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Titolo:
TURGOR REGULATION IN A NOVEL HALOMONAS SPECIES
Autore:
CUMMINGS SP; WILLIAMSON MP; GILMOUR DJ;
Indirizzi:
UNIV WALES COLL CARDIFF,DEPT BIOCHEM CARDIFF CF1 3AT WALES UNIV SHEFFIELD,DEPT MOLEC BIOL & BIOTECHNOL SHEFFIELD S10 2UH ENGLAND
Titolo Testata:
Archives of microbiology
fascicolo: 4, volume: 160, anno: 1993,
pagine: 319 - 323
SICI:
0302-8933(1993)160:4<319:TRIANH>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
ESCHERICHIA-COLI; HALOPHILIC EUBACTERIA; POTASSIUM-TRANSPORT; COMPATIBLE SOLUTES; BETAINE TRANSPORT; ACCUMULATION; GENE;
Keywords:
HALOMONAS SPC1; TURGOR REGULATION; INORGANIC AND ORGANIC COMPATIBLE SOLUTE ACCUMULATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
S.P. Cummings et al., "TURGOR REGULATION IN A NOVEL HALOMONAS SPECIES", Archives of microbiology, 160(4), 1993, pp. 319-323

Abstract

The mechanisms by which a novel eubacterium, identified as belonging to the genus Halomonas, adapted to increases in the extracellular osmotic potential were investigated. It was shown that the ability of the bacterium to grow after hyperosmotic shock was dependent on the presence of potassium ions. Growth of the bacterium in 2 M NaCl medium couldbe limited by low concentrations of K+ and this enabled the affinity for K+ to be determined (K(s) = 21.5 muM). Rubidium salts could be substituted for those of potassium, but the lowest concentration of Rb+ that allowed growth in 2 M NaCl medium was 50-fold greater than the minimum concentration of K+. C-13-NMR spectroscopy and HPLC analysis wereused to demonstrate the accumulation of organic solutes in the cytoplasm after exposure to high salinities. The major osmolyte was ectoine,but glutamate and ectoine hydroxide were also present. Addition of exogenous glycine betaine to 3.25 M NaCl medium resulted in the accumulation of high intracellular concentrations of glycine betaine in the bacterium. This reduced the level of ectoine accumulation but did not fully inhibit the synthesis of this compound in the cytoplasm.

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Documento generato il 28/11/20 alle ore 04:41:02