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Titolo:
GLYCINE BETAINE TRANSPORT IN A HALOTOLERANT CHROMATIUM SPECIES
Autore:
WELSH DT; HERBERT RA;
Indirizzi:
UNIV DUNDEE,DEPT BIOL SCI DUNDEE DD1 4HN SCOTLAND
Titolo Testata:
FEMS microbiology letters
fascicolo: 1, volume: 128, anno: 1995,
pagine: 27 - 32
SICI:
0378-1097(1995)128:1<27:GBTIAH>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
BINDING-PROTEIN; CYANOBACTERIA; STRESS;
Keywords:
COMPATIBLE SOLUTE; GLYCINE BETAINE TRANSPORT; OSMOADAPTATION; CHROMATIUM SP; PURPLE SULFUR BACTERIA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
D.T. Welsh e R.A. Herbert, "GLYCINE BETAINE TRANSPORT IN A HALOTOLERANT CHROMATIUM SPECIES", FEMS microbiology letters, 128(1), 1995, pp. 27-32

Abstract

The addition of 1 mM glycine betaine to the growth medium of Chromatium sp. NCIMB 8379 relieved growth inhibition caused by exposure to supra-optimal NaCl concentrations. Intracellular glycine betaine concentrations were dependent upon the NaCl concentration of the growth mediumup to 3 M exogenous NaCl. Kinetic data for the accumulation of [methyl-C-14]-glycine betaine demonstrated that Chromatium sp. NCIMB 8379 possesses a constitutively expressed active transport system for glycinebetaine. The transport system was saturable with respect to glycine betaine concentration and exhibited typical Michaelis-Menten type kinetics: K-m = 24 mu M, V-max = 306 nmol min(-1) mg protein(-1) at an external NaCl concentration of 1 M. The rate of glycine betaine transport decreased progressively with increasing growth medium NaCl concentration. This transport system may represent an adaptive response to growthin high osmolarity environments in this halotolerant isolate, allowing accumulation of glycine betaine from the external cell environment or recycling synthesised glycine betaine which has passively diffused from the cell.

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Documento generato il 02/10/20 alle ore 01:56:38