Misrouting of v-ATPase subunit V0a1 dysregulates lysosomal acidification in a neurodegenerative lysosomal storage disease model

Maria B. Bagh (), Shiyong Peng, Goutam Chandra, Zhongjian Zhang, Satya P. Singh, Nagarajan Pattabiraman, Aiyi Liu and Anil B. Mukherjee ()
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Maria B. Bagh: Section on Developmental Genetics, PEMG, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health
Shiyong Peng: Section on Developmental Genetics, PEMG, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health
Goutam Chandra: Section on Developmental Genetics, PEMG, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health
Zhongjian Zhang: Section on Developmental Genetics, PEMG, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health
Satya P. Singh: Laboratory of Molecular Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health
Nagarajan Pattabiraman: MolBox LLC
Aiyi Liu: Biostatistics and Bioinformatics Branch, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health
Anil B. Mukherjee: Section on Developmental Genetics, PEMG, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health

Nature Communications, 2017, vol. 8, issue 1, 1-16

Abstract: Abstract Defective lysosomal acidification contributes to virtually all lysosomal storage disorders (LSDs) and to common neurodegenerative diseases like Alzheimer’s and Parkinson’s. Despite its fundamental importance, the mechanism(s) underlying this defect remains unclear. The v-ATPase, a multisubunit protein complex composed of cytosolic V1-sector and lysosomal membrane-anchored V0-sector, regulates lysosomal acidification. Mutations in the CLN1 gene, encoding PPT1, cause a devastating neurodegenerative LSD, INCL. Here we report that in Cln1−/− mice, which mimic INCL, reduced v-ATPase activity correlates with elevated lysosomal pH. Moreover, v-ATPase subunit a1 of the V0 sector (V0a1) requires palmitoylation for interacting with adaptor protein-2 (AP-2) and AP-3, respectively, for trafficking to the lysosomal membrane. Notably, treatment of Cln1−/− mice with a thioesterase (Ppt1)-mimetic, NtBuHA, ameliorated this defect. Our findings reveal an unanticipated role of Cln1 in regulating lysosomal targeting of V0a1 and suggest that varying factors adversely affecting v-ATPase function dysregulate lysosomal acidification in other LSDs and common neurodegenerative diseases.

Date: 2017
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DOI: 10.1038/ncomms14612

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