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J. Biol. Chem., Vol. 265, Issue 14, 7900-7906, 05, 1990
JK Ritter, YY Sheen and IS Owens
The human cDNA clone, UDPGTh-2, encoding a liver UDP-
glucuronosyltransferase (transferase) was isolated from a lambda gt11 cDNA
library by hybridization to the mouse transferase cDNA clone, UDPGTm-1
(Kimura, T., and Owens, I. S. (1987) Eur. J. Biochem.168, 515- 521). The
two clones have nucleotide sequence identities in the coding region of 74%.
UDPGTh-2 encodes a 529-amino acid protein with an NH2 terminus
membrane-insertion signal peptide and a carboxyl terminus membrane-spanning
region. There are three potential asparagine-linked glycosylation sites at
residues 67, 68, and 315. In order to establish substrate specificity, the
clone was inserted into the pSVL vector (pUDPGTh-2) and expressed in COS-1
cells. The presence of a transferase with Mr congruent to 52,000 in
transfected cells cultured in the presence of [35S]methionine was shown by
immunocomplexed products with goat antimouse transferase IgG (Mackenzie, P.
I., Hjelmeland, L. H., and Owens, I. S. (1984) Arch. Biochem. Biophys. 231,
487-497) and protein A-Sepharose and analysis by sodium dodecyl sulfate-
polyacrylamide gel electrophoresis and autoradiography. The transferase is
a glycoprotein as indicated by a shift in Mr congruent to 3000-4000 when
expressed in the presence of tunicamycin. Sixty potential substrates were
tested using cells transfected with pUDPGTh-2. The order of relative
substrate activity was as follows: 4-hydroxyestrone greater than estriol
greater than 2-hydroxyestriol greater than 4- hydroxyestradiol greater than
6 alpha-hydroxyestriol greater than 5 alpha-androstane-3 alpha,11 beta,17
beta-triol = 5 beta-androstane-3 alpha,11 beta,17 beta-triol. There were
only trace amounts of glucuronidation of 2-hydroxyestrone and
2-hydroxyestradiol, and, in contrast to other cloned transferases, no
glucuronidation of either the primary estrogens/androgens (estrone, 17
beta-estradiol/testosterone, androsterone) or any of the exogenous
substrates tested. A Lineweaver- Burk plot of the effect of
4-hydroxyestrone concentration on the velocity of glucuronidation shows an
apparent Km of 13 microM. The unique specificity of this transferase for
3,4-catechol estrogens and estriol suggests it may play an important role
in regulating the level and activity of these potent and active estrogen
metabolites.
Cloning and expression of human liver UDP-glucuronosyltransferase in COS-1 cells. 3,4-catechol estrogens and estriol as primary substrates
Section on Drug Biotransformation, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892.
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