PREDICT HITS FOR THE WDR DOMAIN OF LRRK2
The first CACHE Challenge target is LRRK2, the most commonly mutated gene in familial Parkinson's Disease.
Participants are asked to find hits for the WD40 repeat (WDR) domain of LRRK2. Read more under Details below.
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Leucine-rich repeat serine/threonine-protein kinase 2 (LRRK2)
|Disease association||Parkinson’s Disease (PD)|
|Challenge||Finding ligands targeting the central cavity of the WD-40 repeat (WDR) domain (aa 2142-2498)|
|PDB ID (challenge)||6DLO (2.7 Å) WDR domain|
|PDB ID (full-length)||7LHT (3.5 Å)|
An antisense oligonucleotide that binds the mRNA of the LRRK2 gene and lowers the cellular level of LRRK2 is also in clinical trials.
|CRISPR cell and animal models reported||1. In Vitro CRISPR/Cas9-Directed Gene Editing to Model LRRK2 G2019S Parkinson’s Disease in Common Marmosets
2. Generation of two LRRK2 homozygous knockout human induced pluripotent stem cell lines using CRISPR/Cas9
|Why the WDR domain?||PD-associated LRRK2 mutations tend to promote LRRK2 filament formation and enhance LRRK2 interaction with microtubules. Recent structural data reveals that only compounds stabilizing the open form of LRRK2 antagonize the pathogenic formation of LRRK2 filaments in cells, but most kinase inhibitors stabilize the closed form of LRRK2. An alternative and so far overlooked strategy is to pharmacologically target the WDR domain of LRRK2, which is juxtaposed to the kinase domain. The WDR domain in LRRK2 may be important for recruiting LRRK2 signalling partners or for binding to tubulin. WDR domains are disease-associated and druggable. Identifying chemical starting points binding to the WDR domain of LRRK2 is a novel approach to target this protein.|
|Potential impact||The public release of chemical starting points for an understudied domain of LRRK2 will offer opportunities to target LRRK2 via an allosteric mechanism and make PROTACs to induce its degradation with ligands not directly interfering with the catalytic activity of the target.