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Proteomic analysis of the adaptation to warming in the Antarctic bacteria Shewanella frigidimarina

Proteomic analysis of the adaptation to warming in the Antarctic bacteria Shewanella frigidimarina

Biochimica et Biophysica Acta 1844(12): 2229-2240

Antarctica is subjected to extremely variable conditions, but the importance of the temperature increase in cold adapted bacteria is still unknown. To study the molecular adaptation to warming of Antarctic bacteria, cultures of Shewanella frigidimarina were incubated at temperatures ranging from 0°C to 30°C, emulating the most extreme conditions that this strain could tolerate. A proteomic approach was developed to identify the soluble proteins obtained from cells growing at 4°C, 20°C and 28°C. The most drastic effect when bacteria were grown at 28°C was the accumulation of heat shock proteins as well as other proteins related to stress, redox homeostasis or protein synthesis and degradation, and the decrease of enzymes and components of the cell envelope. Furthermore, two main responses in the adaptation to warm temperature were detected: the presence of diverse isoforms in some differentially expressed proteins, and the composition of chaperone interaction networks at the limits of growth temperature. The abundance changes of proteins suggest that warming induces a stress situation in S. frigidimarina forcing cells to reorganize their molecular networks as an adaptive response to these environmental conditions.

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Accession: 055256533

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PMID: 25149826

DOI: 10.1016/j.bbapap.2014.08.006

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