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Bioenergetics and solute uptake under extreme conditions.

S V Albers¹, J L Van de Vossenberg, A J Driessen

¹Department of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands.

Extremophiles : Life Under Extreme Conditions

|November 9, 2001

Summary

Microorganisms maintain constant proton permeability across membranes at varying temperatures through lipid adjustments, except for thermophilic bacteria which utilize sodium ions. This adaptation is crucial for energy generation and nutrient transport in diverse microbial life.

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Area of Science:

Microbiology and Biochemistry
Membrane Biophysics
Bioenergetics

Background:

Cytoplasmic membrane ion permeabilities, especially for protons and sodium ions, are vital for microbial bioenergetics.
Membrane permeability generally increases with temperature, posing challenges for cellular energy homeostasis.
Microorganisms exhibit adaptive strategies to maintain membrane function across different thermal environments.

Purpose of the Study:

To investigate the homeoproton permeability strategies employed by various microorganisms.
To understand the role of sodium ions in the bioenergetics of thermophilic bacteria.
To explore solute transport mechanisms, particularly in hyperthermophilic archaea and bacteria.

Main Methods:

Analysis of lipid composition adjustments in microbial membranes.
Comparative study of proton and sodium ion permeabilities across different microbial groups.
Identification and characterization of transport systems, including ATP-binding cassette (ABC) transporters.

Main Results:

Psychrophilic, mesophilic, and halophilic microbes maintain constant proton permeability (homeoproton permeability) via lipid adjustments.
Thermophilic bacteria are an exception, relying on sodium motive force due to higher proton permeability.
Hyperthermophilic bacteria and archaea predominantly utilize primary uptake systems, such as high-affinity ABC transporters for sugars.

Conclusions:

Microbial membrane adaptation is key to maintaining bioenergetic efficiency across diverse temperatures.
Sodium ion transport is critical for energy generation in thermophilic bacteria.
Specialized ABC transporters enable hyperthermophiles to thrive in nutrient-limited extreme environments.