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The multi-domain enzyme isocitrate dehydrogenase from the hyperthermophile Aeropyrum pernix was studied by denaturant-induced unfolding. At pH 7.5, changes in circular dichroism ellipticity and intrinsic fluorescence showed a complex unfolding transition, whereas at pH 3.0, an apparently two-state and highly reversible unfolding occurred. Analytical ultracentrifugation revealed the dissociation from...
Stability and function of a large number of proteins are crucially dependent on the presence of disulfide bonds. Recent genome analysis has pointed out an important role of disulfide bonds for the structural stabilization of intracellular proteins from hyperthermophilic archaea and bacteria. These findings contradict the conventional view that disulfide bonds are rare in those proteins. A specific...
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