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Selective A1-adenosine receptor antagonists identified using yeast Saccharomyces cerevisiae functional assays
R M Campbell1, C Cartwright, W Chen
1Cadus Pharmaceutical Corporation, Tarrytown, NY 10591, USA.
Bioorganic & Medicinal Chemistry Letters
|September 7, 1999
Summary
Researchers identified a selective adenosine A1 receptor antagonist, compound 4b, from a pyrrolo[2,3-d]pyrimidine library. This study highlights the importance of hydrogen bonding for antagonist potency.
Area of Science:
- Medicinal Chemistry
- Pharmacology
- Biochemistry
Background:
- Adenosine receptors (A1 and A2a) are crucial drug targets.
- Pyrrolo[2,3-d]pyrimidines represent a promising scaffold for drug discovery.
Purpose of the Study:
- To evaluate a biased library of pyrrolo[2,3-d]pyrimidines for adenosine receptor antagonism.
- To identify selective antagonists for human A1 and A2a adenosine receptors.
Main Methods:
- Utilized yeast-based functional assays to screen the compound library.
- Expressed human A1 and A2a adenosine receptors in yeast.
- Correlated functional activity with binding data.
Main Results:
- Identified compound 4b as a selective A1 adenosine receptor antagonist.
- Established a direct correlation between yeast functional activity and binding affinity.
- Determined that polar residues at C-4 require H-bond donor functionality for high potency.
Conclusions:
- Compound 4b is a potent and selective A1 adenosine receptor antagonist.
- Yeast-based functional assays are effective for evaluating adenosine receptor ligands.
- Structural features at C-4 are critical for antagonist potency in this chemical series.