Expression and reconstitution of Calcineurin A and B subunits
1997
Calcineurin consists of two subunits, a catalytic A subunit of 60 kDa and a regulatory B subunit of 19 kDa. Both the A and B subunits of rat brain calcineurin were expressed in E. coli. The B subunit was readily overexpressed in the pET-21 a vector with yields of >70 mg of purified B subunit per 1 culture, representing >17% of the soluble E. coli protein. About 8 mg of purified A subunit was obtained. The enzyme activities of the A-subunit and the reconstituted AB complex were found to be comparable to that of the bovine brain enzyme. The reconstitution of the AB complex was studied and shown to be rapid.
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