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Characterisation of acetogen formatotrophic potential using Eubacterium limosum
Ist Teil von
Applied microbiology and biotechnology, 2023-07, Vol.107 (14), p.4507-4518
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2023
Quelle
SpringerLink
Beschreibungen/Notizen
Formate is a promising energy carrier that could be used to transport renewable electricity. Some acetogenic bacteria, such as
Eubacterium limosum
, have the native ability to utilise formate as a sole substrate for growth, which has sparked interest in the biotechnology industry. However, formatotrophic metabolism in
E. limosum
is poorly understood, and a system-level characterisation in continuous cultures is yet to be reported. Here, we present the first steady-state dataset for
E. limosum
formatotrophic growth. At a defined dilution rate of 0.4 d
-1
, there was a high specific uptake rate of formate (280 ± 56 mmol/gDCW/d; gDCW = gramme dry cell weight); however, most carbon went to CO
2
(150 ± 11 mmol/gDCW/d). Compared to methylotrophic growth, protein differential expression data and intracellular metabolomics revealed several key features of formate metabolism. Upregulation of phosphotransacetylase (Pta) appears to be a futile attempt of cells to produce acetate as the major product. Instead, a cellular energy limitation resulted in the accumulation of intracellular pyruvate and upregulation of pyruvate formate ligase (Pfl) to convert formate to pyruvate. Therefore, metabolism is controlled, at least partially, at the protein expression level, an unusual feature for an acetogen. We anticipate that formate could be an important one-carbon substrate for acetogens to produce chemicals rich in pyruvate, a metabolite generally in low abundance during syngas growth.
Key points
First Eubacterium limosum steady-state formatotrophic growth omics dataset
High formate specific uptake rate, however carbon dioxide was the major product
Formate may be the cause of intracellular stress and biofilm formation