Pressure as an environmental parameter for microbial life — A review

Picard, Aude; Daniel, Isabelle

doi:10.1016/j.bpc.2013.06.019

Cited by 100 publications

(106 citation statements)

References 154 publications

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“…In an effort to better understand the origin, evolution and extent of life, significant effort has gone into finding the limits of temperature, pressure, pH, salinity and other compositional and physical variables that define habitability (Rothschild and Mancinelli, 2001;Pikuta et al, 2007;Canganella and Wiegel, 2011;Colwell and D'Hondt, 2013;Picard and Daniel, 2013;Takai et al, 2014). However, one variable in particular-energy-has received much less attention (Amend and Teske, 2005;Shock and Holland, 2007;Hoehler and Jørgensen, 2013;LaRowe and Amend, 2015a, b).…”

Section: Introductionmentioning

confidence: 99%

The energetics of anabolism in natural settings

LaRowe

Amend

2016

The ISME Journal

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The environmental conditions that describe an ecosystem define the amount of energy available to the resident organisms and the amount of energy required to build biomass. Here, we quantify the amount of energy required to make biomass as a function of temperature, pressure, redox state, the sources of C, N and S, cell mass and the time that an organism requires to double or replace its biomass. Specifically, these energetics are calculated from 0 to 125°C, 0.1 to 500 MPa and − 0.38 to +0.86 V using CO 2 , acetate or CH 4 for C, NO 3 À or NH 4 þ for N and SO 4 2À or HS − for S. The amounts of energy associated with synthesizing the biomolecules that make up a cell, which varies over 39 kJ (g cell), are then used to compute energy-based yield coefficients for a vast range of environmental conditions. Taken together, environmental variables and the range of cell sizes leads to a~4 orders of magnitude difference between the number of microbial cells that can be made from a Joule of Gibbs energy under the most (5.06 × 10 11 cells J − 1) and least (5.21 × 10 7 cells J − 1 ) ideal conditions. When doubling/replacement time is taken into account, the range of anabolism energies can expand even further.

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Section: Introductionmentioning

confidence: 99%

The energetics of anabolism in natural settings

LaRowe

Amend

2016

The ISME Journal

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“…In spite of these recent advances, we still know little about how these microorganisms survive and grow under the prevailing conditions of the DHABs. For example, although microbial metabolism has been reported at high hydrostatic pressures -several orders of MPa- (Picard 2014), very little is known about the combined effect of anoxia and high pressure, and even less is known about the combined effects of anoxia, high pressure, and high ionic strength.…”

Section: Introductionmentioning

confidence: 99%

Inter-comparison of the potentially active prokaryotic communities in the halocline sediments of Mediterranean deep-sea hypersaline basins

et al. 2015

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The sediment microbiota of the Mediterranean deep--sea anoxic hypersaline basins (DHABs) are understudied relative to communities in the brines and halocline waters. In this study, the active fraction of the prokaryotic community in the halocline sediments of L' Atalante, Urania and Discovery DHABs was investigated based on extracted total RNA and 454 pyrosequencing of the 16S rRNA gene. Bacterial and archaeal communities were different in the sediments underlying the halocline waters of the three habitats, reflecting the unique chemical settings of each basin. The relative abundance of unique operational taxonomic units (OTUs) was also different between deep--sea control sediments and sediments underlying DHAB haloclines, suggesting adaptation to the steep DHAB chemical gradients. Only a few OTUs were affiliated to known bacterial halophilic and/or aerobic groups. Many OTUs, including some of the dominant ones, were related to aerobic taxa. Archaea were detected only in few halocline samples, with lower OTU richness relative to Bacteria, and were dominated by taxa associated with methane cycling. This study suggests that while metabolically active prokaryotic communities appear to be present in sediments underlying the three DHABs investigated, their diversity and activity are likely to be more reduced in sediments underlying the brines.3

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“…In addition, lipids play vital roles in cell signalling, and there is increasing evidence that the micromechanical properties of membranes can modulate the activity of proteins, peptides, channels and receptors embedded within them [13,14] It is known that the physical properties of lipid membranes are very sensitive to hydrostatic pressure and so it is also likely to significantly affect their function. Deep sea organisms, known as piezophiles or barophiles, must have mechanisms to adapt their lipid membranes to maintain their fluid bilayer structure and their mechanical properties under these extreme conditions [12,15].…”

Section: Introductionmentioning

confidence: 99%

High Pressure X-ray Studies of Lipid Membranes and Lipid Phase Transitions

Brooks

Seddon

2014

Zeitschrift Für Physikalische Chemie

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Hydrostatic pressure has dramatic effects on biomembrane structure and stability and is a key thermodynamic parameter in the context of the biology of deep sea organisms. Furthermore, high-pressure and pressure-jump studies are very useful tools in biophysics and biotechnology, where they can be used to study the mechanism and kinetics of lipid phase transitions, biomolecular transformations, and protein folding/unfolding. Here, we first give an overview of the technology currently available for X-ray scattering studies of soft matter systems under pressure. We then illustrate the use of this technology to study a variety of lipid membrane systems.

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Pressure as an environmental parameter for microbial life — A review

Cited by 100 publications

References 154 publications

The energetics of anabolism in natural settings

The energetics of anabolism in natural settings

Inter-comparison of the potentially active prokaryotic communities in the halocline sediments of Mediterranean deep-sea hypersaline basins

High Pressure X-ray Studies of Lipid Membranes and Lipid Phase Transitions

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