%0 Journal Article
%A Tenhaef, Niklas
%A Kappelmann, Jannick
%A Eich, Arabel
%A Weiske, Marc
%A Brieß, Lisette
%A Brüsseler, Christian
%A Marienhagen, Jan
%A Wiechert, Wolfgang
%A Noack, Stephan
%T Microaerobic growth‐decoupled production of α‐ketoglutarate and succinate from xylose in a one‐pot process using Corynebacterium glutamicum
%J Biotechnology journal
%V 16
%N 9
%@ 1860-7314
%C Weinheim
%I Wiley-VCH
%M FZJ-2021-03236
%P 2100043 -
%D 2021
%Z Biotechnologie 1
%X BackgroundLignocellulosic biomass is the most abundant raw material on earth. Its efficient use for novel bio-based materials is essential for an emerging bioeconomy. Possible building blocks for such materials are the key TCA-cycle intermediates α-ketoglutarate and succinate. These organic acids have a wide range of potential applications, particularly in use as monomers for established or novel biopolymers. Recently, Corynebacterium glutamicum was successfully engineered and evolved towards an improved utilization of d-xylose via the Weimberg pathway, yielding the strain WMB2evo. The Weimberg pathway enables a carbon-efficient C5-to-C5 conversion of d-xylose to α-ketoglutarate and a shortcut route to succinate as co-product in a one-pot process.Methods and ResultsC. glutamicum WMB2evo was grown under dynamic microaerobic conditions on d-xylose, leading to the formation of comparably high amounts of succinate and only small amounts of α-ketoglutarate. Subsequent carbon isotope labeling experiments verified the targeted production route for both products in C. glutamicum WMB2evo. Fed-batch process development was initiated and the effect of oxygen supply and feeding strategy for a growth-decoupled co-production of α-ketoglutarate and succinate were studied in detail. The finally established fed-batch production process resulted in the formation of 78.4 mmol L−1 (11.45 g L−1) α-ketoglutarate and 96.2 mmol L−1 (11.36 g L−1) succinate.ConclusionThe developed one-pot process represents a promising approach for the combined supply of bio-based α-ketoglutarate and succinate. Future work will focus on tailor-made down-stream processing of both organic acids from the fermentation broth to enable their application as building blocks in chemical syntheses. Alternatively, direct conversion of one or both acids via whole-cell or cell-free enzymatic approaches can be envisioned; thus, extending the network of value chains starting from cheap and renewable d-xylose.AbstractThe Weimberg pathway enables a carbon-efficient C5-to-C5 conversion of xylose to α-ketoglutarate and a shortcut route to succinate as established platform chemical. In this study, we employed the recently engineered and evolved strain C. glutamicum WMB2evo to establish a one-pot cultivation process for co-production of α-ketoglutarate and succinate from xylose. 
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 34089621
%U <Go to ISI:>//WOS:000662896100001
%R 10.1002/biot.202100043
%U https://juser.fz-juelich.de/record/894460