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• W1982600255 endingPage "4116" @default.
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• W1982600255 abstract "In peripheral target tissues, levels of active glucocorticoid hormones are controlled by 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1), a dimeric enzyme that catalyzes the reduction of cortisone to cortisol within the endoplasmic reticulum. Loss of this activity results in a disorder termed cortisone reductase deficiency (CRD), typified by increased cortisol clearance and androgen excess. To date, only mutations in H6PD, which encodes an enzyme supplying cofactor for the reaction, have been identified as the cause of disease. Here we examined the HSD11B1 gene in two cases presenting with biochemical features indicative of a milder form of CRD in whom the H6PD gene was normal. Novel heterozygous mutations (R137C or K187N) were found in the coding sequence of HSD11B1. The R137C mutation disrupts salt bridges at the subunit interface of the 11β-HSD1 dimer, whereas K187N affects a key active site residue. On expression of the mutants in bacterial and mammalian cells, activity was either abolished (K187N) or greatly reduced (R137C). Expression of either mutant in a bacterial system greatly reduced the yield of soluble protein, suggesting that both mutations interfere with subunit folding or dimer assembly. Simultaneous expression of mutant and WT 11β-HSD1 in bacterial or mammalian cells, to simulate the heterozygous condition, indicated a marked suppressive effect of the mutants on both the yield and activity of 11β-HSD1 dimers. Thus, these heterozygous mutations in the HSD11B1 gene have a dominant negative effect on the formation of functional dimers and explain the genetic cause of CRD in these patients." @default.
• W1982600255 created "2016-06-24" @default.
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• W1982600255 date "2011-02-15" @default.
• W1982600255 modified "2023-09-25" @default.
• W1982600255 title "Cortisone-reductase deficiency associated with heterozygous mutations in 11β-hydroxysteroid dehydrogenase type 1" @default.
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• W1982600255 doi "https://doi.org/10.1073/pnas.1014934108" @default.
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• W1982600255 hasPublicationYear "2011" @default.
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