Pharmacological Analysis of Sterol Δ8-Δ7 Isomerase Proteins with [3H]Ifenprodil
Abstract
Sterol Delta8-Delta7 isomerases (SIs) catalyze the shift of the double bond from C8-9 to C7-8 in the B-ring of sterols. Surprisingly, the isoenzymes in fungi (ERG2p) and vertebrates [emopamil binding protein (EBP)] are structurally completely unrelated, whereas the sigma1 receptor, a mammalian protein of unknown function, bears significant similarity with the yeast ERG2p. Here, we compare the drug binding properties of SIs and related proteins with [3H]ifenprodil as a common high affinity radioligand (Kd = 1.4-19 nM), demonstrating an intimate pharmacological relationship among ERG2p, sigma1 receptor, and EBP. This renders SIs a remarkable example for structurally diverse enzymes with similar pharmacological profiles and the propensity to bind drugs from different chemical groups with high affinity. We identified a variety of experimental drugs with nanomolar affinity for the human EBP (Ki = 0.5-14 nM) such as MDL28815, AY9944, triparanol, and U18666A. These compounds, as well as the fungicide tridemorph and the clinically used drugs tamoxifen, clomiphene, amiodarone, and opipramol, inhibit the in vitro activity of the recombinant human EBP (IC50 = 0.015-54 microM). The high affinity of the human EBP for 3H-tamoxifen (Kd = 3 +/- 2 nM) implies that the EBP carries the previously described microsomal antiestrogen binding site. Interactions of the EBP with structurally diverse lipophilic amines suggest that novel compounds of related structure should be counterscreened for inhib…
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U18666A and tamoxifen may bind the catalytic site of EBP to block enzymatic activity.
“This observation is consistent with a previous ligand-binding study in the yeast microsome12, suggesting that these compounds may bind the catalytic site of EBP to block enzymatic activity.”
From Structural basis for human sterol isomerase in cholesterol biosynthesis and multidrug recognition (2019) · cites this paper as [12]
U18666A and tamoxifen compete with [3H]-Ifenprodil binding to purified EBP in vitro.
“Our competition binding assay shows that either U18666A or tamoxifen can compete with the [3H]-Ifenprodil binding of purified EBP in vitro12 (Fig. 1d).”
From Structural basis for human sterol isomerase in cholesterol biosynthesis and multidrug recognition (2019) · cites this paper as [12]
Benztropine, clemastine, tamoxifen, U50488, and several HTS hits all inhibited EBP directly in a biochemical assay.
“we confirmed that benztropine, clemastine, tamoxifen, U50488, and several HTS hits all inhibited EBP directly in a biochemical assay”
From Accumulation of 8,9-unsaturated sterols drives oligodendrocyte formation and remyelination (2018) · cites this paper as [22]
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- Authors
- Moebius, F. F., Reiter, R. J., Bermoser, K., Glossmann, H., Cho, S. Y., & Paik, Y.-K.
- Affiliations
- Universität Innsbruck (AT)
- Venue
- Molecular Pharmacology
- Publisher
- Elsevier BV
- Published
- 1998-09
- Volume
- 54
- Issue
- 3
- Pages
- 591-598
- ISSN
- 0026-895X (ISSN-L)
- OpenAlex
- W2529858948
- Cited by
- 81
- References
- 42
- Citations by year
- 2026: 5 · 2025: 1 · 2024: 2 · 2023: 5 · 2022: 2 · 2021: 3 · 2020: 7 · 2019: 5 · 2018: 2 · 2017: 2 · 2016: 1 · 2015: 3 · 2014: 1 · 2013: 3 · 2012: 3
- FWCI
- 0.94
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Molecular Pharmacology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pharmacological Receptor Mechanisms and Effects
- Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Steroid Chemistry and Biochemistry
- Keywords
- emopamil binding protein, sigma-1 receptor, drug binding affinity, enzyme inhibition, antiestrogen binding sites, tridemorph, fungicides, triparanol, U18666A, AY-9944, clomiphene citrate, amiodarone, opipramol
- MeSH terms
- Adrenergic alpha-Antagonists, Animals, Brain, Carrier Proteins, Estrogen Antagonists, Guinea Pigs, Haloperidol, Isoenzymes, Kinetics, Microsomes, Microsomes, Liver, Piperidines, Saccharomyces cerevisiae, Steroid Isomerases, Tamoxifen, Tritium, Dopamine Antagonists, Excitatory Amino Acid Antagonists, Mice
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