title: Cloning, sequencing and expression of Pseudomonas testosteroni gene encoding 3 alpha-hydroxysteroid dehydrogenase.
abstract: We describe the cloning, sequencing and expression of the 3 alpha-hydroxysteroid dehydrogenase (3 alpha-HSD) gene of Pseudomonas testosteroni. A genomic library of P. testosteroni total DNA constructed from SauIIIA digests ligated to an lambda gt11 vector was probed with a polyclonal antibody raised against purified enzyme. Subclones derived from a recombinant phage containing a 1746 bp insert were sequenced and found to contain an open reading frame of 696 bp that corresponds to a protein of 231 amino acid residues. A search for homologous proteins was performed. No similarity was observed when comparing 3 alpha-HSD with known members of the short-chain dehydrogenase family. However a small proteic fragment (80 amino acids) shows homology with the N-terminal sequence of bacterial L7/L12 ribosomal proteins.
mesh_terms: D015096:3-Hydroxysteroid Dehydrogenases / Q000096:biosynthesis* / Q000235:genetics / Q000302:isolation & purification; D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli; D015870:Gene Expression; D005798:Genes, Bacterial; D015698:Genomic Library; D008969:Molecular Sequence Data; D010957:Plasmids; D011549:Pseudomonas / Q000201:enzymology* / Q000235:genetics*; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000302:isolation & purification; D015183:Restriction Mapping
chemical_list: D004269:DNA, Bacterial; D011994:Recombinant Proteins; D015096:3-Hydroxysteroid Dehydrogenases