Add time:08/26/2019         Source:sciencedirect.com

Adrenodoxin was purified from the rat adrenal gland. The A414A280 value of the purified rat adrenodoxin was 0.90 and the oxidized spectrum showed absorption maxima at 320, 414 and 455 nm, similar to those of bovine adrenodoxin. On SDS-PAGE, the rat adrenodoxin showed a single band with a molecular mass of 11.2 kDa, while the apparent molecular mass by gel filtration through Sephadex G-75 equilibrated with 10 mM K-phosphate (pH 7.5) was 27 kDa. In the reconstituted system, Vmax of NADPH-cytochrome c reduction activity and the Km for the rat adrenodoxin were much the same as those for recombinant bovine adrenodoxin. In the case of cholesterol side-chain cleavage activity, however, these values of the rat adrenodoxin were about half of those of the bovine adrenodoxin. The CD spectrum of the rat adrenodoxin was similar to that of the bovine adrenodoxin but showed a significantly lower ellipticity value in the 195–205 nm region than that of the bovine adrenodoxin. The structural differences may possibly explain differences in the enzymic properties between rat and bovine adrenodoxins.

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