CYP2K6 from zebrafish (Danio rerio): Cloning, mapping, developmental/tissue expression, and aflatoxin B1 activation by baculovirus expressed enzyme
| Autor: | Woon-Gye Chung, Tzong-Hsiung Hseu, Chin-Hwa Hu, Jun-Lan Wang-Buhler, Hua-Pin Tseng, Cristobal L. Miranda, Donald R. Buhler, Yea-Huey Yang, Jan F. Stevens, M. Westerfield, Su-Jun Lee |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Fish Proteins
Aflatoxin B1 Embryo Nonmammalian Physiology Health Toxicology and Mutagenesis Molecular Sequence Data Spodoptera Biology Toxicology Polymerase Chain Reaction Biochemistry Mass Spectrometry law.invention chemistry.chemical_compound law Complementary DNA Animals Tissue Distribution Amino Acid Sequence Cloning Molecular Cytochrome P450 Family 2 Peptide sequence Zebrafish Biotransformation Chromatography High Pressure Liquid Gene Library Cloning Base Sequence Cell Biology General Medicine biology.organism_classification Molecular biology Recombinant Proteins Open reading frame chemistry Steroid Hydroxylases Recombinant DNA Aryl Hydrocarbon Hydroxylases Heterologous expression Cytochrome P-450 CYP4A Baculoviridae Sequence Alignment DNA Chromatography Liquid |
| Zdroj: | Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology. 140:207-219 |
| ISSN: | 1532-0456 |
| DOI: | 10.1016/j.cca.2005.02.002 |
| Popis: | A full-length zebrafish (Danio rerio) cytochrome P450 (CYP) 2K6 cDNA, was obtained (GenBank accession No. AF283813) through polymerase chain reaction cloning using degenerated primers based on a consensus CYP2 sequence and the heme-binding domain. This first CYP2K family member cloned from zebrafish had 1861 bp which contained 27 bp of 5'-untranslated region (5'-UTR), an open reading frame (ORF) of 1518 bp, and a 300 bp 3'-UTR with a poly A tail. The deduced 506 amino acid sequence of CYP2K6 had 63%, 62% and 59% identity with rainbow trout CYP2K1, CYP2K4 and CYP2K3, respectively; and 45%, 42%, and 42% identity with rabbit CYP2C1, human CYP2C19 and mouse CYP2C39, respectively. CYP2K6 mapped to 107.49cR on LG3 using the LN54 radiation hybrid panel. Its mRNA was detected at 5 days post-fertilization and in the adult liver and ovary among nine tissues examined. The ORF, including the 27 bp of the 5'-UTR, was cloned into pFastBac donor vector and then transferred into the baculovirus genome (bacmid DNA) in DH10Bac competent cells. The recombinant bacmid DNA was used to infect Spodoptera frugiperda insect cells to express the CYP2K6 protein (Bv-2K6). As its ortholog, rainbow trout Bv-2K1 [Yang, Y.H., Miranda, C.L., Henderson, M.C., Wang-Buhler, J.-L., Buhler, D.R., 2000. Heterologous expression of CYP2K1 and identification of the expressed protein (Bv-2K1) as lauric acid (omega-1)-hydroxylase and aflatoxin B1 exo-epoxidase. Drug Metab. Disp. 28,1279-83.], Bv-2K6 also catalyzed the conversion of aflatoxin B1 (AFB1) to its exo-8,9-epoxide as assessed by the trapping of a glutathione (GSH) adduct in the presence of a specific mouse alpha class glutathione S-transferase. The identity of the AFB1-GSH adduct was verified by liquid chromatography-mass spectrometry (LC-MS) and mass spectrometry-mass spectrometry (MS-MS) analysis. Although rainbow trout Bv-2K1 was capable of oxidizing lauric acid, zebrafish Bv-2K6 protein showed no activity against this substrate. |
| Databáze: | OpenAIRE |
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