title: Cloning and expression of cDNA encoding a bovine adrenal cytochrome P-450 specific for steroid 21-hydroxylation.
abstract: We isolated a cDNA clone encoding a bovine adrenal cytochrome P-450 specific for steroid 21-hydroxylation (P-450C21). Serum from rabbits immunized with purified P-450C21 precipitated a single protein from the products of an in vitro translation reaction using bovine adrenal mRNA. This protein migrated with P-450C21 on NaDodSO4/polyacrylamide gel electrophoresis. After sucrose gradient sedimentation, mRNA encoding P-450C21 was found in the 19S fraction. This fraction was reverse transcribed into double-stranded cDNA and inserted into the Pst I site of pBR322 by the dC X dG tailing procedure. Escherichia coli cells transformed with recombinant plasmids were screened with an in situ immunoassay using anti-P-450C21 serum and 125I-labeled staphylococcal protein A. Two colonies consistently bound anti-P-450C21 serum. They were identified as carrying the same plasmid by restriction mapping. This plasmid, pC21a, contains an insert of 520 base pairs. It hybridizes with mRNA encoding P-450C21. The peptide encoded by the insert in pC21a is highly homologous to two peptides isolated from porcine P-450C21 and shows limited homology to the P-450 induced by phenobarbital in rat liver. This clone may be useful in studying the molecular genetics of human congenital adrenal hyperplasia due to 21-hydroxylase deficiency.
mesh_terms: D000311:Adrenal Glands / Q000201:enzymology*; D000595:Amino Acid Sequence; D000818:Animals; D000936:Antigen-Antibody Complex; D001483:Base Sequence; D002417:Cattle; D003001:Cloning, Molecular; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D004247:DNA / Q000378:metabolism*; D007106:Immune Sera; D010957:Plasmids; D012333:RNA, Messenger / Q000235:genetics; D013255:Steroid 21-Hydroxylase / Q000235:genetics*; D013250:Steroid Hydroxylases / Q000235:genetics*
chemical_list: D000936:Antigen-Antibody Complex; D007106:Immune Sera; D012333:RNA, Messenger; D004247:DNA; D003577:Cytochrome P-450 Enzyme System; D013250:Steroid Hydroxylases; D013255:Steroid 21-Hydroxylase