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Production of tyrosine from sucrose or glucose achieved by rapid genetic changes to phenylalanine-producing Escherichia coli strains.

Appl. Microbiol. Biotechnol.2007 Apr;74(5):1031-40. doi:10.1007/s00253-006-0746-2. Epub 2007 Jan 11
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摘要


Escherichia coli K12 strains producing L-phenylalanine were converted to L-tyrosine-producing strains using a novel genetic method for gene replacement. We deleted a region of the E. coli K12 chromosome including the pheA gene encoding chorismate mutase/prephenate dehydratase, its leader peptide (pheL), and its promoter using a new polymerase chain reaction-based method that does not leave a chromosomal scar. For high level expression of tyrA, encoding chorismate mutase/prephenate dehydrogenase, its native promoter was replaced with the strong trc promoter. The linked DeltapheLA and Ptrc-tyrA::Kan(R) genetic modifications were moved into L-phenylalanine producing strains by generalized transduction to convert L-phenylalanine-producing strains to L-tyrosine-producing strains. Moreover, introduction of a plasmid carrying genes responsible for sucrose degradation into these strains enabled L-tyrosine-production from sucrose.

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