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• W2171513807 abstract "Introduction: 3β-Hydroxysteroid dehydrogenase (3β-HSD) deficiency is a rare cause of congenital adrenal hyperplasia caused by inactivating mutations in the HSD3B2 gene. Most mutations are located within domains regarded crucial for enzyme function. The function of the C terminus of the 3β-HSD protein is not known. Objective: We studied the functional consequences of three novel C-terminal mutations in the 3β-HSD protein (p.P341L, p.R335X and p.W355X), detected in unrelated 46,XY neonates with classical 3β-HSD type II deficiency showing different degrees of under-virilization. Methods and Results:In vitro expression of the two truncated mutant proteins yielded absent conversion of pregnenolone and dehydroepiandrosterone (DHEA), whereas the missense mutation p.P341L showed a residual DHEA conversion of 6% of wild-type activity. Additional analysis of p.P341L, including three-dimensional protein modeling, revealed that the mutant’s inactivity predominantly originates from a putative structural alteration of the 3β-HSD protein and is further aggravated by increased protein degradation. The stop mutations cause truncated proteins missing the final G-helix that abolishes enzymatic activity irrespective of an augmented protein degradation. Genital appearance did not correlate with the mutants’ residual in vitro activity. Conclusions: Three novel C-terminal mutants of the HSD3B2 gene are responsible for classical 3β-HSD deficiency. The C terminus is essential for the enzymatic activity. However, more studies are needed to clarify the exact function of this part of the protein. Our results indicate that the genital phenotype in 3β-HSD deficiency cannot be predicted from in vitro 3β-HSD function alone." @default.
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• W2171513807 date "2008-04-01" @default.
• W2171513807 modified "2023-10-04" @default.
• W2171513807 title "Carboxyl-Terminal Mutations in 3β-Hydroxysteroid Dehydrogenase Type II Cause Severe Salt-Wasting Congenital Adrenal Hyperplasia" @default.
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• W2171513807 doi "https://doi.org/10.1210/jc.2007-1874" @default.
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