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To be or not to be a compatible solute: Bioversatility of mannosylglycerate and...
Empadinhas, Nuno; Costa, Milton S. daMannosylglycerate (MG) is an intracellular organic solute found in some red algae, and several thermophilic bacteria and hyperthermophilic archaea. Glucosylglycerate (GG) was identified at the reducing end of a polysaccharide from mycobacteria and in a free form in a very few mesophilic bacteria and halophilic archaea. MG has a genuine role in the osmoadaptation and possibly in thermal protection of many hyper/...
Organic solutes in Rubrobacter xylanophilus : the first example of di- myo -in...
Empadinhas, Nuno; Mendes, Vítor; Simões, Catarina; Santos, Maria; Mingote, Ana; Lamosa, Pedro; Santos, Helena; Costa, MiltonAbstract The thermophilic and halotolerant nature of Rubrobacter xylanophilus led us to investigate the accumulation of compatible solutes in this member of the deepest lineage of the Phylum Actinobacteria. Trehalose and mannosylglycerate (MG) were the major compounds accumulated under all conditions examined, including those for optimal growth. The addition of NaCl to a complex medium and a defined medium had...
Mannosylglycerate is essential for osmotic adjustment in Thermus thermophilus ...
Alarico, Susana; Empadinhas, Nuno; Mingote, Ana; Simões, Catarina; Santos, Maria; Costa, Milton daAbstract We disrupted the mpgS encoding mannosyl-3-phosphoglycerate synthase (MpgS) of Thermus thermophilus strains HB27 and RQ-1, by homologous recombination, to assess the role of the compatible solute mannosylglycerate (MG) in osmoadaptation of the mutants, to examine their ability to grow in NaCl-containing medium and to identify the intracellular organic solutes. Strain HB27 accumulated only MG when grown...
Diversity and biosynthesis of compatible solutes in hyper/thermophiles
Empadinhas, Nuno; Costa, Milton S. daThe accumulation of compatible solutes, either by uptake from the medium or by de novo synthesis, is a general response of microorganisms to osmotic stress. The diversity of compatible solutes is large but falls into a few major chemical categories, such as carbohydrates or their derivatives and amino acids or their derivatives. This review deals with compatible solutes found in thermophilic or hyperthermophili...
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