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Distinct epitopes on amiloride.

T R Kleyman¹, J P Kraehenbuhl, B C Rossier

¹Department of Medicine, University of Pennsylvania, Philadelphia 19104.

The American Journal of Physiology

|December 11, 1989

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Researchers identified distinct binding regions on the drug amiloride, crucial for its interaction with sodium transport proteins. Antibodies revealed that both the pyrazinyl and guanidinocarbonyl groups are essential for amiloride

Area of Science:

Pharmacology
Biochemistry
Immunology

Background:

The drug amiloride inhibits most Na(+)-selective transport proteins.
Previous studies with amiloride analogues suggested specific drug regions bind to these protein receptors.

Purpose of the Study:

To investigate if distinct amiloride domains are recognized as separate epitopes.
To map the specific regions of amiloride that interact with transport proteins.

Main Methods:

Amiloride was chemically linked to albumin via its C-5 NH2-group or guanidino moiety.
Antibodies were generated against these amiloride-albumin conjugates.
Antibody binding to various amiloride analogues was analyzed.

Main Results:

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Antibody studies identified the 3,5-diaminopyrazinyl, guanidinocarbonyl, and C-6 halo moieties as distinct epitopes.
Antibody binding was dependent on the presence of both the 3,5-diaminopyrazinyl and guanidinocarbonyl moieties.

Conclusions:

Amiloride's interaction with Na(+) transport proteins involves specific, recognizable epitopes.
The 3,5-diaminopyrazinyl and guanidinocarbonyl groups are critical for amiloride binding and inhibition.