Extremophiles

, Volume 12, Issue 1, pp 125–131

Dihydroxyacetone metabolism in Salinibacter ruber and in Haloquadratum walsbyi

Original Paper

DOI: 10.1007/s00792-007-0114-x

Cite this article as:
Elevi Bardavid, R. & Oren, A. Extremophiles (2008) 12: 125. doi:10.1007/s00792-007-0114-x

Abstract

The extremely halophilic bacterium Salinibacter ruber inhabits saltern crystallizer ponds worldwide, together with the square archaeon Haloquadratum walsbyi. Cultures of Salinibacter have been shown to convert up to 20% of the glycerol added to a not previously characterized overflow product. We here identify this product of incomplete glycerol oxidation by Salinibacter as dihydroxyacetone. Genomic information suggests that H. walsbyi possesses an efficient uptake system for dihydroxyacetone, and we show here that dihydroxyacetone is indeed metabolized by Haloquadratum cultures, as well as by the heterotrophic prokaryotic community of the saltern crystallizer ponds in Eilat, Israel, dominated by Haloquadratum-like cells. In the absence of glycerol, Salinibacter also takes up dihydroxyacetone. Degradation of glycerol, produced in hypersaline lakes as an osmotic solute by the green alga Dunaliella salina may thus involve dihydroxyacetone as an intermediate, which can then be taken up by different types of heterotrophs present in the environment.

Keywords

SalinibacterHaloquadratumDihydroxyacetoneGlycerolIncomplete oxidation

Abbreviations

DHA

dihydroxyacetone

PQQ

pyrroloquinoline quinone

Copyright information

© Springer 2007

Authors and Affiliations

  1. 1.The Institute of Life Sciences, and The Moshe Shilo Minerva Center for Marine BiogeochemistryThe Hebrew University of JerusalemJerusalemIsrael
  2. 2.Department of Plant and Environmental Sciences, The Institute of Life SciencesThe Hebrew University of JerusalemJerusalemIsrael