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Isocitrate lyase of Ashbya gossypii – transcriptional regulation and peroxisomal localization
Author(s) -
Maeting Ines,
Schmidt Georg,
Sahm Hermann,
Revuelta José Luis,
Stierhof York-Dieter,
Stahmann K.-Peter
Publication year - 1999
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(99)00017-4
Subject(s) - isocitrate lyase , peroxisome , chemistry , lyase , microbody , microbiology and biotechnology , biochemistry , biology , glyoxylate cycle , enzyme , gene
The isocitrate lyase‐encoding gene AgICL1 from the filamentous hemiascomycete Ashbya gossypii was isolated by heterologous complementation of a Saccharomyces cerevisiae icl1d mutant. The open reading frame of 1680 bp encoded a protein of 560 amino acids with a calculated molecular weight of 62 584. Disruption of the AgICL1 gene led to complete loss of AgIcl1p activity and inability to grow on oleic acid as sole carbon source. Compartmentation of AgIcl1p in peroxisomes was demonstrated both by Percoll density gradient centrifugation and by immunogold labeling of ultrathin sections using specific antibodies. This fitted with the peroxisomal targeting signal AKL predicted from the C‐terminal DNA sequence. Northern blot analysis with mycelium grown on different carbon sources as well as AgICL1 promoter replacement with the constitutive AgTEF promoter revealed a regulation at the transcriptional level. AgICL1 was subject to glucose repression, derepressed by glycerol, partially induced by the C 2 compounds ethanol and acetate, and fully induced by soybean oil.