Two full-length cDNAs (F1-1 and F41-1) complementary to mouse kidney mRNA coding for cytochrome P-450 (P450) linked ferredoxin were isolated and completely sequenced. The coding sequences between F1-1 and F41-1 were identical. However, the 3' untranslated regions of F1-1 and F41-1 were 228 and 27 bases long due to the presence of alternative polyadenylation sites, respectively. The deduced amino acid sequence of mouse cytochrome P-450 linked ferredoxin showed 92.5, 75.0, 71.2 and 71.0% identities with those of rat, human, pig and bovine cytochrome P-450 linked ferredoxin, respectively. The cytochrome P-450 linked ferredoxin mRNA was detected in adrenal, kidney and ovary among the organs examined. The treatment of Y-1 cells with dibutyryladenosine 3',5'-cyclic monophosphate or forskolin induced the transcript of cytochrome P-450 linked ferredoxin mRNA.