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Science 5 April 1985:
Vol. 228. no. 4695, pp. 80 - 83
DOI: 10.1126/science.3838385
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Articles

Science, Vol 228, Issue 4695, 80-83
Copyright © 1985 by American Association for the Advancement of Science

articles

Human dioxin-inducible cytochrome P1-450: complementary DNA and amino acid sequence

AK Jaiswal, FJ Gonzalez, and DW Nebert

Induction of cytochrome P1-450 has been linked to susceptibility to certain chemically induced cancers in mouse and man. Treatment of the human cell line MCF-7 with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) results in high levels of aryl hydrocarbon (benzo[a]pyrene) hydroxylase (P1-450) activity. This cell line was used to isolate a human P1-450 full-length complementary DNA (cDNA) clone. The cDNA is 2566 nucleotides in length, encodes a polyadenylated messenger RNA (2.8 kilobases in length), and has a continuous reading frame producing a protein with 512 residues (molecular weight, 58,151). The human P1-450 cDNA and protein are 63 percent and 80 percent similar to mouse P1-450 cDNA and protein, respectively. Whereas the mouse TCDD-inducible P-450 gene subfamily has two members (P1-450 and P3-450), the human TCDD-inducible gene subfamily appears to have only one gene (P1-450).


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