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Literature summary for 2.4.1.46 extracted from

  • Heemskerk, J.W.M.; Jacobs, F.H.H.; Scheijen, M.A.M.; Helsper, J.P.F.G.; Wintermans, J.F.G.M.
    Characterization of galactosyltransferases in spinach chloroplast envelopes (1987), Biochim. Biophys. Acta, 918, 189-203.
No PubMed abstract available

Inhibitors

Inhibitors Comment Organism Structure
4-hydroxymercuribenzoic acid 0.01 mM, 65% inhibition Spinacia oleracea
Cd2+
-
Spinacia oleracea
N-ethylmaleimide 0.005-0.1 mM, complete inhibition of solubilized enzyme; 0.5 mM, 57% inhibition Spinacia oleracea
oleic acid 0.3 mM, 58% inhibition Spinacia oleracea
UDP 0.15 mM, 79% inhibition Spinacia oleracea
Zn2+ 10 mM, complete inhibition, stimulation at 1 mM Spinacia oleracea

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.04
-
UDPgalactose
-
Spinacia oleracea

Localization

Localization Comment Organism GeneOntology No. Textmining
chloroplast envelope
-
Spinacia oleracea 9941
-

Metals/Ions

Metals/Ions Comment Organism Structure
Mg2+ stimulates Spinacia oleracea
Mg2+ cation not required Spinacia oleracea
Mn2+ stimulates, cation not required Spinacia oleracea
Zn2+ 1 mM, stimulation, inhibition at 10 mM Spinacia oleracea

Organism

Organism UniProt Comment Textmining
Spinacia oleracea
-
-
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
UDP-galactose + 1,2-diacylglycerol
-
Spinacia oleracea UDP + 3-beta-D-galactosyl-1,2-diacylglycerol
-
?
UDP-galactose + 1,2-dioleoylglycerol
-
Spinacia oleracea UDP + 3-beta-D-galactosyl-1,2-dioleoylglycerol
-
?
UDP-galactose + 1,2-distearoylglycerol
-
Spinacia oleracea UDP + 3-beta-D-galactosyl-1,2-distearoylglycerol
-
?

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
30
-
assay at, activity maximum in long-term incubation Spinacia oleracea
50
-
activity maximum in short-term incubation Spinacia oleracea

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7
-
approx. value Spinacia oleracea

pH Range

pH Minimum pH Maximum Comment Organism
5.5 9 55% of maximal activity at pH 5.5, 85% of maximal activity at pH 9.0 Spinacia oleracea