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.
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Selected References
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