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• W2075329412 startingPage "481" @default.
• W2075329412 abstract "In contrast to humans, who possess a hydroxysteroid sulfotransferase (HSST), namely, DHEA sulfotransferase (DHEA-ST), that displays broad substrate specificities, HSSTs of the guinea pig show a high substrate stereoselectivity, as shown by the recent cloning of a chiral-specific 3alpha-hydroxysteroid sulfotransferase. Herein, we report the cloning and expression of the substrate and chiral-specific pregnenolone sulfotransferase (PREG-ST). Transfection of the pCMV expression vector containing PREG-ST cDNA in transformed human embryonal kidney (293) cells showed that the expressed enzyme selectively catalyzes the 3beta-hydroxysteroid substrate. It converts pregnenolone to pregnenolone sulfate most efficiently, whereas dehydroepiandrosterone and epiandrosterone were transformed at a much lower rate, and androsterone, a 3alpha-hydroxysteroid, was not significantly metabolized (30-fold lower). Thus, the enzyme was identified as pregnenolone sulfotransferase. DNA analysis predicts a protein of 287 amino acids with a calculated molecular mass of 34,199 daltons. Alignment of the amino acid sequence with other sulfotransferases indicated that guinea pig pregnenolone sulfotransferase shares 75 and 80% homology with human DHEA sulfotransferase and rat hydroxysteroid dehydrogenase, respectively. RNA blot analysis using guinea pig liver, intestine, adrenal, kidney, epididymis, testis, and lung showed a single RNA species at 1.3 kb is expressed in liver, intestine, and kidney. Guinea pig 3beta-hydroxysteroid sulfotransferase is thus different from that in humans, who possess two mRNA species of 1.3 and 1.8 kb." @default.
• W2075329412 created "2016-06-24" @default.
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• W2075329412 date "1996-06-01" @default.
• W2075329412 modified "2023-10-16" @default.
• W2075329412 title "Isolation and Characterization of a Stereospecific 3β-Hydroxysteroid Sulfotransferase (Pregnenolone Sulfotransferase) cDNA" @default.
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• W2075329412 doi "https://doi.org/10.1089/dna.1996.15.481" @default.
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