Covalent BTK degrader study challenges the need for catalytic turnover
Academic source · Nature Communications
Source published:
Site published: 2026-11-03 · Updated: 2026-11-03
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What changed
Researchers characterized PSIRC3, an irreversible covalent BTK PROTAC that produced rapid, selective degradation in cellular experiments and target reduction in vivo. Activity required engagement of BTK Cys481 and was lost against the C481S mutant. Modeling supported a balance between target and E3 ligase affinities, challenging the assumption that catalytic turnover is required for potent degradation.
Why it may matter
The work expands covalent degrader design options while underscoring mutation sensitivity and affinity-related hook effects as practical optimization constraints in preclinical discovery.
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