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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50464

Title: cDNA-directed expression of a functional zebrafish CYP1A in yeast
Authors: Chung WG
Sen A
Wang-Buhler JL
Yang YH
Lopez N
Merrill GF
Miranda CL
Hu CH
Buhler DR
Contributors: 國立臺灣海洋大學:生命科學暨生物科技學系
Date: 2004-11
Issue Date: 2018-10-09T01:53:59Z
Publisher: Aquat Toxicol
Abstract: Abstract: A cytochrome P450 1A (CYP1A) cDNA was isolated from an adult zebrafish (Danio rerio) library. The 2580-bp clone (GenBank Accession No. AF210727) contained a 62-bp 5'-unstranslated region (UTR), 1557-bp coding region and 962-bp 3'-UTR. The deduced 519-residue protein (calculated molecular weight 58,556, pI = 7.58) shared 74% identity with rainbow trout CYP1A and 57 and 54% identities with mouse and human CYP1A1s, respectively. The zebrafish CYP1A protein coding region was cloned into the pDONR201 entry vector and then transferred to a yeast expression vector pYES-DEST52. Expression of zebrafish CYP1A in Saccharomyces cerevisiae transformants was induced by galactose to a maximum level of 493 pmol CYP1A per mg microsomal protein or about 8 nmol/l of culture. Recombinant CYP1A protein expressed in yeast was mainly in the denatured P420 form under normal microsomal preparation conditions but when the oxygen concentration was reduced in the buffer by degassing and the yeast cells were maintained at less than 10 degrees C, the integrity of the CYP1A was preserved and it exhibited a characteristic reduced CO-difference spectrum maximum at 448 nm. The recombinant zebrafish CYP1A demonstrated 7-ethoxyresorufin O-deethylase (EROD) activity with an apparent Km (Km(app)) and Vmax values at 30 degrees C of 0.31 +/- 0.04 microM and 0.70 +/- 0.10 nmol/min/nmol CYP, respectively. The recombinant protein also metabolized benzo(a)pyrene with a Km(app) and Vmax values of 5.34 +/- 0.58 microM and 1.16 +/- 0.13 nmol/min/nmol CYP, respectively. These results show the recombinant expression of a functional zebrafish CYP in yeast and validated yeast as a host for heterologous expression of zebrafish CYP1A and potentially for other zebrafish CYPs.
Relation: 70(2) pp.111-121
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50464
Appears in Collections:[Department of Bioscience and Biotechnology ] Periodical Articles

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