Bacterial metabolism of methylated amines and identification of novel methylotrophs in Movile Cave

Wischer, Daniela, Kumaresan, Deepak, Johnston, Antonia, El Khawand, Myriam, Stephenson, Jason, Hillebrand-Voiculescu, Alexandra M., Chen, Yin and Murrell, J. Colin (2015) Bacterial metabolism of methylated amines and identification of novel methylotrophs in Movile Cave. The ISME Journal, 9 (1). pp. 195-206. ISSN 1751-7362

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Abstract

Movile Cave, Romania, is an unusual underground ecosystem that has been sealed off from the outside world for several million years and is sustained by non-phototrophic carbon fixation. Methane and sulfur-oxidising bacteria are the main primary producers, supporting a complex food web that includes bacteria, fungi and cave-adapted invertebrates. A range of methylotrophic bacteria in Movile Cave grow on one-carbon compounds including methylated amines, which are produced via decomposition of organic-rich microbial mats. The role of methylated amines as a carbon and nitrogen source for bacteria in Movile Cave was investigated using a combination of cultivation studies and DNA stable isotope probing (DNA-SIP) using 13 C-monomethylamine (MMA). Two newly developed primer sets targeting the gene for gamma-glutamylmethylamide synthetase (gmaS), the first enzyme of the recently-discovered indirect MMA-oxidation pathway, were applied in functional gene probing. SIP experiments revealed that the obligate methylotroph Methylotenera mobilis is one of the dominant MMA utilisers in the cave. DNA-SIP experiments also showed that a new facultative methylotroph isolated in this study, Catellibacterium sp. LW-1 is probably one of the most active MMA utilisers in Movile Cave. Methylated amines were also used as a nitrogen source by a wide range of non-methylotrophic bacteria in Movile Cave. PCR-based screening of bacterial isolates suggested that the indirect MMA-oxidation pathway involving GMA and N-methylglutamate is widespread among both methylotrophic and non-methylotrophic MMA utilisers from the cave.

Item Type: Article
Faculty \ School:
Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Pure Connector
Date Deposited: 15 Mar 2016 13:01
Last Modified: 17 Sep 2019 09:32
URI: https://ueaeprints.uea.ac.uk/id/eprint/57489
DOI: 10.1038/ismej.2014.102

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