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bioRxiv · 10.1101/2022.04.13.488185

Spatiotemporal proximity labeling tools to track GlcNAc sugar-modified functional protein hubs during cellular signaling

Liu, Y.·Nelson, Z. M.·Reda, A.·Fehl, C.
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Abstract

A fundamental mechanism that all eukaryotic cells use to adapt to their environment is dynamic protein modification with monosaccharide sugars. In humans, O-linked N-acetylglucosamine (O-GlcNAc) is rapidly added to and removed from diverse protein sites as a response to fluctuating nutrient levels, stressors, and signaling cues. Two aspects remain challenging for tracking functional O-GlcNAc events with chemical strategies: spatial control over subcellular locations and time control during labeling. The objective of this study was to create intracellular proximity labeling tools to identify functional changes in O-GlcNAc patterns with spatiotemporal control. We developed a labeling strategy based on the TurboID proximity labeling system for rapid protein biotin conjugation that we directed to O-GlcNAc protein modifications inside cells, a set of tools we called "GlycoID." Localized variants to the nucleus and cytosol, nuc-GlycoID and cyt-GlycoID, labeled O-GlcNAc proteins and their interactomes in subcellular space. Labeling during insulin as well as serum stimulation revealed functional changes in O-GlcNAc proteins as soon as 30 minutes of signaling. We demonstrated using proteomic analysis that the GlycoID strategy captured O-GlcNAcylated "activity hubs" consisting of O-GlcNAc proteins and their associated protein-protein interactions. The ability to follow changes in O-GlcNAc hubs during physiological events like insulin stimulation poises these tools to be used for determining mechanisms of glycobiological cell regulation. Our functional O-GlcNAc datasets in human cells will be a useful resource for O-GlcNAc-driven mechanisms. O_FIG O_LINKSMALLFIG WIDTH=200 HEIGHT=116 SRC="FIGDIR/small/488185v1_ufig1.gif" ALT="Figure 1"> View larger version (30K): org.highwire.dtl.DTLVardef@dbfde0org.highwire.dtl.DTLVardef@f8a27eorg.highwire.dtl.DTLVardef@17430f5org.highwire.dtl.DTLVardef@13a3e30_HPS_FORMAT_FIGEXP M_FIG C_FIG

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Liu, Y., Nelson, Z. M., Reda, A., Fehl, C.. 2022-04-13. Spatiotemporal proximity labeling tools to track GlcNAc sugar-modified functional protein hubs during cellular signaling. https://doi.org/10.1101/2022.04.13.488185

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