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Titolo:
Osmotically induced intracellular trehalose, but not glycine betaine accumulation promotes desiccation tolerance in Escherichia coli
Autore:
Welsh, DT; Herbert, RA;
Indirizzi:
Univ Parma, Dipartimento Sci Ambientali, I-43100 Parma, Italy Univ Parma Parma Italy I-43100 ento Sci Ambientali, I-43100 Parma, Italy Univ Dundee, Dept Biol Sci, Dundee DD1 4HN, Scotland Univ Dundee Dundee Scotland DD1 4HN t Biol Sci, Dundee DD1 4HN, Scotland
Titolo Testata:
FEMS MICROBIOLOGY LETTERS
fascicolo: 1, volume: 174, anno: 1999,
pagine: 57 - 63
SICI:
0378-1097(19990501)174:1<57:OIITBN>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
SACCHAROMYCES-CEREVISIAE; COMPATIBLE SOLUTES; OSMOLYTES; BACTERIA; SURVIVAL; STRESS; ACID;
Keywords:
desiccation tolerance; trehalose; glycine betaine; osmoadaptation; stress resistance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Welsh, DT Univ Parma, Dipartimento Sci Ambientali, Viale Sci, I-43100 Parma, Italy Univ Parma Viale Sci Parma Italy I-43100 , I-43100 Parma, Italy
Citazione:
D.T. Welsh e R.A. Herbert, "Osmotically induced intracellular trehalose, but not glycine betaine accumulation promotes desiccation tolerance in Escherichia coli", FEMS MICROB, 174(1), 1999, pp. 57-63

Abstract

Trehalose considerably increased the tolerance of Escherichia coil to air drying, whether added as an excipient prior to drying or accumulated as a compatible solute in response to osmotic stress. The protective effect of exogenously added trehalose was concentration dependent, up to a threshold value of 350 mM. However, trehalose alone cannot explain the intrinsically greater desiccation tolerance of stationary compared to exponential phase E. coli cells, although their tolerance was also enhanced by exogenous or endogenously accumulated trehalose. In contrast, glycine betaine whether added as an excipient or accumulated intracellularly had no influence on desiccation tolerance. These data demonstrate that the protection provided by compatible solutes to cells subjected to desiccation differs from that during osmotic stress, due to the much greater reduction in available cell water. The protective effects of trehalose during: desiccation appear to be due to its stabilising influence on membrane structure? its chemically inert natureand the propensity of trehalose solutions to form glasses upon drying, properties which are not shared by glycine betaine. (C) 1999 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 01:37:05