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Ramlibacter tataouinensis
''Ramlibacter tataouinensis'' is a Gram-negative beta-proteobacterium. It was first isolated from meteorite fragments buried in the sands of a desert near Tataouine, Tunisia. The bacterium may exist as two forms: cyst and rod. Its morphology depends on the environment. During daytime when the desert environment is extremely hot and dry, ''Ramlibacter tataouinensis'' exist in cyst form. In its cyst form, ''Ramlibacter tataouinensis'' is well protected against desiccation.
Remarkably, this novel desert bacterium has the highest known average G+C content among the beta-proteobacterium. G+C base pairs are known to have stronger hydrogen bonding interactions than A+T base pairing. Thus, a higher G+C content may prove to be a protective mechanism for life in harsh desert conditions.
==Light Receptors==
The genome of ''Ramlibacter tataouinensis'' encodes for numerous light receptors. The number of light receptors found in ''Ramlibacter tataouinensis'', a chemolithotroph, is usually seen in phototrophic bacteria. A total of six genes encodes for light sensing proteins : 2 red/infrared sensing and 4 blue light sensing. These light sensing proteins would allow ''Ramlibacter tataouinensis'' to distinguish between night and day. A discrete ability to "tell time" may facilitate the growth pattern of the desert bacterium. During cold desert nights, dew forms and the availability of water confers ''Ramlibacter tataouinensis'' with limiting substrate i.e. water which may stimulate cell growth and division.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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