
Our mission is to develop a new class of highly-selective biologic drugs that effectively address the ongoing challenges of side-effects that are limiting the benefits of current treatments in difficult-to-drug diseases.
The approach leverages large libraries of engineered proteins, Selektides, based on a small and hyper-stable human protein scaffold with unique drug properties.
The drug discovery platform is based on a state-of-the-art combinatorial approach, powered by proprietary selection and computational strategies with AI-guided structure and function analysis, ultimately validated with high resolution Cryo-EM and in vivo studies.
SelekTx is focused on the discovery of highly selective therapeutic molecules targeting G Protein-coupled Receptors (GPCRs) with a platform proven to have broad applicability (Linse et al., PNAS USA 2022).
SelekTx will enter collaboration or licensing arrangements to advance our lead candidates from IND-enabling through clinical trials.
A single constrained peptide binding loop is presented on an inert hyperstable core scaffold structure, enabling the highly selective penetration of complex epitopes (the difficult-to-access regions in the extracellular domains of GPCRs where drugs must bind to work effectively). This highly selective recognition mitigates against off target binding and side effects.
The human-derived S100G scaffold exhibits low predicted immunogenicity, reducing safety risk and supporting repeat dosing – a key requirement for chronic disease treatment.
A tightly folded human scaffold that is thermostable up to boiling point, that does not bind to other proteins and is resistant to serum proteases, ensuring the optimal presentation of hypervariable binding peptides with enhanced bioavailability.
The 10 kDa scaffold is small, stable, and highly soluble, allowing Selektides to reach receptors that larger biologics struggle to access.
The Selektide scaffold provides additional engineering space for the creation of bispecific receptor targeting maximising receptor selectivity. The protein scaffold lacks cross-reactive binding, enabling creation of multimeric constructs and designed PK enhancement without compromising receptor engagement (see FormatSelekt).
Selektides express at high yield, are purified in simple workflows and scale efficiently using standard biologics infrastructure, avoiding the complex manufacturing and supply bottlenecks that constrain peptide-based GPCR therapeutics.

The platform involves coordination of four applied research strengths in an iterative fashion to produce fully validated drug candidates with detailed structural information on Selektide/GPCR complexes
SelekTx couples its discovery platform with deep collaboration across disease biology and clinical expertise, ensuring that target selection, molecular design and validation remain grounded in clinical relevance.
This integrated approach allows SelekTx to operate as an end-to-end preclinical drug development engine, translating platform innovation into development-ready therapeutic candidates.

Pipeline Overview
We have prioritised lead Selektides in each programme that are progressing through functional characterisation.
Each program is identifying Selektides with novel mechanisms of action in the target disease.
Crohn’s — Our Lead Programme — In Vivo Proof-of-Concept
With our translational partners, we have identified a first-in-class dual mechanism of action Selektide targeting immune cell localisation and persistence of inflammatory T-cells in the gut, thereby addressing disease drivers upstream of the cytokine blockade which dominate current therapeutic approaches.
Robust in vivo proof of concept has been demonstrated in a translationally relevant chronic ileitis model in collaboration with the University of Colorado School of Medicine, Mucosal Inflammation Program.
SelekTx represents the long-term research collaboration of Prof Sara Linse (Lund University) and Prof David O’Connell (UCD), and their ambition to commercialise this unique drug development platform.
UCD owns the IP and patent (filed in 2021) for the Selektide library and discovery platform, which will be licenced to SelekTx as spin-out company.
In 2022 the Founders published a detailed description of the library and the in vitro analysis of a lead inhibitor against secondary nucleation in the amyloid aggregation pathway of Alzheimer’s Disease – the first application of the Selektide Library. (Linse et al., PNAS USA 2022)
In 2024 pre-commercialisation grant funding awards were received from Enterprise Ireland and Novo Nordisk Fonden funding Selektide discovery research at UCD & Lund University.
SelekTx is currently undertaking the in vivo characterisation of its leading Selektide drug candidates.
SelekTx is seeking pharmaceutical partners to develop its initial lead drug candidates for clinical development.

Professor of Biochemistry and Structural Biology at Lund University, Sweden.

Lead for finance and commercialisation strategy of the spin-out company.

David O'Connell is Associate Professor of Biochemistry at UCD, Ireland.
The SelekTx research and development team is active across two laboratories located at UCD, Ireland and Lund University, Sweden.
A team of full-time 6 research scientists are dedicated to Selektide discovery and development with a primary focus on GPCRs.
The teams are actively engaged in method development to expand the capabilities of proprietary libraries, cell line panels and biochemical tools, computational analysis methods, high throughput binding kinetics, and Cryo-EM advancement of Selektide/Target complex visualisation.
These capabilities reflect a level of technical depth more typically associated with later-stage biotechnology companies.