Cloning and sequencing of a gene encoding cellobiose dehydrogenase from Trametes versicolor super(1)
Cellobiose dehydrogenase (CDH) is an enzyme produced under lignocellulose-degrading conditions by Trametes versicolor strain 52J (Tv) and several other wood-degrading fungi, including Phanerochaete chrysosporium (Pc). In order to understand better the nature and properties of this enzyme, we isolate...
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Veröffentlicht in: | Gene 1998-04, Vol.210 (2), p.211-219 |
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description | Cellobiose dehydrogenase (CDH) is an enzyme produced under lignocellulose-degrading conditions by Trametes versicolor strain 52J (Tv) and several other wood-degrading fungi, including Phanerochaete chrysosporium (Pc). In order to understand better the nature and properties of this enzyme, we isolated a genomic clone of Tv cdh using heterologous probes derived from the sequence of Pc cdh. DNA sequence analysis revealed that Tv cdh consists of 3091 bp of coding sequence interrupted by 14 introns. Southern blotting showed that the gene was present in a single copy in the strain of Tv analyzed. Tv cdh was shown by Northern blot analysis to be expressed as a single transcript under cellulolytic conditions. RT-PCR of poly(A) super(+) RNA isolated under cellulolytic conditions was used to generate a near full-length cDNA copy of the cdh mRNA. The deduced protein encoded by Tv cdh consists of 768 amino acids (aa), including a predicted 19 aa signal peptide. The protein had 73% identity to the corresponding protein from Pc, which is the only other CDH-encoding gene that has been cloned. Based upon its deduced primary structure and alignment to similar sequences, Tv CDH shares a general structural organization with Pc CDH and other hemoflavoenzymes. Amino acid residues H-109 and M-61 in the N-terminal heme domain are hypothesized to function in heme binding; the C-terminal flavin domain contained a consensus sequence for flavin binding between residues 217-222. Although the protein is known to bind to cellulose, no obvious homology to bacterial or fungal cellulose binding domains was observed. However, a strong homology was observed to a region of Pc CDH that is hypothesized to be involved in cellulose binding. |
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In order to understand better the nature and properties of this enzyme, we isolated a genomic clone of Tv cdh using heterologous probes derived from the sequence of Pc cdh. DNA sequence analysis revealed that Tv cdh consists of 3091 bp of coding sequence interrupted by 14 introns. Southern blotting showed that the gene was present in a single copy in the strain of Tv analyzed. Tv cdh was shown by Northern blot analysis to be expressed as a single transcript under cellulolytic conditions. RT-PCR of poly(A) super(+) RNA isolated under cellulolytic conditions was used to generate a near full-length cDNA copy of the cdh mRNA. The deduced protein encoded by Tv cdh consists of 768 amino acids (aa), including a predicted 19 aa signal peptide. The protein had 73% identity to the corresponding protein from Pc, which is the only other CDH-encoding gene that has been cloned. Based upon its deduced primary structure and alignment to similar sequences, Tv CDH shares a general structural organization with Pc CDH and other hemoflavoenzymes. Amino acid residues H-109 and M-61 in the N-terminal heme domain are hypothesized to function in heme binding; the C-terminal flavin domain contained a consensus sequence for flavin binding between residues 217-222. Although the protein is known to bind to cellulose, no obvious homology to bacterial or fungal cellulose binding domains was observed. 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In order to understand better the nature and properties of this enzyme, we isolated a genomic clone of Tv cdh using heterologous probes derived from the sequence of Pc cdh. DNA sequence analysis revealed that Tv cdh consists of 3091 bp of coding sequence interrupted by 14 introns. Southern blotting showed that the gene was present in a single copy in the strain of Tv analyzed. Tv cdh was shown by Northern blot analysis to be expressed as a single transcript under cellulolytic conditions. RT-PCR of poly(A) super(+) RNA isolated under cellulolytic conditions was used to generate a near full-length cDNA copy of the cdh mRNA. The deduced protein encoded by Tv cdh consists of 768 amino acids (aa), including a predicted 19 aa signal peptide. The protein had 73% identity to the corresponding protein from Pc, which is the only other CDH-encoding gene that has been cloned. Based upon its deduced primary structure and alignment to similar sequences, Tv CDH shares a general structural organization with Pc CDH and other hemoflavoenzymes. Amino acid residues H-109 and M-61 in the N-terminal heme domain are hypothesized to function in heme binding; the C-terminal flavin domain contained a consensus sequence for flavin binding between residues 217-222. Although the protein is known to bind to cellulose, no obvious homology to bacterial or fungal cellulose binding domains was observed. However, a strong homology was observed to a region of Pc CDH that is hypothesized to be involved in cellulose binding.</abstract></addata></record> |
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subjects | Trametes versicolor |
title | Cloning and sequencing of a gene encoding cellobiose dehydrogenase from Trametes versicolor super(1) |
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