Implications of graded reductions in CLN6’s anti-aggregate activity for the development of the neuronal ceroid lipofuscinoses
| Autor: | Yuki Shiro, Yuri Hiraki, Arisa Yamashita, Tetsuo Yamazaki, Takatoshi Yujiri |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Mutant Biophysics Disease Protein aggregation Biology Biochemistry Pathogenesis 03 medical and health sciences 0302 clinical medicine Neuronal Ceroid-Lipofuscinoses Kufs Humans Molecular Biology Gene chemistry.chemical_classification Endoplasmic reticulum Membrane Proteins NCL Cell Biology CLN6 Cell biology Amino acid 030104 developmental biology Amino Acid Substitution ER chemistry 030220 oncology & carcinogenesis Mutation Function (biology) HeLa Cells |
| Zdroj: | Biochemical and Biophysical Research Communications. 525:883-888 |
| ISSN: | 0006-291X |
| DOI: | 10.1016/j.bbrc.2020.03.019 |
| Popis: | CLN6, spanning the endoplasmic reticulum transmembrane, is a protein of unknown function. Mutations in the CLN6 gene are linked to an autosomal recessively inherited disorder termed CLN6 disease, classified as a form of the neuronal ceroid lipofuscinoses (NCL). The pathogenesis of CLN6 disease remains poorly understood due to a lack of information about physiological roles CLN6 plays. We previously demonstrated that CLN6 has the ability to prevent protein aggregate formation, and thus hypothesized that the abrogation of CLN6’s anti-aggregate activity underlies the development of CLN6 disease. To test this hypothesis, we narrowed down the region vital for CLN6’s anti-aggregate activity, and subsequently investigated if pathogenic mutations within the region attenuate CLN6’s anti-aggregate activity toward four aggregation-prone αB-crystallin (αBC) mutants. None of the four αBC mutants was prevented from aggregating by the Arg106ProfsX truncated CLN6 mutant, the human counterpart of the nclf mutant identified in a naturally occurring mouse model of late infantile-onset CLN6 disease. In contrast, the Arg149Cys and the Arg149His CLN6 mutants, both associated with adult-onset CLN6 disease, blocked aggregation of two out of and all of the four αBC mutants, respectively, indicating that CLN6’s anti-aggregate activity is differentially modulated according to the substitution pattern at the same amino acid position. Collectively, we here propose that the graded reduction in CLN6’s anti-aggregate activity governs the clinical course of late infantile- and adult- onset NCL. |
| Databáze: | OpenAIRE |
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