The Complete Genome Sequence of Clostridium aceticum: a Missing Link between Rnf- and Cytochrome-Containing
Anja Poehlein1, Martin Cebulla2, Marcus M Ilg2
1Genomic and Applied Microbiology & Göttingen Genomics Laboratory, Georg-August University, Göttingen, Germany.
Mbio
|September 10, 2015
Summary
Clostridium aceticum, an autotrophic acetogen, has a sequenced genome revealing unique energy metabolism. This bacterium may serve as a valuable workhorse for sustainable biotechnological processes using CO2 and H2.
Area of Science:
- Microbiology
- Genomics
- Metabolic Engineering
Background:
- Autotrophic acetogenic bacteria are gaining industrial importance for converting CO2 and H2 or syngas into valuable products.
- Clostridium aceticum is a key species, notable for its unique phylogenetic position and ability to utilize these gases.
- Its potential for sustainable bioproduction and greenhouse gas reduction is significant.
Purpose of the Study:
- To present the complete genome sequence of Clostridium aceticum.
- To analyze its unique energy metabolism and compare it with other autotrophic acetogens.
- To explore its potential for biotechnological applications and metabolic engineering.
Main Methods:
- Whole-genome sequencing of Clostridium aceticum.
- Bioinformatic analysis of the genome, focusing on energy conservation pathways.
- Comparative genomics with related acetogenic bacteria.
Main Results:
- The Clostridium aceticum genome comprises a 4.2-Mbp chromosome and a 5.7-kbp plasmid.
- It possesses an Rnf complex for energy conservation and a cytochrome, suggesting a link between different acetogen types.
- Absence of quinone biosynthesis genes indicates the cytochrome is likely not involved in proton translocation via electron transport.
Conclusions:
- Clostridium aceticum exhibits a unique energy metabolism, distinct from other known autotrophic acetogens.
- Its genome sequence provides a foundation for understanding its physiology and optimizing its use in biotechnology.
- The identified metabolic features offer potential targets for improving ATP yield and expanding its biotechnological applications.
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