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Pulsed ultrafiltration mass spectrometry: a new method for screening combinatorial libraries

R B van Breemen1, C R Huang, D Nikolic

  • 1Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago 60612-7231, USA.

Analytical Chemistry
|June 1, 1997
PubMed
Summary

Pulsed ultrafiltration mass spectrometry rapidly screens combinatorial libraries for drug discovery. This method identifies solution-phase ligands binding to receptors, enabling efficient lead compound discovery.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Drug Discovery

Background:

  • Drug discovery requires rapid screening of large compound libraries.
  • Identifying specific ligand-receptor interactions in solution is challenging.

Purpose of the Study:

  • To develop a method for identifying solution-phase ligands that bind to receptors within combinatorial libraries.
  • To establish an on-line system combining ultrafiltration and electrospray mass spectrometry for this purpose.

Main Methods:

  • Developed pulsed ultrafiltration mass spectrometry (PUFS-MS).
  • Bound ligands to macromolecular receptors (e.g., human serum albumin).
  • Purified complexes via ultrafiltration, dissociated ligands with methanol, and detected via electrospray mass spectrometry.

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Main Results:

  • Successfully identified ligands with dissociation constants in the micromolar to nanomolar range.
  • Demonstrated reuse of receptors through repetitive bind-and-release experiments.
  • Validated the method with known ligand-receptor pairs, including drug candidates.

Conclusions:

  • Pulsed ultrafiltration mass spectrometry is a powerful new tool for screening combinatorial libraries.
  • This method supports efficient lead compound identification in drug discovery.
  • The system offers a simple and reusable approach for analyzing molecular interactions.