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IUBMB Comments Involved in the biosynthesis of galactose-containing glycosaminoglycan of the ameboid protozoan Dictyostelium discoideum .
Synonyms
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galactosyltransferase, uridine diphosphogalactose-mucopolysaccharide
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UDP Gal/polysaccharide galactosyl transferase
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UDP galactose:polysaccharide galactosyl transferase
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UDP-galactose polysaccharide transferase
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UDP-galactosyl:asialo-mucin transferase
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UDPgalactose:glycosaminoglycan D-galactosyltransferase
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UDPgalactose:mucopolysaccharide galactosyltransferase
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UDPgalactose:polysaccharide transferase
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UDP-alpha-D-galactose + glycosaminoglycan = UDP + D-galactosylglycosaminoglycan
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hexosyl group transfer
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UDP-galactose:glycosaminoglycan D-galactosyltransferase
Involved in the biosynthesis of galactose-containing glycosaminoglycan of the ameboid protozoan Dictyostelium discoideum.
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UDP-galactose + glycosaminoglycan
UDP + D-galactosylglycosaminoglycan
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Substrates: -
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UDPgalactose + glycosaminoglycan
UDP + D-galactosylglycosaminoglycan
UDPgalactose + glycosaminoglycan
UDP + D-galactosylglycosaminoglycan
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Substrates: the enzyme is involved in biosynthesis of prespore-specific acid mucopolysaccharide
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UDPgalactose + glycosaminoglycan
UDP + D-galactosylglycosaminoglycan
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Substrates: acidic mucopolysaccharide
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UDPgalactose + glycosaminoglycan
UDP + D-galactosylglycosaminoglycan
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Substrates: involved in the biosynthesis of galactose-containing glycosaminoglycan of Dictostelium discoideum
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UDPgalactose + glycosaminoglycan
UDP + D-galactosylglycosaminoglycan
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Substrates: the enzyme transfers a betaGal residue to 3-linked alpha-GalNAc of galactosaminoglycan backbone to form a side chain
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UDPgalactose + glycosaminoglycan
UDP + D-galactosylglycosaminoglycan
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Substrates: desialylated bovine submaxillary mucin type I, ovomucoid, ovalbumin, preferred substrate: desialylated mucin
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UDPgalactose + glycosaminoglycan
UDP + D-galactosylglycosaminoglycan
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Substrates: involved in the biosynthesis of galactose-containing glycosaminoglycan of Dictostelium discoideum
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ATP
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stimulates at low UDPgalactose concentration, inhibits at high UDPgalactose concentration
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K+
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14 mM, 2.5fold stimulation
Mn2+
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maximal activation by 5 mM MnCl2
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CuCl2
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5-10 mM, more than 90% inhibition
EDTA
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inhibits probably due to complex binding to Mn2+
Lead acetate
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5-10 mM, more than 90% inhibition
p-chloromercuribenzoate
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5-10 mM, more than 90% inhibition
ATP
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reversible, possibly regulates activity in vivo
ATP
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inhibits at high UDPgalactose concentration, stimulates at low UDPgalactose concentration
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2-mercaptoethanol
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stimulation
ATP
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inhibits at high UDPgalactose concentration, stimulates at low UDPgalactose concentration
Polyethyleneglycol
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enhances activity
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7.5
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6.4 - 8
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pH 6.4: about 50% of maximal activity, pH 8.0: about 90% of maximal activity at pH 8.0
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0 - 21
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reaction proceeds faster at 0°C than at 21°C
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male albino Sprague-Dawley
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NC-4, haploid wild-type and its mutant Fr-17, slime mould, not mutants Fr-2 and AGG-204
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activity appears shortly before actual synthesis of galactose-containing mucopolysaccharides, it reaches a peak of activity shortly before the end of fruiting body construction and then disappears
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specifically localized in. Activity sharply changes in response to differentiation and dedifferentiation
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migrating, no activity in vegetative cells
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additional information
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enzyme is specifically localized in the smaller vesicles with lighter density than the prespore-specific vacuoles identifiable electron microscopically
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Highest Expressing Human Cell Lines
Filter by:
Cell Line Links
Gene Links
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200000
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non-denaturing PAGE
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rapid loss of activity is prevented by the presence of albumin or Triton-X
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Sussman, M.; Osborn, M.J.
UDP-galactose polysaccharide transferase in the cellular slime mold, Dictyostelium discoideum: appearance and disappearance of activity during cell differentiation
Proc. Natl. Acad. Sci. USA
52
81-87
1964
Dictyostelium discoideum
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Andersson, G.N.; Eriksson, L.C.
Characterization of UDP-galactosyl:asialo-mucin transferase activity in the Golgi system of rat liver
Biochim. Biophys. Acta
570
239-247
1979
Rattus norvegicus
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Ikeda, T.
Subcellular distributions of UDP-galactose:polysaccharide transferase and UDP-glucose pyrophosphorylase involved in biosynthesis of prespore-specific acid mucopolysaccharide in Dictyostelium discoideum
Biochim. Biophys. Acta
675
69-76
1981
Dictyostelium discoideum
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Sakurai, M.H.; Kiyohara, H.; Nakahara, Y.; Okamoto, K.; Yamada, H.
Galactose-containing polysaccharides from Dictyostelium mucoroides as possible acceptor molecules for cell-type specific galactosyltransferase
Comp. Biochem. Physiol. B
132B
541-549
2002
Dictyostelium mucoroides
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Nakahara, Y.; Okamoto, K.
Unusual properties of the prespore-specific enzyme, UDP galactose:polysaccharide galactosyl transferase, of Dictyostelium discoideum
J. Basic Microbiol.
44
459-470
2004
Dictyostelium discoideum
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