GBAviewer: a structural database of GBA1 variants in Parkinson's disease
Bayne, A. N.; Parlar, S. C.; Shahkhali, M. G.; Chebon-Bore, L.; Halder, P.; Gan-Or, Z.; Trempe, J.-F.
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Background: GBA1 variants are common risk factors for Parkinson's disease (PD), yet the structural consequences of most variants remain uncharacterized. No centralized resource currently integrates the growing number of GCase structures, compounds, and PD-associated variants. Objectives: To develop an interactive tool mapping GBA1-PD missense variants onto GCase structures, alongside interactors and therapeutic compounds. Methods: We built GBAviewer, an R/Shiny web server integrating GBA1-PD Browser variants with crystal structures, cryo-EM complexes, AlphaFold3 models, and AlphaMissense scores. We also modelled a putative GCase-Saposin C-glucosylceramide ternary complex using AlphaFold3. Results: GBAviewer maps variants in 3D across the GCase active site, LIMP-2 and SapC surfaces, chaperone pockets, and dimerization interface. Our ternary model corroborates SapC binding to the GCase active site entrance, where several variants of unknown significance cluster. Conclusions: GBAviewer is a freely accessible platform for structural analysis of GBA1 variants, supporting mechanistic studies and therapeutic development. Available at: https://g-can.shinyapps.io/GBAviewer/
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