Insights into the genome structure of four acetogenic bacteria with specific reference to the Wood–Ljungdahl pathway

MicrobiologyOpen

Maria Luisa Chiusano¹  Olivier Jousson²  Alfonso Esposito²  Luca Triboli²  Sabrina Tamburini³  Luca Ambrosino⁴ 

[1] Department of Agricultural sciences University of Naples “Federico II” Portici Italy;Department of Cellular, Computational and Integrative Biology—CIBIO University of Trento Trento Italy;Department of Genetics and Genomic Sciences Icahn School of Medicine at Mount Sinai NY USA;Research Infrastructures for Marine Biological Resources (RIMAR) Stazione Zoologica Anton Dohrn Naples Italy;

关键词: Acetogens;    Comparative genomics;    NGS;    Wood–Ljungdahl pathway;   

DOI  :  10.1002/mbo3.938

来源: DOAJ

【 摘 要 】

Abstract Acetogenic bacteria are obligate anaerobes with the ability of converting carbon dioxide and other one‐carbon substrates into acetate through the Wood–Ljungdahl (WL) pathway. These substrates are becoming increasingly important feedstock in industrial microbiology. The main potential industrial application of acetogenic bacteria is the production of metabolites that constitute renewable energy sources (biofuel); such bacteria are of particular interest for this purpose thanks to their low energy requirements for large‐scale cultivation. Here, we report new genome sequences for four species, three of them are reported for the first time, namely Acetobacterium paludosum DSM 8237, Acetobacterium tundrae DSM 917, Acetobacterium bakii DSM 8239, and Alkalibaculum bacchi DSM 221123. We performed a comparative genomic analysis focused on the WL pathway's genes and their encoded proteins, using Acetobacterium woodii as a reference genome. The Average Nucleotide Identity (ANI) values ranged from 70% to 95% over an alignment length of 5.4–6.5 Mbp. The core genome consisted of 363 genes, whereas the number of unique genes in a single genome ranged from 486 in A. tundrae to 2360 in A.bacchi. No significant rearrangements were detected in the gene order for the Wood–Ljungdahl pathway however, two species showed variations in genes involved in formate metabolism: A. paludosum harbor two copies of fhs1, and A. bakii a truncated fdhF1. The analysis of protein networks highlighted the expansion of protein orthologues in A. woodii compared to A. bacchi, whereas protein networks involved in the WL pathway were more conserved. This study has increased our understanding on the evolution of the WL pathway in acetogenic bacteria.

【 授权许可】

Unknown