PROTACs®/Molecular Glues/Ubiquitination Modifiers Mass spectrometry is a critical tool for evaluating PROTACs and molecular glues because it directly measures endogenous protein degradation and the ubiquitin-mediated mechanisms that drive targeted protein degradation (TPD). Proteomics can quantify changes in target protein abundance, confirm engagement of the ubiquitin–proteasome system through detection of ubiquitinated peptides, and distinguish true degradation from indirect effects. This direct readout is especially important for event-driven pharmacology, where transient compound binding leads to sustained protein loss. Beyond confirming target knockdown, mass spectrometry provides a system-wide view of degrader selectivity and mechanism. Proteome-wide analyses can reveal off-target degradation, neo-substrates induced by molecular glues, and pathway-level consequences that are not predictable from binding or reporter assays. Time-resolved MS experiments further help dissect the sequence of ubiquitination and protein clearance, supporting rational optimization of degrader potency and specificity. Luciferase-based assays remain valuable for early screening due to their speed and sensitivity, but they rely on engineered reporter systems that may not reflect endogenous regulation. Changes in reporter signal can arise from transcriptional effects, cytotoxicity, or reporter instability rather than true protein degradation. In contrast, mass spectrometry provides unambiguous, physiologically relevant evidence of target degradation and selectivity, making it the gold standard for mechanistic validation of PROTACs and molecular glues. TUBE based pulldown, evaluation and reporting allows LifeSensors to offer a top of the line service to evaluate the impact of PROTACs and Molecular Glues.
Compiled from http://www.lifesensors.com
