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Appl. Environ. Microbiol., Oct 1997, 4020-4025, Vol 63, No. 10
A Ramos, NDH Raven, RJ Sharp, S Bartolucci, M Rossi, R Cannio, J Lebbink, J Van Der Oost, WM De Vos and H Santos
2-O-(beta)-Mannosylglycerate, a solute that accumulates in some
(hyper)thermophilic organisms, was purified from Pyrococcus furiosus cells,
and its effect on enzyme stabilization in vitro was assessed. Enzymes from
hyperthermophilic, thermophilic, and mesophilic sources were examined. The
thermostabilities of alcohol dehydrogenases from P. furiosus and Bacillus
stearothermophilus and of glutamate dehydrogenases from Thermotoga maritima
and Clostridium difficile were improved to a significant extent when enzyme
solutions were incubated at supraoptimal temperatures in the presence of
2-O-(beta)-mannosylglycerate, but no effect on the thermostability of
glutamate dehydrogenase from P. furiosus was detected. On the other hand,
there was a remarkable effect on the thermal stabilities of rabbit muscle
lactate dehydrogenase, baker's yeast alcohol dehydrogenase, and bovine
liver glutamate dehydrogenase, which were used as model systems to evaluate
stabilization of enzymes of mesophilic origin. For all of the enzymes
examined and at the highest temperatures tested,
2-O-(beta)-mannosylglycerate was a better thermoprotectant than trehalose.
The stabilizing effect exerted by 2-O-(beta)-mannosylglycerate on enzymes
suggests a role for this compound as a protein thermostabilizer under
physiological conditions. 2-O-(beta)-Mannosylglycerate was also effective
in the protection of enzymes against stress imposed by freeze-drying, with
its protecting effect being similar to or better than that exerted by
trehalose. The data show 2-O-(beta)-mannosylglycerate to be a potential
enzyme stabilizer in biotechnological applications.
Copyright © 1997, American Society for Microbiology
Stabilization of Enzymes against Thermal Stress and Freeze-Drying by Mannosylglycerate
Instituto de Tecnologia Quimica e Biologica, ITQB/UNL, Oeiras, Portugal; Centre for Applied Microbiology and Research, Porton Down, Salisbury, United Kingdom; Dip. Chimica Organica e Biologica, Universita di Napoli, Napoli, Italy; and Department of Microbiology, Agricultural University of Wageningen, Wageningen, The Netherlands
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