Abstract
Penetration of glucose into cells of several extremely halophilic archaebacteria of the Halobacterium and Haloferax genera (Halobacterium saccharovorum and Halobacterium salinarium, Haloferax volcanii and Haloferax mediterranei) has been studied. Some characteristics of transport systems of carbohydrate-utilizing halobacteria Halobacterium saccharovorum, Haloferax mediterranei and Haloferax volcanii (pH and temperature optima, stereospecificity, kinetic parameters) have been determined. Inability of H. salinarium cells for active glucose transport has been shown. The dependence of glucose transport on the Na+ ions gradient (on the whole cells and membrane vesicles) has been demonstrated. Cells or membrane vesicles of carbohydrate-utilizing halobacteria grown in media containing this sugar indicated the activation of glucose transport, whereas cells grown in media without sugars did not. This fact has allowed us to conclude that corresponding transport systems are inducible.
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