haloalkaliphilic

Edge evidence

• saline soda lake environment provides high-salt environment

  Soda lakes combine salinity with alkaline chemistry.

  • DOI:10.1016/j.femsre.2004.10.005 alkaline sodium carbonate/bicarbonate fraction Review supports soda lakes as alkaline saline environments.
• saline soda lake environment provides alkaline pH

  Soda lake buffering maintains high pH.

  • DOI:10.1016/j.femsre.2004.10.005 stable, high-to-extremely high pH Supports persistent alkaline pH in haloalkaliphilic habitats.
• high-salt environment contributes to haloalkaliphilic RO:0002326

  Haloalkaliphiles require high-salt adaptation.

  • DOI:10.1021/pr060352q survive in salt-saturated lakes of pH 11 Natronomonas pharaonis proteomics paper supports combined salt and alkaline survival.
• alkaline pH contributes to haloalkaliphilic RO:0002326

  Haloalkaliphiles also require adaptation to high pH.

  • DOI:10.1021/pr060352q salt-saturated lakes of pH 11 Supports high-pH component of the haloalkaliphilic trait.
• compatible solutes contributes to haloalkaliphilic RO:0002326

  Compatible solutes support osmoadaptation in haloalkaliphiles.

  • DOI:10.1139/cjm-2014-0233 ectoine and glycine betaine Review supports compatible solutes as osmoadaptation mechanisms in haloalkaliphiles.
• alkaline pH homeostasis enables haloalkaliphilic RO:0002327

  pH homeostasis is required for growth under alkaline conditions.

  • DOI:10.1038/nrmicro2549 bacterial pH homeostasis is a cell-wide physiological process Review supports pH homeostasis as a physiological mechanism integrated with salinity and other factors.
• haloalkaliphilic can use compatible-solute (salt-out) strategy

  Haloalkaliphiles can osmoadapt via compatible-solute accumulation.

  • DOI:10.1038/s44185-024-00050-w Review: halophiles use two broad osmoadaptation strategies, including biosynthesis/accumulation of compatible solutes.
• haloalkaliphilic can use salt-in strategy

  Haloalkaliphiles can osmoadapt via the intracellular salt-in strategy.

  • DOI:10.1038/s44185-024-00050-w Review: halophiles use two broad osmoadaptation strategies, including the intracellular 'salt-in' strategy.
• Na+/H+ antiporter activity contributes to Na+ efflux and pH regulation RO:0002326

  Na+/H+ antiporters expel Na+ and help regulate intracellular pH.

  • DOI:10.3389/fmicb.2025.1550346 Na+/H+ antiporters (nhaA/B/C and the mnh complex) expel Na+ and help pH regulation; generalized mechanistic edge relevant to haloalkaliphiles.
• Na+ efflux and pH regulation enables alkaline pH homeostasis RO:0002327

  Sodium efflux coupled to proton import supports pH homeostasis under alkaline conditions.

  • DOI:10.3389/fmicb.2025.1550346 Na+/H+ antiport expels Na+ while helping pH regulation, supporting cytoplasmic pH homeostasis.
• compatible-solute (salt-out) strategy involves biosynthesis of ectoine

  Compatible-solute strategy includes ectoine biosynthesis/uptake.

  • DOI:10.3389/fmicb.2025.1550346 Salt-out strategy involved biosynthesis and uptake of compatible solutes including ectoine; strong for hypersaline adaptation broadly.
• choline oxidation pathway biosynthesizes glycine betaine

  Glycine betaine is produced de novo via the choline oxidation pathway.

  • DOI:10.1038/s44185-024-00050-w Review: de novo biosynthesis of glycine betaine via the choline oxidation pathway.