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DEtermination of Orphan Receptor PHysiological Agonists and sigNals

Project description

Orphan (receptors): a bioinformatics tool finds agonists and signalling pathways

Many drugs work by binding cell membrane receptors. Knowing their agonists and functions enables development of treatments targeting them. G-protein-coupled receptors (GPCRs) are the largest and most diverse group of membrane receptors in eukaryotes and a key drug target. They are highly structurally conserved yet bind a tremendous variety of signalling molecules. For example, humans have approximately 1 000 GPRCs, and each binds a highly specific molecule. Not surprisingly, many GPRCs are so-called orphan receptors – their agonists and functions are unknown. The ambitious European Research Council-funded DE-ORPHAN project will provide the first bioinformatics tool and screening technique that can determine the signalling pathways and agonists of orphan GPRCs.

Objective

G protein-coupled receptors make up both the largest membrane protein and drug target families. DE-ORPHAN aims to determine the close functional context; specifically physiological agonists and signaling pathways; and provide the first research tool compounds, of orphan peptide receptors.


Determination of physiological agonists (aka de-orphanization), by high-throughput screening has largely failed. We will introduce a new research strategy: 1) developing highly innovative bioinformatics methods for handpicking of all orphan receptor targets and candidate ligand screening libraries; and 2) employing a screening technique that can measure all signaling pathways simultaneously.

The first potent and selective pharmacological tool compounds will be identified by chemoinformatic design of focused screening libraries. We will establish the ligands’ structure-activity relationships important for biological activity and further optimization towards drugs.

The first potent and selective Gs- and G12/13 protein inhibitors will be designed by structure-based re-optimization from a recent crystal structure of a Gq-inhibitor complex, and applied to determine orphan receptor signaling pathways and ligand pathway-bias. They will open up for efficient dissection of important signaling networks and development of drugs with fewer side effects.

DE-ORPHANs design hypotheses are based on unique computational methods to analyze protein and ligand similarities and are founded on genomic and protein sequences, structural data and ligands. The interdisciplinary research strategy applies multiple ligands acting independently but in concert to provide complementary receptor characterization. The results will allow the research field to advance into studies of receptor functions and exploitation of druggable targets, ligands and mechanisms. Which physiological insights and therapeutic breakthroughs will we witness when these receptors find their place in human pharmacology and medicine?

Coordinator

KOBENHAVNS UNIVERSITET
Net EU contribution
€ 1 499 926,25
Address
Norregade 10
1165 Kobenhavn
Denmark

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Region
Danmark Hovedstaden Byen København
Activity type
Higher or Secondary Education Establishments
Links
Total cost
€ 1 499 926,25

Beneficiaries (1)