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Significance Colwellia psychrerythraea 34H is a cold-adapted marine bacterium that represents a genus and species cosmopolitan to the cold ocean. To our knowledge, metabolic flux studies of an obligate psychrophile like 34H are not available. We characterized the physiology and metabolism of 34H, at normal-growth temperature of 4 °C and upper-stress condition of room temperature (23 °C), by integrating metabolic flux studies (tracking13 C-labeled compounds) and genetic analyses (transcriptomics). Results from these system-level analyses reveal unique metabolic features under cold salty conditions, which broaden our understanding of microbial ecology in the cold ocean, currently vulnerable to global warming. Specific findings have relevance to bioremediation of pollutants from the petroleum industry, increasingly active in polar seas, and to biomanufacturing of cold-adapted enzymes.

Model metabolic strategy for heterotrophic bacteria in the cold ocean based on Colwellia psychrerythraea 34H