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Towards bacterial strains overproducing l-tryptophan and other aromatics by metabolic engineering

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Abstract

The aromatic amino acids, l-tryptophan, l-phenylalanine, and l-tyrosine, can be manufactured by bacterial fermentation. Until recently, production efficiency of classical aromatic amino-acid-producing mutants had not yet reached a high level enough to make the fermentation method the most economic. With the introduction of recombinant DNA technology, it has become possible to apply more rational approaches to strain improvement. Many recent activities in this metabolic engineering have led to several effective approaches, which include modification of terminal pathways leading to removal of bottleneck or metabolic conversion, engineering of central carbon metabolism leading to increased supply of precursors, and transport engineering leading to reduced intracellular pool of the aromatic amino acids. In this review, advances in metabolic engineering for the production of the aromatic amino acids and useful aromatic intermediates are described with particular emphasis on two representative producer organisms, Corynebacterium glutamicum and Escherichia coli.

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  1. Department of Bioscience and Biotechnology, Faculty of Agriculture, Shinshu University, Minami-minowa, Nagano, 399-4598, Japan

    Masato Ikeda

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  1. Masato Ikeda
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Correspondence to Masato Ikeda.

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Ikeda, M. Towards bacterial strains overproducing l-tryptophan and other aromatics by metabolic engineering. Appl Microbiol Biotechnol 69, 615–626 (2006). https://doi.org/10.1007/s00253-005-0252-y

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  • DOI: https://doi.org/10.1007/s00253-005-0252-y

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