Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/7627
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: A cytochrome P4501B gene from a fish, Pleuronectes platessa
Authors: Leaver, Michael
George, Stephen
Contact Email: m.j.leaver@stir.ac.uk
Keywords: carcinogens
CYP1A1
flatfish
pollution
polyaromatic hydrocarbon
Issue Date: 3-Oct-2000
Publisher: Elsevier
Citation: Leaver M & George S (2000) A cytochrome P4501B gene from a fish, Pleuronectes platessa, Gene, 256 (1-2), pp. 83-91.
Abstract: Tetrapod cytochrome P4501 family (CYP1A1, CYP1A2 and CYP1B1) enzymes are most active in hydroxylating a variety of environmental contaminants including polyaromatic hydrocarbons (PAH), planar polychlorinated biphenyls and arylamines and thus play a pivotal role in the toxicology of these compounds. Mammalian CYP1A1 and CYP1A2 genes appear to have diverged after the evolutionary emergence of mammals, whereas fish species apparently possess only one CYP1A family gene, and fish CYP1A enzymes exhibit properties of both of the mammalian isoforms. We have isolated a further CYP1 family gene from a marine flatfish (plaice; Pleuronectes platessa), which, on the basis of exon organisation and sequence similarity, can be assigned as a piscine CYP1B. Its deduced amino acid sequence shows the closest (54%) identity to mammalian CYP1B1 proteins and, on the basis of molecular modeling studies, shows a high degree of positional and structural conservation of the substrate contacting amino acid residues in its putative active site when compared to other CYP1 enzymes. Phylogenetic analysis of fish and mammalian CYP1 family sequences indicates that the plaice CYP1B and mammalian CYP1B1 genes share a common ancestry. Plaice CYP1B has a more restricted tissue expression profile than the previously isolated plaice CYP1A, only being detectable, by Northern blotting, in gill tissue. In contrast to CYP1A, which shows extensive PAH-dependent induction in a variety of tissues, plaice CYP1B appears unresponsive to treatment with a prototypical PAH-type inducer, β-naphthoflavone (BNF)
Type: Journal Article
URI: http://hdl.handle.net/1893/7627
URL: http://www.sciencedirect.com/science/article/pii/S0378111900003735
DOI Link: http://dx.doi.org/10.1016/S0378-1119(00)00373-5
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Aquaculture
Aquaculture

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