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  • Title: Inhibition of 3 alpha/beta,20 beta-hydroxysteroid dehydrogenase by dexamethasone, glycyrrhetinic acid and spironolactone is attenuated by deletion of 12 carboxyl-terminal residues.
    Author: Itoda M, Takase N, Nakajin S.
    Journal: Biol Pharm Bull; 2002 Sep; 25(9):1220-2. PubMed ID: 12230123.
    Abstract:
    We constructed a pig 3alpha/beta,20beta-hydroxysteroid dehydrogenase (3alpha/beta,20beta-HSD) mutant, which lacks 12 carboxyl-terminal amino acids residues. Enzyme activity studies indicated that the deleted amino acids have a role in steroid metabolism and may assist in substrate binding in wild-type 3alpha/beta,20beta-HSD. Furthermore, substrate binding likely induces a conformational change allowing the 12 carboxyl-terminal amino acids interact with the steroid substrate [Nakajin S. et al., Biochim. Biophys. Acta, 1550, 175-182 (2001)]. In this paper, we clarified that although pig 3alpha/beta,20beta-HSD is potently inhibited by dexamethasone, glycyrrhetinic acid and spironolactone, this inhibition is remarkably attenuated by deleting the 12 carboxyl-terminal residues. The inhibition constant (Ki) of pig 3alpha/beta,20beta-HSD for dexamethasone increased 115-fold. These observations also indicate that these amino acid residues interact with steroid substrates or steroid inhibitors and have an important role in substrate or inhibitor binding to the active site.
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