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Radiation damage to membranes of the thermophilic bacterium, Thermus thermophilus HB-8: membrane damage without concomitant lipid peroxidation.

When irradiated with γ rays at 0°C, the thermophilic bacterium, Thermus thermophilus HB-8, which can grow at 49-85°C, lost its ability to retain intracellular K+ as did other bacterial and mammalian cells, including red blood cells. Judging from the K+ content and colony formation of cells after exposure to γ rays and uv light, the decreased K+ content of cells irradiated with γ rays is not attributable to cell death, but to membrane damage. Since the membrane lipids of HB-8 cells contain no unsaturated fatty acyl groups, these findings indicate that neither lipid peroxidation nor change in unsaturated fatty acyl groups is essential for radiation-induced change in K+ permeability of the cell membranes.