3-Ketosteroid- 1-Dehydrogenase of Rhodococcus rhodochrous: Sequencing of the Genomic DNA and Hyperexpression, Purification, and Characterization of the Recombinant Enzyme
| Autor: | Shingo Morii, Eiji Itagaki, Masahiko Miyamoto, Yuhji Yamauchi, Shizue Sawamoto, Masafumi Iwami |
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| Rok vydání: | 1998 |
| Předmět: |
DNA
Bacterial Molecular Sequence Data Hyperexpression Biochemistry Catalysis Chromatography DEAE-Cellulose Plasmid Complementary DNA Sequence Escherichia coli Rhodococcus Amino Acid Sequence Cloning Molecular Molecular Biology Gene Peptide sequence Chromatography High Pressure Liquid 3-ketosteroid-Δ1-dehydrogenase Expression vector Base Sequence Sequence Homology Amino Acid biology Testosterone acetate Spectrum Analysis General Medicine Rhodococcus rhodochrous Monooxygenase biology.organism_classification Molecular biology Recombinant Proteins Recombinant enzyme Electrophoresis Polyacrylamide Gel Oxidoreductases Steroid desaturation |
| Zdroj: | Journal of Biochemistry. 124:1026-1032 |
| ISSN: | 0021-924X |
| DOI: | 10.1093/oxfordjournals.jbchem.a022195 |
| Popis: | 金沢大学自然科学研究科 金沢大学理工研究域自然システム学系 The gene encoding 3-ketosteroid-Δ1-dehydrogenase from Rhodococcus rhodochrous was cloned and sequenced. The gene (ksdD) consists of 1,536 nucleotides and encodes an enzyme protein of 511 amino acid residues. The amino terminal methionine residue was deleted in the mature protein. The amino acids involved in the flavin binding site are conserved in the dehydrogenase sequence. The deduced amino acid sequence is highly homologous to that from Arthrobacter simplex but less so to that from Pseudomonas testosteroni. Upstream of the gene was located a heat shock protein gene, dnaJ, and downstream, a gene of a hypothetical protein. The enzyme gene was ligated with an expression vector to construct a plasmid pDEX-3 and introduced into Escherichia coli cells. The transformed cells hyperexpressed the 3-ketosteroid-Δ1-dehydrogenase as an active and soluble protein at more than 30 times the level of R. rhodochrous cells. Purification of the recombinant 3-ketosteroid-Δ1-dehydrogenase from the E. coli cells by a simplified procedure yielded about 13 mg of enzyme protein/liter of the bacterial culture. The purified recombinant dehydrogenase exhibited identical molecular and catalytic properties to the R. rhodochrous enzyme. |
| Databáze: | OpenAIRE |
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