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Titolo:
Combined effect of the growth temperature and salinity of the medium on the accumulation of compatible solutes by Rhodothermus marinus and Rhodothermus obamensis
Autore:
Silva, Z; Borges, N; Martins, LO; Wait, R; da Costa, MS; Santos, H;
Indirizzi:
Univ Nova Lisboa, Inst Tecnol Quim & Biol, P-2780 Oeiras, Portugal Univ Nova Lisboa Oeiras Portugal P-2780 & Biol, P-2780 Oeiras, Portugal Univ Coimbra, P-3000 Coimbra, Portugal Univ Coimbra Coimbra Portugal P-3000 v Coimbra, P-3000 Coimbra, Portugal Publlandh Lab Serv, Ctr Appl Microbiol & Res, Salisbury SP4 0JG, Wilts, Eng Publ Hlth Lab Serv Salisbury Wilts England SP4 0JG ry SP4 0JG, Wilts, Eng
Titolo Testata:
EXTREMOPHILES
fascicolo: 2, volume: 3, anno: 1999,
pagine: 163 - 172
SICI:
1431-0651(199905)3:2<163:CEOTGT>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
MYO-INOSITOL-PHOSPHATE; MASS-SPECTROMETRY; STRESS; BACTERIA; DI-MYO-INOSITOL-1,1'-PHOSPHATE; MANNOSYLGLYCERATE; ARCHAEA; C-13;
Keywords:
compatible solutes; osmoadaptation; thermoadaptation; alpha-mannosylglycerate; alpha-mannosylglyceramide; Rhodothermus marinus; Rhodothermus obamensis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Santos, H Univ127,a Lisboa, Inst Tecnol Quim & Biol, Rua da Quinta Grande 6,Apartado Univ Nova Lisboa Rua da Quinta Grande 6,Apartado 127 Oeiras Portugal P-2780
Citazione:
Z. Silva et al., "Combined effect of the growth temperature and salinity of the medium on the accumulation of compatible solutes by Rhodothermus marinus and Rhodothermus obamensis", EXTREMOPHIL, 3(2), 1999, pp. 163-172

Abstract

In this study we propose revised structures for the two major compatible solutes of Rhodothermus marinus. We have also examined the accumulation of compatible solutes by the type strains of the slightly halophilic and thermophilic species Rhodothermus marinus and Rhodothermus obamensis at several growth temperatures and salinities. The major solutes of R. marinus were identified as alpha-mannosylglycerate (alpha-MG) and alpha-mannosylglyceramide(alpha-MGA), whereas R. obamensis accumulated only alpha-mannosylglycerate. The total osmolyte content was higher during the early exponential phase and decreased abruptly as growth continued into the stationary phase. At low growth temperatures, R. marinus responded to water stress by accumulationof alpha-mannosylglycerate and its amide, in addition to low levels of trehalose, glutamate, and glucose. At the highest growth temperature, alpha-mannosylglycerate was the major compatible solute and alpha-mannosylglyceramide was not detected. When both compounds were present, an increase in the salinity of the growth medium favored the accumulation of alpha-mannosylglyceramide over alpha-mannosylglycerate. The absence of alpha-mannosylglyceramide in R. obamensis at all growth temperatures and salinities constituted the most pronounced difference in the profiles of compatible solute accumulation by the two strains. Trehalose was also a prominent solute in this organism. Both organisms accumulated higher levels of alpha-mannosylglycerate as the temperature was raised. The importance of the two compounds in the mechanisms of thermoadaptation and osmoadaptation is discussed.

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Documento generato il 22/09/20 alle ore 10:32:11