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Titolo:
MICROBIAL BEHAVIOR IN SALT-STRESSED ECOSYSTEMS
Autore:
GALINSKI EA; TRUPER HG;
Indirizzi:
UNIV BONN,INST MIKROBIOL & BIOTECHNOL,MECKENHEIMER ALLEE 168 D-53115 BONN GERMANY
Titolo Testata:
FEMS microbiology reviews
fascicolo: 2-3, volume: 15, anno: 1994,
pagine: 95 - 108
SICI:
0168-6445(1994)15:2-3<95:MBISE>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
HALOPHILIC PHOTOTROPIC BACTERIUM; SULFATE-REDUCING BACTERIUM; PURPLE SULFUR BACTERIUM; COMPATIBLE SOLUTES; GLYCINE BETAINE; ECTOTHIORHODOSPIRA-HALOCHLORIS; SP-NOV; OSMOTIC REGULATION; ESCHERICHIA-COLI; APHANOTHECE-HALOPHYTICA;
Keywords:
HALOPHILIC, HALOTOLERANT BACTERIA; COMPATIBLE SOLUTE; OSMOLYTE; OSMOADAPTATION; ENZYME STABILIZATION; STRESS PROTECTION; SYNTHESIS, UPTAKE, EXCRETION OF SOLUTES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
89
Recensione:
Indirizzi per estratti:
Citazione:
E.A. Galinski e H.G. Truper, "MICROBIAL BEHAVIOR IN SALT-STRESSED ECOSYSTEMS", FEMS microbiology reviews, 15(2-3), 1994, pp. 95-108

Abstract

Salt stress is primarily osmotic stress, and halophilic/halotolerant microorganisms have evolved two basic mechanisms of osmoadaptation: the KCl-type and the compatible-solute type, the latter representing a very flexible mode of adaptation making use of distinct stabilizing properties of compatible solutes. A comprehensive survey, using HPLC and NMR methods, has revealed the full diversity of eubacterial compatiblesolutes found in nature. With the exception of proline (a proteinogenic amino acid) they are characterized as amino acid derivatives of thefollowing types: betaines, ectoines, N-acetylated diamino acids and N-derivatized carboxamides of glutamine. From our present knowledge of biosynthetic pathways it appears that, apart from glycine betaine, allnitrogen-containing compatible solutes originate from two major pathways (the aspartate branch and the glutamate branch). Uptake of compatible solutes from the growth medium (environment) seems to have preference over de novo synthesis. Therefore, in the natural ecosystem the solutes of primary producers (mainly glycine betaine), which are readilyexcreted upon dilution stress, certainly play an important role as a 'preferred' solute source for heterotrophic organisms, and as a 'vital' source for organisms unable to synthesize their own compatible solutes.

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Documento generato il 22/09/20 alle ore 11:28:34