| Autor: |
Javanshad R; Department of Chemistry, University of Illinois Chicago, Chicago, Illinois 60607, United States., Nguyen TTA; Department of Chemistry, University of Illinois Chicago, Chicago, Illinois 60607, United States., Azaria RD; Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan 48109, United States., Li W; Department of Chemistry, University of Illinois Chicago, Chicago, Illinois 60607, United States., Edmison D; Department of Anatomy and Cell Biology, University of Illinois Chicago, Chicago, Illinois 60612, United States., Gong LW; Department of Biological Sciences, University of Illinois Chicago, Chicago, Illinois 60607, United States., Gowrishankar S; Department of Anatomy and Cell Biology, University of Illinois Chicago, Chicago, Illinois 60612, United States., Lieberman AP; Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan 48109, United States., Schultz ML; Stead Family Department of Pediatrics, University of Iowa, Iowa City, Iowa 52242, United States., Cologna SM; Department of Chemistry, University of Illinois Chicago, Chicago, Illinois 60607, United States. |
| Abstrakt: |
NPC intracellular cholesterol transporter 1 (NPC1) is a multipass, transmembrane glycoprotein mostly recognized for its key role in facilitating cholesterol efflux. Mutations in the NPC1 gene result in Niemann-Pick disease, type C (NPC), a fatal, lysosomal storage disease. Due to the progressively expanding implications of NPC1-related disorders, we investigated endogenous NPC1 protein-protein interactions in the mouse cortex and human-derived iPSCs neuronal models of the disease through coimmunoprecipitation-coupled with LC-MS based proteomics. The current study investigated protein-protein interactions specific to the wild-type and the most prevalent NPC1 mutation (NPC1 I1061T ) while filtering out any protein interactor identified in the Npc1 -/- mouse model. Additionally, the results were matched across the two species to map the parallel interactome of wild-type and mutant NPC1 I1061T . Most of the identified wild-type NPC1 interactors were related to cytoskeleton organization, synaptic vesicle activity, and translation. We found many putative NPC1 interactors not previously reported, including two SCAR/WAVE complex proteins that regulate ARP 2/3 complex actin nucleation and multiple membrane proteins important for neuronal activity at synapse. Moreover, we identified proteins important in trafficking specific to wild-type and mutant NPC1 I1061T . Together, the findings are essential for a comprehensive understanding of NPC1 biological functions in addition to its classical role in sterol efflux. |
