Journal
ENVIRONMENTAL MICROBIOLOGY
Volume 19, Issue 6, Pages 2301-2319Publisher
WILEY
DOI: 10.1111/1462-2920.13725
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Funding
- SNIC through Uppsala Multidisciplinary Center for Advanced Computational Science (UPPMAX) [b2011200]
- Goran Gustafsson Foundation for Research in Natural Sciences and Medicine
- Swedish Research Council VR
- Crafoord Foundation
- BONUS BLUEPRINT project
- BONUS
- joint Baltic Sea research and development programme [185]
- European Union's Seventh Programme for research, technological development and demonstration
- Swedish Research Council FORMAS
- Spanish Ministry of Science and Innovation [CTM2013-48292-C3-3-R]
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Much of the phenotype of a microorganism consists of its repertoire of metabolisms and how and when its proteins are deployed under different growth conditions. Hence, analyses of protein expression could provide important understanding of how bacteria adapt to different environmental settings. To characterize the flexibility of proteomes of marine bacteria, we investigated protein profiles of three important marine bacterial lineages - Oceanospirillaceae (Neptuniibacter caesariensis strain MED92), Roseobacter (Phaeobacter sp. MED193) and Flavobacteria (Dokdonia sp. MED134) - during transition from exponential to stationary phase. As much as 59-80% of each species' total proteome was expressed. Moreover, all three bacteria profoundly altered their expressed proteomes during growth phase transition, from a dominance of proteins involved in translation to more diverse proteomes, with a striking appearance of enzymes involved in different nutrient-scavenging metabolisms. Whereas the three bacteria shared several overarching metabolic strategies, they differed in important details, including distinct expression patterns of membrane transporters and proteins in carbon and phosphorous metabolism and storage compounds. These differences can be seen as signature metabolisms - metabolisms specific for lineages. These findings suggest that quantitative proteomics can inform about the divergent ecological strategies of marine bacteria in adapting to changes in environmental conditions.
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