Sensitivity improvement in 19F NMR-based screening experiments: theoretical considerations and experimental...

Area of Science:

• Biochemistry
• Chemical Biology
• Drug Discovery

Background:

• NMR-based screening methods like FAXS and 3-FABS offer alternatives for identifying drug candidates.
• Current limitations include low sensitivity, restricting the number of compounds tested.
• Low sensitivity hinders the detection of weak or slow-binding molecules crucial for fragment-based drug discovery.

Purpose of the Study:

• To overcome the sensitivity limitations of FAXS and 3-FABS screening.
• To evaluate the performance of a novel cryogenic (19)F probe in NMR-based screening.
• To demonstrate the application of this technology for rapid screening at low enzyme concentrations.

Main Methods:

• Utilized a novel cryogenically cooled (19)F probe to reduce thermal noise.
• Performed theoretical simulations and experimental quantitative performance evaluations.
• Applied 3-FABS combined with the cryogenic probe for screening at low enzyme concentrations.

Main Results:

• The cryogenic (19)F probe significantly improved sensitivity in FAXS and 3-FABS.
• Enhanced sensitivity led to increased throughput and detection of weaker/slower binders.
• Reduced protein and substrate consumption was observed, enabling screening at very low enzyme concentrations.

Conclusions:

• Cryogenic (19)F probe technology is a viable solution to enhance NMR-based screening sensitivity.
• This advancement expands the utility of FAXS and 3-FABS, particularly for fragment-based lead discovery.
• The improved method allows for more efficient and sensitive identification of potential drug candidates.