Aerobic proteobacterial methylotrophs in Movile Cave: genomic and metagenomic analyses

Kumaresan, Deepak, Stephenson, Jason, Doxey, Andrew C., Bandukwala, Hina, Brooks, Elliot, Hillebrand-Voiculescu, Alexandra, Whiteley, Andrew S. and Murrell, J Colin (2018) Aerobic proteobacterial methylotrophs in Movile Cave: genomic and metagenomic analyses. Microbiome, 6. ISSN 2049-2618

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    Abstract

    Background: Movile Cave (Mangalia, Romania) is a unique ecosystem where the food web is sustained by microbial primary production, analogous to deep-sea hydrothermal vents. Specifically, chemoautotrophic microbes deriving energy from the oxidation of hydrogen sulphide and methane form the basis of the food web. Results: Here, we report the isolation of the first methane-oxidizing bacterium from the Movile Cave ecosystem, Candidatus Methylomonas sp. LWB, a new species and representative of Movile Cave microbial mat samples. While previous research has suggested a prevalence of anoxic conditions in deeper lake water and sediment, using small-scale shotgun metagenome sequencing, we show that metabolic genes encoding enzymes for aerobic methylotrophy are prevalent in sediment metagenomes possibly indicating the presence of microoxic conditions. Moreover, this study also indicates that members within the family Gallionellaceae (Sideroxydans and Gallionella) were the dominant taxa within the sediment microbial community, thus suggesting a major role for microaerophilic iron-oxidising bacteria in nutrient cycling within the Movile Cave sediments. Conclusions: In this study, based on phylogenetic and metabolic gene surveys of metagenome sequences, the possibility of aerobic microbial processes (i.e., methylotrophy and iron oxidation) within the sediment is indicated. We also highlight significant gaps in our knowledge on biogeochemical cycles within the Movile Cave ecosystem, and the need to further investigate potential feedback mechanisms between microbial communities in both lake sediment and lake water.

    Item Type: Article
    Uncontrolled Keywords: movile cave,methylotrophic bacteria,one-carbon metabolism,methane,methanotrophs,extreme ecosystem
    Faculty \ School: Faculty of Science > School of Environmental Sciences
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    Depositing User: Pure Connector
    Date Deposited: 12 Jan 2018 17:30
    Last Modified: 30 Sep 2018 00:55
    URI: https://ueaeprints.uea.ac.uk/id/eprint/65923
    DOI: 10.1186/s40168-017-0383-2

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