NDLI: Gluconeotrehalose is the principal organic solute in the psychrotolerant bacterium Carnobacterium strain 17-4

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Gluconeotrehalose is the principal organic solute in the psychrotolerant bacterium Carnobacterium strain 17-4

Content Provider	Springer Nature Link
Author	Lamosa, Pedro Mingote, Ana I. Groudieva, Tatiana Klippel, Barbara Egorova, Ksenia Jabbour, Dina Santos, Helena Antranikian, Garabed
Copyright Year	2011
Abstract	A high proportion of microorganisms that colonise cold environments originate from marine sites; hence, they must combine adaptation to low temperature with osmoregulation. However, little or nothing is known about the nature of compatible solutes used by cold-adapted organisms to balance the osmotic pressure of the external medium. We studied the intracellular accumulation of small organic solutes in the Arctic isolate Carnobacterium strain 17-4 as a function of the growth temperature and the NaCl concentration in the medium. Data on 16S rDNA sequence and DNA–DNA hybridisation tests corroborate the assignment of this isolate as a new species of the bacterial genus Carnobacterium. The growth profiles displayed maximal specific growth rate at 30°C in medium without NaCl, and maximal values of final biomass at growth temperatures between 10 and 20°C. Therefore, Carnobacterium strain 17-4 exhibits halotolerant and psychrotolerant behaviours. The solute pool contained glycine-betaine, the main solute used for osmoregulation, and an unknown compound whose structure was identified as α-glucopyranosyl-(1-3)-β-glucopyranosyl-(1-1)-α-glucopyranose (abbreviated as gluconeotrehalose), using nuclear magnetic resonance and mass spectrometry. This unusual solute consistently accumulated to high levels (0.35 ± 0.05 mg/mg cell protein) regardless of the growth temperature or salinity. The efficiency of gluconeotrehalose in the stabilisation of four model enzymes against heat damage was also assessed, and the effects were highly protein dependent. The lack of variation in the gluconeotrehalose content observed under heat stress, osmotic stress, and starvation provides no clue for the physiological role of this rare solute.
Starting Page	463
Ending Page	472
Page Count	10
File Format	PDF
ISSN	14310651
Journal	Extremophiles
Volume Number	15
Issue Number	4
e-ISSN	14334909
Language	English
Publisher	Springer Japan
Publisher Date	2011-04-21
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cold-adapted bacterium Osmoregulation α,β-Trehalose Enzyme stabilisation Trisaccharide Biotechnology Microbiology Ecology
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Medicine Microbiology

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