elucidation of precorrin-7 as a metabolite. Furthermore, a substrate-carrier protein, CobE, that can also be used to stabilize some of the transient metabolic intermediates and enhance their onward transformation, has been identified. The tight association of pathway intermediates with enzymes provides evidence for a form of metabolite channeling." @default.
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• W2021934773 date "2012-10-07" @default.
• W2021934773 modified "2023-10-16" @default.
• W2021934773 title "An enzyme-trap approach allows isolation of intermediates in cobalamin biosynthesis" @default.
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• W2021934773 doi "https://doi.org/10.1038/nchembio.1086" @default.
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