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- * UDP-glucoronosyl and UDP-glucosyl transferases signature *
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-
- In mammals UDP-glucoronosyl transferases (EC 2.4.1.17) (UDPGT) [1,2] are a
- large family of membrane-bound microsomal enzymes which catalyze the transfer
- of glucoronic acid to a wide variety of exogenous and endogenous lipophilic
- substrates. These enzymes are of major importance in the detoxification and
- subsequent elimination of xenobiotics such as drugs and carcinogens.
-
- Flavonol O(3)-glucosyltransferase (EC 2.4.1.91) is a plant enzyme [3] that
- catalyzes the transfer of glucose from UDP-glucose to a flavanol. This
- reaction is essential and one of the last steps in anthocyanin pigment
- biosynthesis.
-
- Baculoviruses express an ecdysteroid UDP-glucosyltransferase (EC 2.4.1.-) [4]
- (egt). This enzyme catalyzes the transfer of glucose from UDP-glucose to
- ectysteroids which are insect molting hormones. The expression of egt in the
- insect host interferes with the normal insect development by blocking the
- molting process.
-
- These three groups of enzymes share a conserved domain of about 50 amino acid
- residues located in their C-terminal section and from which a pattern has been
- extracted to detect them.
-
- -Consensus pattern: W-x(2)-Q-x(2)-[LIVM]-L-x-H-x(4)-A-F-[LIVM]-[STAG]-x-
- [STAG]-G-x(2)-[STAG]-x(3)-[STAG]-[LIVM]-x(3)-[LIVM]-P-
- [LIVM]-x(3)-P-[LIVMF](2)-x-[DE]-Q
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / Pattern and text revised.
-
- [ 1] Dutton G.J.
- (In) Glucoronidation of drugs and other compounds, Dutton G.J., Ed.,
- pp 1-78, CRC Press, Boca Raton, (1980).
- [ 2] Burchell B., Nebert D.W., Nelson D.R., Bock K.W., Iyanagi T.,
- Jansen P.L., Lancet D., Mulder G.J., Chowdhury J.R., Siest G.,
- Tephly T.R., Mackenzie P.I.
- DNA Cell Biol. 10:487-494(1991).
- [ 3] Furtek D., Schiefelbein J.W., Johnston F., Nelson O.E. Jr.
- Plant Mol. Biol. 11:473-481(1988).
- [ 4] O'Reilly D.R., Miller L.K.
- Science 245:1110-1112(1989).
-