Fluorine Fragment Cocktails in Fragment-Based Drug Discovery

Fragment-based drug discovery (FBDD) has emerged as a powerful strategy in the quest for novel therapeutic agents. Within this approach, fluorine fragment cocktails – mixtures of diverse fluorine fragments screened simultaneously – play a significant role due to their potential to accelerate drug discovery. The cornerstone of the strategy is a bunch of unique physicochemical properties of fluorine. Its sensitivity to nuclear magnetic resonance (NMR) makes it an excellent choice for fragment screening. The use of ¹⁹F NMR spectroscopy [1, 2] provides a powerful tool for studying molecular interactions: researchers can exploit the sensitivity and specificity of fluorine in NMR to gain insights into binding events at an atomic level and obtain valuable structural information, enabling identification of potential drug leads [1-3].

 Figure 1. Cocktail #2: Example of the fluorine-containing fragments from the Life Chemicals Fluorine Fragment Cocktail Library.

The advantages of using fragment cocktails for FBDD projects are manifold [4- 6]. First and foremost, the simultaneous screening of multiple fragments allows for the accelerated identification of potential hits, expediting the early stages of drug discovery. At the same time, fragment cocktails notably raise screening efficiency, reducing the time and resources required for screening. The synergy between fragments within a cocktail increases the likelihood of capturing binding events, even for weakly interacting molecules, improving the chances of identifying valuable hits and influencing the overall binding affinity and specificity. The adjustability of fragment cocktails makes possible the design of mixtures that target specific binding pockets or regions to obtain a more comprehensive target coverage. Fragment cocktails facilitate iterative design: modifying fragment cocktails based on initial screening results creates an adaptive and responsive approach to lead discovery. Fragment cocktails can be tailored to include fragments with diverse chemical properties, thus enhancing the coverage of chemical space (Fig. 2). Last but not least, fragment cocktails can be integrated into various screening techniques to improve the versatility of FBDD approaches.

Fig. 2. Predicted “fragment space” coverage of Life Chemicals fluorinated fragments (in red) is similar to the coverage of >100k commercially available fluorine-containing fragment-like molecules from eMolecules (in blue).

As a paragon example, in FBDD projects performed with ¹⁹F NMR-assisted screening [7, 8], fluorine fragment cocktails offer additional layers of versatility. The simultaneous screening of fragments with varying fluorine environments does give a more detailed and wide-ranging understanding of the binding landscape. Moreover, due to its flexibility, fluorine chemistry can target different binding pockets, strengthening the chances of discovering high-affinity lead compounds. The characteristic fluorine NMR signals (Fig. 3) contribute to optimized data analysis, aiding in interpreting complex spectra and extracting essential information from screening experiments.

Fig. 3. Exemplary ¹⁹F NMR spectra of different mixtures of fluorine-containing fragments,
adopted from [9]

While the advantages of fluorine fragment cocktails in FBDD are apparent, some demanding problems still need to be solved. The selection of optimal cocktail compositions requires careful consideration of fragment properties, such as size, solubility, and chemical diversity. Achieving the right balance between these factors is crucial to obtaining meaningful and interpretable results. Additionally, interpreting complex ¹⁹F NMR spectra needs special expertise, and a potential overlap of signals from different fragments in a cocktail adds complexity to data analysis. However, despite many challenges, the advantages of the approach make it a compelling avenue for researchers seeking efficient and innovative methods for lead discovery.

Fragment collections from Life Chemicals, such as the Fluorine Fragment Cocktail Library and the Fluorine Fragment Library, offer valuable resources and advantages for applying fluorine fragment cocktails to FBDD projects.

In addition to our focus on fluorine fragment cocktails in FBDD, we are pleased to offer a range of complementary services tailored to accommodate the diverse requirements of Early Drug Discovery:

• Quality Assurance Services include chiral chromatography and resolution of racemates, high-resolution mass spectrometry, and physicochemical compound profiling.
• Computational Chemistry: in silico screening and molecular modeling services for specific targets
• Custom Synthesis of individual compounds, their analogs or metabolites, compound library design, and hit optimization

Please, contact us at orders@lifechemicals.com for any additional information and price quotations.

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The compound selection can be customized based on your requirements, cherry picking is available.

References

1. Wang, L., Gao, J., Ma, R., Liu, Y., Liu, M., Zhong, F., et al. (2022). Recent progress in fragment-based drug discovery facilitated by NMR spectroscopy. Magnetic Resonance Letters, 2(2), 107-118. DOI: 10.1016/j.mrl.2021.100025

2. Norton R. S., Leung E.W.W., Chandrashekaran I. R., MacRaild C. A. (2016). Applications of ¹⁹F-NMR in Fragment-Based Drug Discovery. Molecules. 21(7):860. DOI: 10.3390/molecules21070860

3. Troelsen, N. S., Shanina, E., Gonzalez‐Romero, D., Danková, D., Jensen, I. S., Śniady, K. J., et al. (2020). The 3F library: Fluorinated Fsp3‐rich fragments for expeditious ¹⁹F NMR-based screening. Angewandte Chemie, 132(6), 2224-2230. DOI: 10.1002/ange.201913125

4. Troelsen, N. S., & Clausen, M. H. (2020). Library Design Strategies To Accelerate Fragment‐Based Drug Discovery. Chemistry–A European Journal, 26(50), 11391-11403. DOI: 10.1002/chem.202000584

5. Bon, M., Bilsland, A., Bower, J., & McAulay, K. (2022). Fragment‐based drug discovery—the importance of high‐quality molecule libraries. Molecular Oncology, 16(21), 3761-3777. DOI: doi.org/10.1002/1878-0261.13277

6. Sugiki T., Furuita K., Fujiwara T., Kojima C. (2018). Current NMR Techniques for Structure-Based Drug Discovery. Molecules. 23(1):148. DOI: 10.3390/molecules23010148

7. Buchholz, C. R., & Pomerantz, W. C. (2021). ¹⁹F NMR is viewed through two different lenses: ligand-observed and protein-observed ¹⁹F NMR applications for fragment-based drug discovery. RSC chemical biology, 2(5), 1312-1330. DOI: 10.1039/D1CB00085C

8. Johnson, J. A., Olson, N. M., Tooker, M. J., Bur, S. K., & Pomerantz, W. C. (2020). Combined Protein-and Ligand-Observed NMR Workflow to Screen Fragment Cocktails against Multiple Proteins: A Case Study Using Bromodomains. Molecules, 25(17), 3949. DOI: 10.3390/molecules25173949

9. Berg, H., Wirtz Martin, M. A., Niesteruk, A., Richter, C., Sreeramulu, S., Schwalbe, H. (2021). NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode. J. Vis. Exp., 172, e62262, DOI: 10.3791/62262