title: Induction of hexanol dehydrogenase in Geotrichum spp. by the addition of hexanol.
abstract: Excessive hexanol content distorts the flavor of foods and is harmful to human health. Previously, two strains of fungi were found capable of producing hexanol-degrading enzymes. The current study identified these strains as Galactomyces geotrichum according to the gene sequence of the 26 S rDNA D1/D2 region (strain S12) and genus Geotrichum according to the gene sequence of ITS region (strain S13). Parallel analysis of extracellular and intracellular enzyme activities showed that the enzymes mainly accumulated intracellularly. Native polyacrylamide gel electrophoresis with reactive dyes showed the enzymes were alcohol dehydrogenases induced by the addition of hexanol. Hexanol was catalyzed into hexanoic acid and hexanal by strain S12 and into hexanoic acid by strain S13. The optimum conditions for the induction of enzymes were determined to be 6-9 h in the presence of 0.7 g/l hexanol. The identification of two strains capable of enzymatically degrading hexanol and optimum conditions for their induction will facilitate their use in industrial applications.
authors: College of Food Science and Engineering, Northwest A & F University, 28 Xinong Road, Yangling, Shaanxi Province, 712100, China.
authors: Jinhua
authors: J
authors: Zhang
authors: Junling
authors: J
authors: Shi
authors: Hongliang
authors: H
authors: Lv
authors: Yanlin
authors: Y
authors: Liu
mesh_terms: D000426:Alcohol Dehydrogenase / Q000378:metabolism*; D000447:Aldehydes / Q000378:metabolism; D002208:Caproates / Q000378:metabolism; D016000:Cluster Analysis; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000737:chemistry / Q000235:genetics; D004591:Electrophoresis, Polyacrylamide Gel; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects*; D015966:Gene Expression Regulation, Fungal / Q000187:drug effects*; D020459:Genes, rRNA; D000441:Hexanols / Q000378:metabolism*; D008969:Molecular Sequence Data; D010802:Phylogeny; D012331:RNA, Fungal / Q000235:genetics; D012335:RNA, Ribosomal / Q000235:genetics; D004718:Saccharomycetales / Q000145:classification / Q000201:enzymology* / Q000302:isolation & purification / Q000378:metabolism*; D017422:Sequence Analysis, DNA
chemical_list: D000447:Aldehydes; D002208:Caproates; D004271:DNA, Fungal; D004275:DNA, Ribosomal; D021903:DNA, Ribosomal Spacer; D000441:Hexanols; D012331:RNA, Fungal; D012335:RNA, Ribosomal; C065096:RNA, ribosomal, 26S; C037652:hexanoic acid; C010463:n-hexanal; D000426:Alcohol Dehydrogenase