Lidbury, Ian, Murrell, J. C. (J. Colin) and Chen, Yin (2015) Trimethylamine and trimethylamine N-oxide are supplementary energy sources for a marine heterotrophic bacterium : implications for marine carbon and nitrogen cycling. The ISME Journal, 9 . pp. 760-769. doi:10.1038/ismej.2014.149

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Abstract

Bacteria of the marine Roseobacter clade are characterised by their ability to utilise a wide range of organic and inorganic compounds to support growth. Trimethylamine (TMA) and trimethylamine N-oxide (TMAO) are methylated amines (MA) and form part of the dissolved organic nitrogen pool, the second largest source of nitrogen after N2 gas, in the oceans. We investigated if the marine heterotrophic bacterium, Ruegeria pomeroyi DSS-3, could utilise TMA and TMAO as a supplementary energy source and whether this trait had any beneficial effect on growth. In R. pomeroyi, catabolism of TMA and TMAO resulted in the production of intracellular ATP which in turn helped to enhance growth rate and growth yield as well as enhancing cell survival during prolonged energy starvation. Furthermore, the simultaneous use of two different exogenous energy sources led to a greater enhancement of chemoorganoheterotrophic growth. The use of TMA and TMAO primarily as an energy source resulted in the remineralisation of nitrogen in the form of ammonium, which could cross feed into another bacterium. This study provides greater insight into the microbial metabolism of MAs in the marine environment and how it may affect both nutrient flow within marine surface waters and the flux of these climatically important compounds into the atmosphere.

Item Type:	Journal Article
Subjects:	Q Science > QR Microbiology
Divisions:	Faculty of Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH):	Marine bacteria, Microbial metabolism
Journal or Publication Title:	The ISME Journal
Publisher:	Nature Publishing Group
ISSN:	1751-7362
Official Date:	March 2015
Dates:	Date Event March 2015 Published 22 August 2014 Available 11 July 2014 Accepted 21 June 2014 Submitted
Date of first compliant deposit:	27 December 2015
Volume:	9
Page Range:	pp. 760-769
DOI:	10.1038/ismej.2014.149
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Natural Environment Research Council (Great Britain) (NERC)
Grant number:	NE/H016236/1 (NERC)

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