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. 2021 May 10;20:97. doi: 10.1186/s12934-021-01586-3

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Schematic representation of the metabolic pathway for glutarate production, flux enforcement by deletion of gdh (left panel) and ammonium assimilation by the GS/GOGAT system (right panel). Gene names are shown next to enzyme reactions (arrows), gene deletions are indicated by red crosses. Enzymes from P. stutzeri (dark grey), E. coli (light grey) and native enzymes (orange) are highlighted. gabT, GABA/5AVA amino transferase; gabD, succinate/glutarate-semialdehyde dehydrogenase; ldcC, l-lysine decarboxylase; patA, putrescine transaminase; patD, γ-aminobutyraldehyde dehydrogenase;glnA, glutamine synthetase (GS); gltBD, l-glutamic acid-2-oxoglutarate aminotransferase (GOGAT); gdh, l-glutamic acid dehydrogenase