MicroED as a Powerful Tool for Structure Determination of Macrocyclic Drug Compounds Directly from Their Powder...

Area of Science:

• Structural biology
• Drug discovery
• Chemical crystallography

Background:

• Macrocycles are valuable drug leads due to their ability to target challenging binding sites and reach intracellular targets.
• Limited structural data exists for macrocycles because of their inherent complexity and flexibility, hindering structural studies.
• Overcoming these limitations is crucial for advancing medicinal chemistry and natural product research.

Purpose of the Study:

• To determine novel atomic structures of macrocycles that have been difficult to study previously.
• To demonstrate the utility of Microcrystal Electron Diffraction (MicroED) for macrocycle structure determination.
• To showcase the rapid acquisition of structural data from small quantities of material.

Main Methods:

• Utilized cryo-electron microscopy (cryo-EM) specifically the MicroED technique.
• Applied MicroED to several macrocyclic compounds.
• Analyzed data to obtain atomic-resolution structural information.

Main Results:

• Successfully determined the novel atomic structures of multiple macrocycles.
• Demonstrated that MicroED can rapidly yield complex structures from nanogram quantities of material.
• Showcased the ability to capture different conformations of flexible macrocycles within a single experiment.

Conclusions:

• MicroED is a powerful and rapid method for atomic-resolution structural determination of complex macrocycles.
• This technique overcomes previous limitations in macrocycle structural studies.
• The findings will significantly impact contemporary drug discovery and natural product exploration.