ArticleCell chemical biology2024
Bioluminescence assay of lysine deacylase sirtuin activity.
Article in Cell chemical biology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Lysine acylation can direct protein function, localization, and interactions. Sirtuins deacylate lysine toward maintaining cellular homeostasis, and their aberrant expression contributes to the pathogenesis of multiple conditions, including cancer. Measuring sirtuins' activity is essential to exploring their potential as therapeutic targets, but accurate quantification is challenging. We developed "SIRTify", a high-sensitivity assay for measuring sirtuin activity in vitro and in vivo. SIRTify is based on a split-version of the NanoLuc luciferase consisting of a truncated, catalytically inactive N-terminal moiety (LgBiT) that complements with a high-affinity C-terminal peptide (p86) to form active luciferase. Acylation of two lysines within p86 disrupts binding to LgBiT and abates luminescence. Deacylation by sirtuins reestablishes p86 and restores binding, generating a luminescence signal proportional to sirtuin activity. Measurements accurately reflect reported sirtuin specificity for lysine-acylations and confirm the effects of sirtuin modulators. SIRTify quantifies lysine deacylation dynamics and may be adaptable to monitoring additional post-translational modifications.
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