pressure delta

Edge evidence

• hydrostatic pressure defines pressure delta METPO:2007500

  The hydrostatic-pressure axis defines the values whose max minus min yields the delta.

  • DOI:10.3389/fmolb.2022.1058381 Pressure-adaptation review frames the breadth of the pressure-tolerance span as a derived descriptor of pressure-adaptation flexibility.
• pressure delta associated with pressure-tolerance breadth biolink:associated_with

  The delta encodes the breadth of pressure-tolerance flexibility.

  • DOI:10.1099/ijsem.0.001671 The 80-140 MPa span of Colwellia marinimaniae MTCD1 (delta = 60 MPa) illustrates the breadth this phenotype records.
• unsaturated fatty acid production enables membrane fluidity maintenance under high pressure RO:0002327

  Unsaturated acyl-chain production/desaturation sustains membrane fluidity under high hydrostatic pressure.

  • DOI:10.1186/s12864-020-07102-y All piezophiles encode a delta-9 acyl-phospholipid desaturase; unsaturated chains allow better adaptation to higher pressures (general HHP mechanism).
  • DOI:10.1021/acs.chemrev.3c00432 Membrane fluidity adjustment is a core pressure-adaptation node.
• hydrostatic pressure causes loss of membrane fluidity at high pressure biolink:causes

  High hydrostatic pressure compresses membranes and reduces fluidity.

  • DOI:10.3389/fmicb.2024.1293928 High pressure causes loss of membrane fluidity (cross-taxa physiological mechanism).
• loss of membrane fluidity at high pressure restricts pressure-tolerance breadth

  Loss of membrane fluidity limits growth at the upper pressure bound, narrowing the supported range.

  • DOI:10.1038/s43247-023-01045-4 Reduced membrane fluidity under HHP coincides with cessation of respiration/degradation, restricting the upper growth bound.
• hydrostatic pressure causes pressure-induced ribosome dissociation biolink:causes

  High pressure induces ribosome dissociation, suppressing translation and growth.

  • DOI:10.1038/s43247-023-01045-4 High pressure causes ribosome dissociation; translation/replication become dysfunctional, preventing growth and division.
• pressure-induced ribosome dissociation restricts pressure-tolerance breadth

  Translation failure from ribosome dissociation limits the growth-supporting pressure range.

  • DOI:10.1038/s43247-023-01045-4 Ribosome dissociation preventing growth and division narrows the pressure range over which growth is sustained.
• intracellular osmolytes / compatible solutes enables protein stabilization under pressure RO:0002327

  Intracellular osmolytes/cosolutes reinforce protein structure under high hydrostatic pressure.

  • DOI:10.1021/acs.chemrev.3c00432 Osmolytes reinforce the structure of proteins; cosolutes modulate biomolecular function under HHP (general mechanism).
• nuo NADH dehydrogenase I complex supports high-pressure respiratory energy conservation

  The nuo NADH dehydrogenase I complex supports respiratory energy conservation enabling growth under high pressure.

  • DOI:10.1186/s12864-020-07102-y nuo dehydrogenase operons present in piezophiles; respiratory-chain composition modulates pressure tolerance, a candidate contributor to wider high-pressure growth support.
• minimum and maximum growth pressure bounds defines pressure delta METPO:2007500

  The minimum and maximum growth-pressure limits define the breadth (max minus min) recorded by the delta.

  • DOI:10.1186/s12864-020-07102-y Range-bound examples (e.g., MTCD1 80-140 MPa => delta = 60 MPa) show min/max bounds defining the pressure-delta breadth descriptor.