Publication: Inhibition of sarcoplasmic reticulum Ca2+-ATPase by miconazole
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Date
2002-07
Authors
Lax Pérez, Antonio Manuel ; Fernández Belda, Francisco ; Soler Pardo, Fernando
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Publisher
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DOI
10.1152/ajpcell.00580.2001
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info:eu-repo/semantics/article
Description
©2002. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This document is the Accepted version of a Published Work that appeared in final form in American Journal of Physiology: Cell Physiology. To access the final edited and published work see https://doi.org/10.1152/ajpcell.00580.2001
Abstract
The inhibition of sarcoplasmic reticulum Ca2+-ATPase activity by miconazole was dependent on the concentration of ATP and membrane protein. Half-maximal inhibition was observed at 12 microM miconazole when the ATP concentration was 50 microM and the membrane protein was 0.05 mg/ml. When ATP was 1 mM, a low micromolar concentration of miconazole activated the enzyme, whereas higher concentrations inhibited it. A qualitatively similar response was observed when Ca2+ transport was measured. Likewise, the half-maximal inhibition value was higher when the membrane concentration was raised. Phosphorylation studies carried out after sample preequilibration in different experimental settings shed light on key partial reactions such as Ca2+ binding and ATP phosphorylation. The miconazole effect on Ca2+-ATPase activity can be attributed to stabilization of the Ca2+-free enzyme conformation giving rise to a decrease in the rate of the Ca2+ binding transition. The phosphoryl transfer reaction was not affected by miconazole.
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Citation
American Journal of Physiology: Cell Physiology. 2002 Jul 283(1):C85-92.doi: 10.1152/ajpcell.00580.2001.
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