SNAPpa: A Photoactivatable SNAP-tag for the Spatiotemporal Control of Protein Labeling.

ABSTRACT: SNAP-tag is one of the most commonly used self-labeling protein tags for cell imaging studies. To achieve selective spatiotemporal imaging of cells, we set out to engineer a photoactivatable SNAP-tag. For this, we incorporated the well-established and readily available photocaged unnatural amino acid o-nitrobenzyl-O-tyrosine (ONBY) into all three tyrosine positions of SNAP. In-gel imaging analysis and fluorescence polarization measurements revealed that placing ONBY in position Y114 of the SNAP-tag facilitates the most effective and most efficient photoactivation of the irreversible self-labeling reaction with (sulfonated) benzyl guanine substrates, which is why we dubbed this photoactivatable SNPA-tag variant "SNAPpa". To demonstrated its potential for live-cell imaging, we

SUBMITTER: Mandl S 

PROVIDER: S-EPMC12308408 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature