Proximity Assays Topical Interest Group (TIG)

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Markus Queisser (GlaxoSmithKline) and Anastasia Velentza (Plexium), Chairs

Proximity-induced Pharmacology for New Modalities require specialized assays and knowledge for the development and optimization of the proximity-based molecules in addition to the traditional assay and screening cascades in drug discovery. 

Protein–protein interactions (PPIs) have pivotal roles in life processes. Aberrant PPIs are associated with various diseases, including cancer, infectious diseases, and neurodegenerative diseases. Therefore, targeting PPIs is a direction in treating diseases and an essential strategy for the development of new drugs. By contrast, PPI stabilization has remained largely underexplored but became recently the focus of induced proximity modalities such Targeted Protein Degradation (TPD) where small molecules mediate and stabilize PPIs, i.e Molecular glue degraders and natural products have demonstrated the therapeutic value of stabilizing native or non-native PPIs. Stabilization has the potential to target unstructured, difficult to drug proteins via composite PPI binding pockets. These modalities require specialized assays and a plethora of new assay formats have been recently developed to identify and characterise neomorphic PPIs.

The objective of our TIG is to facilitate and promote the exchange of knowledge and experience with proximity assays i.e in Targeted Protein Degradation and Protein-Protein Interactions, setting standards and educate the field. The TIG will meet several times annually and communicate progress through SLAS. Metric for success is the agreement to standards which are adopted by the field.

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  • Join us for an exciting panel discussion on Advances in Proximity Assays and Modalities on January 27 th at SLAS 2025! ...

Announcements

  • Attending SLAS Europe 2025? Don't miss the Proximity Assays TIG!

    While classical small molecule drugs modulate their target protein's activity, proximity-inducing compounds modulate their target protein's interactome. Ultimately, this can lead to changes in not only activity but also protein stability or localization. Molecular degraders facilitate the recruitment of an E3-ligase to a target protein thus catalytically triggering target polyubiquitylation and subsequent proteasomal degradation. This targeted protein degradation (TPD) mode of action results in specific challenges for the development of discovery strategies and requires a fit-for-purpose, comprehensive assay cascade to reliably and specifically identify target degraders from small molecule libraries.
    We are developing diverse cell-based TPD screening and validation assays and have identified workflows and assay cascades aimed to systematically discover chemistry acting via the TPD mechanism. Our setup is highly automated and includes 384-well plate-based, homogenous immunoassay as well as high-content imaging to directly quantify levels of target protein and its degradation. Moreover, a signal rescue-type assay is integrated where cell growth is recovered by target degradation, thereby excluding unspecific compounds. Additionally, aiming towards an integrated screening and knowledge platform, we are developing informatic tools and machine learning models for the TPD space.

    This presentation will focus on TPD screening workflows and analyse screening performance through examples of targets that are well-known and advanced in the TPD field.

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