Journal
RARE DISEASES
Volume 4, Issue 1, Pages -Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21675511.2016.1241363
Keywords
ERAD; Greenberg skeletal dysplasia; laminopathy; nuclear envelope; PelgerHuet anomaly; proteasome; protein quality control; sterol C14 reductase; sterol metabolism; ubiquitin
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Funding
- NIH [1R01GM11440101A1]
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Lamin B Receptor (LBR) is an inner nuclear membrane protein associated with the rare human diseases Pelger-Huet anomaly and Greenberg skeletal dysplasia. A new study has used CRISPR/ Cas9-mediated genetic manipulations in a human cell system to determine that the molecular etiology of these previously poorly understood disorders is a defect in cholesterol synthesis due to loss of LBR-associated sterol C14 reductase activity. The study furthermore determined that diseaseassociated LBR point mutations reduce sterol C14 reductase activity by decreasing the affinity of LBR for the reducing agent NADPH. Moreover, two disease-associated LBR truncation mutants were found to be highly unstable at the protein level and are rapidly turned over by a novel nuclear membrane-based protein quality control pathway. Thus, truncated LBR variants can now be used as model substrates for further investigations of nuclear protein quality control to uncover possible implications for other disease-associated nuclear envelopathies.
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