Single amino acid exchanges in FAD-binding domains of squalene epoxidase of Saccharomyces cerevisiae lead to either loss of functionality or terbinafine sensitivity.

Abstract:

:Squalene epoxidase (Erg1p) is an essential enzyme in the ergosterol biosynthesis pathway in yeast. For its enzymatic activity, Erg1p requires molecular oxygen, NAD(P)H and FAD. Amino acid analysis and sequence alignment with other squalene epoxidases revealed two highly conserved FAD-binding domains, FAD I and FAD II. By random PCR mutagenesis of the ERG1 gene, one erg1 allele was isolated that carries a mutation leading to a single amino acid exchange in the FAD I domain close to the N-terminus of Erg1p. This erg1 allele codes for functional squalene epoxidase and renders yeast cells hypersensitive to terbinafine. Amino acid exchanges of other conserved residues in the FAD I and FAD II regions either led to non-functional squalene epoxidase or to the formation of squalene epoxidase with wild-type properties. These results describe the importance of specific amino acids for enzymatic activity in the yeast squalene epoxidase Erg1p.

journal_name

Biochem Soc Trans

authors

Ruckenstuhl C,Eidenberger A,Lang S,Turnowsky F

doi

10.1042/BST20051197

keywords:

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

1197-201

issue

Pt 5

eissn

0300-5127

issn

1470-8752

pii

BST20051197

journal_volume

33

pub_type

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