Synthesis of l(-)-carnitine by hydration of crotonobetaine by enterobacteria
Tóm tắt
Enterobacteria, especially Escherichia coli, Salmonella typhimurium and Proteus vulgaris, are capable of forming l(-)-carnitine by hydration of the double bond of crotonobetaine under anaerobic conditions. The carnitine hydrolyase is an inducible cytosolic enzyme which catalyses either the dehydration of l-carnitine or the hydration of crotonobetaine. In growing cultures, the addition of fumarate to a complex or minimal medium stimulated l-carnitine synthesis by diminishing the reduction of crotonobetaine to γ-butyrobetaine. However, l-carnitine synthesis was repressed after addition of nitrate or under aerobic conditions. If the carnitine hydrolyase was induced by l-carnitine or crotonobetaine, these respiratory chain electron acceptors did not impair carnitine formation by resting cells, indicating an epigenetical regulation of carnitine synthesis. Using this bacterial pathway for the biosynthesis of l-carnitine, conditions for producing a high yield are described. The method has some advantages in comparison with other biochemical or microbiological procedures for the production of l-carnitine.
Tài liệu tham khảo
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