Brain-wide measurement of protein turnover with high spatial and temporal resolution

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bioRxiv. 2022 Nov 13;. doi: 10.1101/2022.11.12.516226

Brain-wide measurement of protein turnover with high spatial and temporal resolution Tillberg LabLavis LabSpruston LabSvoboda LabTool Translation Team (T3) Anatomy and HistologyIntegrative ImagingViral Tools

Mohar Boaz, Grimm Jonathan, Patel Ronak, Brown Timothy, Tillberg Paul, Lavis Luke, Spruston Nelson, Svoboda Karel

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Abstract

Cells regulate function by synthesizing and degrading proteins. This turnover ranges from minutes to weeks, as it varies across proteins, cellular compartments, cell types, and tissues. Current methods for tracking protein turnover lack the spatial and temporal resolution needed to investigate these processes, especially in the intact brain, which presents unique challenges. We describe a pulse-chase method (DELTA) for measuring protein turnover with high spatial and temporal resolution throughout the body, including the brain. DELTA relies on rapid covalent capture by HaloTag of fluorophores that were optimized for bioavailability in vivo. The nuclear protein MeCP2 showed brain region- and cell type-specific turnover. The synaptic protein PSD95 was destabilized in specific brain regions by behavioral enrichment. A novel variant of expansion microscopy further facilitated turnover measurements at individual synapses. DELTA enables studies of adaptive and maladaptive plasticity in brain-wide neural circuits.

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bioRxiv PrePrint https://doi.org/10.1101/2022.11.12.516226

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Brain-wide measurement of protein turnover with high spatial and temporal resolution

Abstract

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