How do researchers detect sensor cleavage events?

A broader sensor-design view emphasizes indirect and amplified signatures rather than observing the peptide bond itself. Cleavage may be inferred from separated tags, reporter release, trans-cleavage of collateral substrates, or the termini of products presented to another molecular system. These approaches can improve sensitivity or throughput, but the signal requires careful interpretation because it is one or more steps removed from the cleavage event.

• Synthetic protein sensors infer cleavage when protease action uncouples orthogonal N- and C-terminal tags, enabling fluorescence or antibody-based readouts.
• High-contrast reporter systems make cleavage visible by exploiting the large optical effect of nanoparticle removal rather than directly measuring a small biological molecule.
• CRISPR-Cas trans-cleavage systems can amplify a target-recognition event by cleaving reporter nucleic acids, converting molecular recognition into a measurable signal.
• Proteasomal cleavage can be inferred indirectly from the termini of MHC-presented peptides detected by high-throughput ligandomics, although the signal is inherently noisy.
• Disulfide-cleavage chemosensors represent another indirect strategy, using cleavage-triggered chemical or optical changes to report biological activity.

Featured sourceHigh contrast cleavage detectionopg.optica.org7 sourcesView sources