A thermophilic, chemolithoautotrophic, and aerobic microbial consortium (termed carbonitroflex) growing in a nutrient-poor medium and an atmosphere containing N2, O2, CO2, and CO is investigated as a model to expand our understanding of extreme biological systems. Here we show that the consortium is dominated by Carbonactinospora thermoautotrophica (strain StC), followed by Sphaerobacter thermophilus, Chelatococcus spp., and Geobacillus spp. Metagenomic analysis of the consortium reveals a mutual relationship among bacteria, with C. thermoautotrophica StC exhibiting carboxydotrophy and carbon-dioxide storage capacity. C. thermoautotrophica StC, Chelatococcus spp., and S. thermophilus harbor genes encoding CO dehydrogenase and formate oxidase. No pure cultures were obtained under the original growth conditions, indicating that a tightly regulated interactive metabolism might be required for group survival and growth in this extreme oligotrophic system. The breadwinner hypothesis is proposed to explain the metabolic flux model and highlight the vital role of C. thermoautotrophica StC (the sole keystone species and primary carbon producer) in the survival of all consortium members. Our data may contribute to the investigation of complex interactions in extreme environments, exemplifying the interconnections and dependency within microbial communities.
|Original language||English (US)|
|State||Published - Mar 1 2023|
Bibliographical noteKAUST Repository Item: Exported on 2023-03-07
Acknowledged KAUST grant number(s): BAS/1/1096-01-01
Acknowledgements: This research was financially supported by the National Council for Research and Development (CNPq), the National Council for the Improvement of Higher Education (CAPES), and a KAUST Baseline Grant (to Prof. A. S. Rosado) (BAS/1/1096-01-01). We thank Edir Martins Ferreira and Tahira Jamil for their excellent technical assistance and Prof. E. Zonta for soil analysis. We would like to remember Professor Ulysses Lins, who is sadly no longer with us and to whom we owe much more than words.