Abstract
The influence of the amino-acid substitution Arg486Cys on the conformational stability of recombinant cytochrome P450 7B1 (CYP7B1, oxysterol 7α-hydroxylase) was studied. The single base change was shown to decrease the free energy of the transition of the heme-protein from its native state to a denatured one, which pointed to a lower thermodynamic stability for the mutant form of the enzyme. This could be the cause of the metabolic disruption of neurosteroids and, as a consequence, the appearance of neurodegenerative diseases.
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