A Fixable Fluorescence‐Quenched Substrate for Quantitation of Lysosomal Glucocerebrosidase Activity in Both Live and Fixed Cells

Author:

Zhu Sha1ORCID,Deen Matthew C.1ORCID,Zhu Yanping2ORCID,Gilormini Pierre‐André1ORCID,Chen Xi1,Davis Oliver B.3ORCID,Chin Marcus Y.3ORCID,Henry Anastasia G.3ORCID,Vocadlo David J.12ORCID

Affiliation:

1. Department of Chemistry Simon Fraser University Burnaby British Columbia V5A 1S6 Canada

2. Department of Molecular Biology and Biochemistry Simon Fraser University Burnaby British Columbia V5A 1S6 Canada

3. Denali Therapeutics Inc. 161 Oyster Point Blvd. South San Francisco CA 94080 USA

Abstract

AbstractFluorogenic substrates are emerging tools that enable studying enzymatic processes within their native cellular environments. However, fluorogenic substrates that function within live cells are generally incompatible with cellular fixation, preventing their tandem application with fundamental cell biology methods such as immunocytochemistry. Here we report a simple approach to enable the chemical fixation of a dark‐to‐light substrate, LysoFix‐GBA, which enables quantification of glucocerebrosidase (GCase) activity in both live and fixed cells. LysoFix‐GBA enables measuring responses to both chemical and genetic perturbations to lysosomal GCase activity. Further, LysoFix‐GBA permits simple multiplexed co‐localization studies of GCase activity with subcellular protein markers. This tool will aid studying the role of GCase activity in Parkinson's Disease, creating new therapeutic approaches targeting the GCase pathway. This approach also lays the foundation for an approach to create fixable substrates for other lysosomal enzymes.

Funder

Natural Sciences and Engineering Research Council of Canada

Michael J. Fox Foundation for Parkinson's Research

Denali Therapeutics

Canada Research Chairs

Publisher

Wiley

Subject

General Chemistry,Catalysis

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