Bacterial model membranes under the harsh subsurface conditions of Mars

Tortorella, Attila; Oliva, Rosario; Giancola, Concetta; Petraccone, Luigi; Winter, Roland

doi:10.1039/d3cp03911k

Phys. Chem. Chem. Phys.

2024

DOI: 10.1039/d3cp03911k

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Bacterial model membranes under the harsh subsurface conditions of Mars

Attila Tortorella,

Rosario Oliva,

Concetta Giancola

et al.

Abstract: Biomembranes are an essential component of all living systems. Most research on membranes is restricted to ambient physiological conditions. However, the influence of extreme conditions, such as the deep subsurface...

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Preservation of Bacillus subtilis’ cellular liquid state at deep sub-zero temperatures in perchlorate brines

Gault,

Fonseca,

Cockell

2024

Commun Biol

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Although a low temperature limit for life has not been established, it is thought that there exists a physical limit imposed by the onset of intracellular vitrification, typically occurring at ~−20 °C for unicellular organisms. Here, we show, through differential scanning calorimetry, that molar concentrations of magnesium perchlorate can depress the intracellular vitrification point of Bacillus subtilis cells to temperatures much lower than those previously reported. At 2.5 M Mg(ClO4)2, the peak vitrification temperature was lowered to −83 °C. Our results show that inorganic eutectic salts can in principle maintain liquid water in cells at much lower temperatures than those previously claimed as a lower limit to life, raising the prospects of active biochemical processes in low temperature natural settings. Our results may have implications for the habitability of Mars, where perchlorate salts are pervasive and potentially other terrestrial and extraterrestrial, cryosphere environments.

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Preservation of Bacillus subtilis’ cellular liquid state at deep sub-zero temperatures in perchlorate brines

Gault,

Fonseca,

Cockell

2024

Commun Biol

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show abstract

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Bacterial model membranes under the harsh subsurface conditions of Mars

Abstract: Biomembranes are an essential component of all living systems. Most research on membranes is restricted to ambient physiological conditions. However, the influence of extreme conditions, such as the deep subsurface...

Cited by 1 publication

References 47 publications

Preservation of Bacillus subtilis’ cellular liquid state at deep sub-zero temperatures in perchlorate brines

Preservation of Bacillus subtilis’ cellular liquid state at deep sub-zero temperatures in perchlorate brines

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