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Bioenergetics and solute uptake under extreme conditions

Albers, S-V., Vossenberg, J. L. C. M. V. D., Driessen, A. J. M. & Konings, W. N., 2001, In : Extremophiles. 5, 5, p. 285 - 294 10 p.

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  • Bioenergetics and solute uptake under extreme conditions

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DOI

The ion and particularly the proton and sodium ion permeabilities of cytoplasmic membranes play crucial roles in the bioenergetics of microorganisms. The proton and sodium permeabilities of membranes increase with temperature. Psychrophilic and mesophilic bacteria and mesophilic, (hyper)thermophilic, and halophilic archaea are capable of adjusting the lipid composition of their membranes in such a way that the proton permeability at the respective growth temperature remains constant (homeoproton permeability). Thermophilic bacteria are an exception. They rely on the less permeable sodium ions to generate a sodium motive force, which is subsequently used to drive energy-requiring membrane-bound processes. Transport of solutes across bacterial and archaeal membranes is mainly catalyzed by primary ATP-driven transport systems or by proton- or sodium-motive-force-driven secondary transport systems. Unlike most bacteria, hyperthermophilic bacteria and archaea prefer primary uptake systems. Several high-affinity ATP-binding cassette (ABC) transporters for sugars from hyperthermophiles have been identified and characterized. The activities of these ABC transporters allow these organisms to thrive in their nutrient-poor environments.
Original languageEnglish
Pages (from-to)285 - 294
Number of pages10
JournalExtremophiles
Volume5
Issue number5
Publication statusPublished - 2001
Event3rd International Congress on Extremophiles - , Germany
Duration: 1-Jan-2000 → …

Event

3rd International Congress on Extremophiles

01/01/2000 → …

Germany

Event: Other

    Keywords

  • ABC transporter, secondary transporter, solute-binding protein, bioenergetics, proton motive force, sodium motive force, ARCHAEON THERMOCOCCUS-LITORALIS, BACTERIUM CLOSTRIDIUM-FERVIDUS, COUPLED ENERGY TRANSDUCTION, MALTOSE-BINDING PROTEIN, HALOFERAX-VOLCANII, TRANSPORT-SYSTEM, ABC TRANSPORTER, GENOME SEQUENCE, METHANOBACTERIUM-THERMOAUTOTROPHICUM, SULFOLOBUS-ACIDOCALDARIUS

ID: 1213265