Response of Barotolerant Deep-Sea Bacteria to High Pressure.

概要

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Although the deep - sea environment with high pressure and low temperature is rigorous for microorganisms in costal water, many barotolerant and barophilic bacteria are found to be inhabiting there. It is very important for the barophilic or barotolerant bacteria to maintain the physiological functions of cell membrane, because many vital functions are involved in the membrane. The fluidity of membrane composed by phospholipids and proteins is essential for the physiological functions. As high hydrostatic pressure raises the melting point of lipids and causes the phase transition of lipid within 100 MPa, barotolerant bacteria under high hydrostatic pressure appear to regulate the fluidity of membrane phospholipids. Therefore, the characterization of membrane at high pressure is indispensable to clarify the biochemical adaptation of bacteria to the environment. This report dealt with effects of pressure and temperature on the lipid composition of barotolerant deep - sea bacteria. The bacteria maintained the membrane fluidity by increasing unique fatty acids under high hydrostatic pressure.
日本高圧力学会の論文