Skip to main content
Dryad logo

Data for: Screening of stapled peptides for inhibition of calcium-triggered exocytosis

Citation

Brunger, Axel et al. (2022), Data for: Screening of stapled peptides for inhibition of calcium-triggered exocytosis, Dryad, Dataset, https://doi.org/10.5061/dryad.x3ffbg7mp

Abstract

The so-called primary interface between the SNARE complex and synaptotagmin-1 (Syt1) is essential for Ca2+-triggered neurotransmitter release in neuronal synapses. The interacting residues of the primary interface are conserved across different species for synaptotagmins (Syt1, Syt2, Syt9), SNAP-25, and syntaxin-1A homologs involved in fast synchronous release. This Ca2+-independent interface forms prior to Ca2+-triggering and plays a role in synaptic vesicle priming. This primary interface is also conserved in the fusion machinery, that is, responsible for mucin granule membrane fusion. Ca2+ stimulated mucin secretion is mediated by the SNAREs syntaxin-3, SNAP-23, VAMP8, synaptotagmin-2, and other proteins. Here, we designed and screened a series of hydrocarbon-stapled peptides consisting of SNAP-25 fragments that included some of the key residues involved in the primary interface as observed in high-resolution crystal structures. We selected a subset of four stapled peptides that were highly α-helical as assessed by circular dichroism and that inhibited both Ca2+-independent and Ca2+-triggered ensemble lipid-mixing with neuronal SNAREs and Syt1. In a single-vesicle content-mixing assay with reconstituted neuronal SNAREs and synaptotagmin-1 or with reconstituted airway SNAREs and synaptotagmin-2, the selected peptides also suppressed Ca2+-triggered fusion. Taken together, hydrocarbon-stapled peptides that interfere with the primary interface consequently inhibit Ca2+-triggered exocytosis. Our inhibitor screen suggests that these compounds may be useful to combat mucus hypersecretion, that is, a major cause of airway obstruction in the pathophysiology of asthma and cystic fibrosis.

Methods

See Methods in Lai, Y., et al. (2022). Inhibition of Ca2+-triggered secretion by hydrocarbon-stapled peptides. Nature, 1–65. doi:10.1038/s41586-022-04543-1 and in Lai, Y., et al., Frontiers in Pharmacology, https://doi.org/10.3389/fphar.2022.891041 (2022).

Usage Notes

See README files for instructions. For a quick look, you can use ImageJ to inspect the .tif files, and any text editor or spreadsheet program to inspect the .txt files.

Funding

National Institutes of Health, Award: R37MH63105

National Institutes of Health, Award: HL129795

National Institutes of Health, Award: AI137319

Cystic Fibrosis Foundation, Award: DICKEY18G0

Cystic Fibrosis Foundation, Award: DICKELY19P0