Molecular cloning, cDNA structure and predicted amino acid sequence of bovine 3β‐hydroxy‐5‐ene steroid dehydrogenase/Δ5‐Δ4 isomerase

Publisher Website
Google Scholar
Abstract
We have used our recently characterized human 3β‐hydroxy‐5‐ene steroid dehydrogenase/Δ5‐Δ4‐isomerase (3β‐HSD) cDNA as probe to isolate cDNAs encoding bovine 3β‐HSD from a bovine ovary λgtll cDNA library. Nucleotide sequence analysis of two overlapping cDNA clones of 1362 bp and 1536 bp in length predicts a protein of 372 amino acids with a calculated molecular mass of 42093 (excluding the first Met). The deduced amino acid sequence of bovine 3β‐HSD displays 79% homology with human 3β‐HSD while the nucleotide sequence of the coding region shares 82% interspecies similarity. Hybridization of cloned cDNAs to bovine ovary poly(A)+ RNA shows the presence of an approximately 1.7 kb mRNA species.