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Titolo:
THE EFFECT OF NACL ON THE GROWTH OF A HALOMONAS SPECIES - ACCUMULATION AND UTILIZATION OF COMPATIBLE SOLUTES
Autore:
CUMMINGS SP; GILMOUR DJ;
Indirizzi:
UNIV SHEFFIELD,DEPT MOLEC BIOL & BIOTECHNOL,POB 594,FIRTH COURT,WESTERN BANK SHEFFIELD S10 2UH S YORKSHIRE ENGLAND UNIV SHEFFIELD,DEPT MOLEC BIOL & BIOTECHNOL SHEFFIELD S10 2UH S YORKSHIRE ENGLAND
Titolo Testata:
Microbiology
, volume: 141, anno: 1995,
parte:, 6
pagine: 1413 - 1418
SICI:
1350-0872(1995)141:<1413:TEONOT>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
BACTERIUM ECTOTHIORHODOSPIRA-HALOCHLORIS; GLYCINE BETAINE; HALOPHILIC EUBACTERIA; ESCHERICHIA-COLI; SALMONELLA-TYPHIMURIUM; SALT CONCENTRATION; OSMOTIC-STRESS; TRANSPORT; ROLES; OSMOREGULATION;
Keywords:
HALOMONAS; SODIUM; COMPATIBLE SOLUTES; GLYCINE BETAINE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
S.P. Cummings e D.J. Gilmour, "THE EFFECT OF NACL ON THE GROWTH OF A HALOMONAS SPECIES - ACCUMULATION AND UTILIZATION OF COMPATIBLE SOLUTES", Microbiology, 141, 1995, pp. 1413-1418

Abstract

The effect of NaCl on growth and compatible solute utilization was investigated in a Halomonas species. Growth of Halomonas was observed inmedium of low osmolarity (high water activity) when only 0.1 mM Na+ was present. However, lowering the water activity, by addition of KCl or sucrose, inhibited growth in this low-Na+ medium, but growth could be restored by the addition of NaCl. The bacterium could grow on glucose as the sole carbon source in up to 3.25 M NaCl and was shown also tometabolize glycine betaine. However NaCl concentrations greater than 2 M inhibited growth when glycine betaine was the sole carbon source. Glycine betaine was transported into the cells by a process stimulatedby NaCl irrespective of whether the carbon source was glucose or glycine betaine. Cytoplasmic levels of glycine betaine were monitored throughout the growth cycle in 2 M NaCl medium with glycine betaine as sole carbon source. As the culture aged, glycine betaine was increasinglyreplaced by the tetrahydropyrimidine ectoine as the major cytoplasmicsolute. The increased sensitivity to high NaCl concentrations when grown on glycine betaine may be due to the glycine betaine catabolic pathway enzymes being inhibited by the increasing external solute concentration.

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Documento generato il 28/11/20 alle ore 04:36:29