Sulphation is an important conjugation pathway in drug metabolism that has been studied in several species including humans. However, few studies have been performed using the dog as a subject. In this report we describe the cloning and characterization of a canine cytosolic sulphotransferase (SULT). The overall primary structure of this enzyme is very similar to that of a rat phenol-sulphating enzyme found in the EMBL Database and to a mouse SULT termed amine-N-sulphotransferase (81% identity). The expressed canine SULT conjugates small phenols and aromatic amines such as dopamine, minoxidil, p-nitrophenol and 5-hydroxytryptamine, but not dehydroepiandrosterone or β-oestradiol. These results are in agreement with the results reported for the mouse SULT. In contrast with the mouse enzyme, the canine SULT does not conjugate eicosanoid compounds, i.e. prostaglandins, thromboxane B2 or leukotriene E4. The canine SULT is expressed at high levels in the colon of both genders; it is also expressed in the small intestine, kidney and liver. Furthermore, because the canine, mouse and rat SULT forms exhibit significant sequence identity (more than 80%), they seem to represent a distinct group in the SULT family tree. This suggestion is strengthened by the low identity with other SULTs. The subfamily that is most similar to this new group is SULT1A, with approx. 60% similarity. However, the mouse and canine enzymes are not characterized by the efficient sulphation of p-nitrophenol, dopamine, β-oestradiol or oestrone. Thus these results seem to exclude them from the SULT1A subfamily. We therefore propose a new subfamily in the phenol SULT family, designated SULT1D, and consequently the canine enzyme is termed SULT1D1.
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June 2001
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Research Article|
June 08 2001
Identification of a new subfamily of sulphotransferases: cloning and characterization of canine SULT1D1
Carrie TSOI;
Carrie TSOI
∗Institute of Environmental Medicine, Karolinska Institutet, Box 210, 171 77 Stockholm, Sweden
†DMPK Discovery, AstraZeneca R&D, 151 85 Södertälje, Sweden
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Charles N. FALANY;
Charles N. FALANY
‡Department of Pharmacology and Toxicology, 101Volker Hall, University of Alabama at Birmingham, Birmingham, AL 35294, U.S.A.
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Ralf MORGENSTERN;
Ralf MORGENSTERN
∗Institute of Environmental Medicine, Karolinska Institutet, Box 210, 171 77 Stockholm, Sweden
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Stellan SWEDMARK
Stellan SWEDMARK
1
†DMPK Discovery, AstraZeneca R&D, 151 85 Södertälje, Sweden
1To whom correspondence should be addressed (e-mail stellan.swedmark@astrazeneca.com).
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Publisher: Portland Press Ltd
Received:
November 06 2000
Revision Received:
March 09 2001
Accepted:
April 11 2001
Online ISSN: 1470-8728
Print ISSN: 0264-6021
The Biochemical Society, London ©2001
2001
Biochem J (2001) 356 (3): 891–897.
Article history
Received:
November 06 2000
Revision Received:
March 09 2001
Accepted:
April 11 2001
Citation
Carrie TSOI, Charles N. FALANY, Ralf MORGENSTERN, Stellan SWEDMARK; Identification of a new subfamily of sulphotransferases: cloning and characterization of canine SULT1D1. Biochem J 15 June 2001; 356 (3): 891–897. doi: https://doi.org/10.1042/bj3560891
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