Abstract A014: OICR41103: a chemical probe for investigating DCAF1 function and therapeutic potential
Bibliographic record
Abstract
Abstract DCAF1 is a multifunctional protein that plays an important role in cellular processes, including protein degradation, cell cycle regulation, and immune function, by serving as a substrate receptor for RING-type CRL4 and the HECT family EDVP E3 ubiquitin ligases. Due to its involvement in various biological pathways and diseases, such as cancer and viral infections, there is a growing need for tools to study and regulate DCAF1 functions. Building upon our previous discovery of OICR-38268, a small-molecule binder of the DCAF1 WD40 domain, we have developed an improved chemical probe, OICR-41103. This compound exhibits enhanced binding affinity and selectivity for the WD40 domain of DCAF1. We successfully crystallized OICR-41103 with the WD40 domain, revealing its binding mode. Our probe binds to the WD40 domain of DCAF1 with a low nanomolar affinity in biophysical assays, and engages this domain in cells at nanomolar concentrations. This work presents a valuable chemical probe for studying DCAF1 function and provides a foundation for future drug discovery efforts, either by directly targeting DCAF1 or leveraging it for PROTAC-based strategies Citation Format: Mahmoud Noureldin, Serah Kimani, Brian Wilson, Levon Halabelian, Rima Al-awar. OICR41103: a chemical probe for investigating DCAF1 function and therapeutic potential. [abstract]. In: Proceedings of the AACR Special Conference in Cancer Research: Optimizing Therapeutic Efficacy and Tolerability through Cancer Chemistry; 2024 Dec 9-11; Toronto, Ontario, Canada. Philadelphia (PA): AACR; Mol Cancer Ther 2024;23(12_Suppl):Abstract nr A014
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.013 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".