Growth of the acetogenic bacterium Acetobacterium woodii on glycerol and dihydroxyacetone

  • More than 2 million tons of glycerol are produced during industrial processes each year and, therefore, glycerol is an inexpensive feedstock to produce biocommodities by bacterial fermentation. Acetogenic bacteria are interesting production platforms and there have been few reports in the literature on glycerol utilization by this ecophysiologically important group of strictly anaerobic bacteria. Here, we show that the model acetogen Acetobacterium woodii DSM1030 is able to grow on glycerol, but contrary to expectations, only for 2–3 transfers. Transcriptome analysis revealed the expression of the pdu operon encoding a propanediol dehydratase along with genes encoding bacterial microcompartments. Deletion of pduAB led to a stable growth of A. woodii on glycerol, consistent with the hypothesis that the propanediol dehydratase also acts on glycerol leading to a toxic end-product. Glycerol is oxidized to acetate and the reducing equivalents are reoxidized by reducing CO2 in the Wood–Ljungdahl pathway, leading to an additional acetate. The possible oxidation product of glycerol, dihydroxyacetone (DHA), also served as carbon and energy source for A. woodii and growth was stably maintained on that compound. DHA oxidation was also coupled to CO2 reduction. Based on transcriptome data and enzymatic analysis we present the first metabolic and bioenergetic schemes for glycerol and DHA utilization in A. woodii.
Author:Dragan Trifunović, Jimyung Moon, Anja Poehlein, Rolf Daniel, Volker MüllerORCiD
Parent Title (English):Environmental microbiology
Place of publication:Oxford [u.a.]
Document Type:Article
Date of Publication (online):2021/04/05
Date of first Publication:2021/04/05
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2022/03/16
Page Number:11
First Page:2648
Last Page:2658
We are indebted to the Deutsche Forschungsgemeinschaft for financial support.
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie
Licence (German):License LogoCreative Commons - Namensnennung 4.0