Isolation and characterization of an Arabidopsis thaliana C-8,7 sterol isomerase: functional and structural similarities to mammalian C-8,7 sterol isomerase/emopamil-binding protein

Isolation and characterization of an Arabidopsis thaliana C-8,7 sterol isomerase: functional and... The yeast C-8,7 sterol isomerase contains a polyvalent high-affinity drug binding site similar to mammalian sigma receptors. Exogenously supplied sigma ligands inhibit sterol biosynthesis in yeast, demonstrating a pharmacological relationship between sigma ligand-binding and C-8,7 sterol isomerase activity. We report the isolation of an Arabidopsis thaliana C-8,7 sterol isomerase by functional complementation of the corresponding sterol mutant in yeast and its characterization by exposure to sigma ligands. The yeast erg2 mutant, which lacks the C-8,7 sterol isomerase gene and activity, was transformed with an Arabidopsis cDNA yeast expression library. Transformed colonies were selected for restoration of C-8,7 sterol isomerase activity (i.e. wild-type ergosterol production) by enhanced resistance to the antibiotic cycloheximide. Sterols produced in complemented lines were characterized by gas chromatography-mass spectroscopy (GC-MS). The full-length A. thaliana cDNA (pA.t.SI1) that complemented the erg2 mutation contains an open reading frame encoding a 21 kDa protein that shares 68% similarity and 35% amino acid identity to the recently isolated mouse C-8,7 sterol isomerase. The sigma ligands, haloperidol, ifenprodil and verapamil inhibited the production of ergosterol in wild-type Saccharomyces cerevisiae and in the erg2 mutant complemented with pA.t.SI1. Structural and biochemical similarities between the A. thaliana C-8,7 sterol isomerase and the mammalian emopamil-binding protein (EBP) are discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

Isolation and characterization of an Arabidopsis thaliana C-8,7 sterol isomerase: functional and structural similarities to mammalian C-8,7 sterol isomerase/emopamil-binding protein

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Publisher
Kluwer Academic Publishers
Copyright
Copyright © 1998 by Kluwer Academic Publishers
Subject
Life Sciences; Biochemistry, general; Plant Sciences; Plant Pathology
ISSN
0167-4412
eISSN
1573-5028
D.O.I.
10.1023/A:1006028623875
Publisher site
See Article on Publisher Site

Abstract

The yeast C-8,7 sterol isomerase contains a polyvalent high-affinity drug binding site similar to mammalian sigma receptors. Exogenously supplied sigma ligands inhibit sterol biosynthesis in yeast, demonstrating a pharmacological relationship between sigma ligand-binding and C-8,7 sterol isomerase activity. We report the isolation of an Arabidopsis thaliana C-8,7 sterol isomerase by functional complementation of the corresponding sterol mutant in yeast and its characterization by exposure to sigma ligands. The yeast erg2 mutant, which lacks the C-8,7 sterol isomerase gene and activity, was transformed with an Arabidopsis cDNA yeast expression library. Transformed colonies were selected for restoration of C-8,7 sterol isomerase activity (i.e. wild-type ergosterol production) by enhanced resistance to the antibiotic cycloheximide. Sterols produced in complemented lines were characterized by gas chromatography-mass spectroscopy (GC-MS). The full-length A. thaliana cDNA (pA.t.SI1) that complemented the erg2 mutation contains an open reading frame encoding a 21 kDa protein that shares 68% similarity and 35% amino acid identity to the recently isolated mouse C-8,7 sterol isomerase. The sigma ligands, haloperidol, ifenprodil and verapamil inhibited the production of ergosterol in wild-type Saccharomyces cerevisiae and in the erg2 mutant complemented with pA.t.SI1. Structural and biochemical similarities between the A. thaliana C-8,7 sterol isomerase and the mammalian emopamil-binding protein (EBP) are discussed.

Journal

Plant Molecular BiologySpringer Journals

Published: Oct 6, 2004

References

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