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Literature summary for 2.4.1.123 extracted from

  • Pharr, D.M.; Sox, H.N.; Locy, R.D.; Huber, S.C.
    Partial characterization of the galactinol forming enzyme from leaves of Cucumis sativus L. (1981), Plant Sci. Lett., 23, 25-33.
No PubMed abstract available

General Stability

General Stability Organism
70-80% loss of activity during purification Cucumis sativus

Localization

Localization Comment Organism GeneOntology No. Textmining
additional information not in lysates of chloroplasts from leaves Cucumis sativus
-
-

Metals/Ions

Metals/Ions Comment Organism Structure
Mn2+ concentration influences pH-optimum Cucumis sativus

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
UDP-galactose + myo-inositol Cucumis sativus responsible for galactinol synthesis, involved in raffinose and stachyose biosynthesis, cf. EC 2.4.1.67 and EC 2.4.1.82 UDP + 1-O-alpha-D-galactosyl-D-myo-inositol
-
?

Organism

Organism UniProt Comment Textmining
Cucumis sativus
-
cucumber, cv. Chipper
-

Purification (Commentary)

Purification (Comment) Organism
partial, 41fold Cucumis sativus

Source Tissue

Source Tissue Comment Organism Textmining
leaf 7th node from the growing tip, from fruiting plants Cucumis sativus
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Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
additional information
-
-
Cucumis sativus

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
UDP-galactose + myo-inositol
-
Cucumis sativus UDP + 1-O-alpha-D-galactosyl-D-myo-inositol identical with galactinol ?
UDP-galactose + myo-inositol responsible for galactinol synthesis, involved in raffinose and stachyose biosynthesis, cf. EC 2.4.1.67 and EC 2.4.1.82 Cucumis sativus UDP + 1-O-alpha-D-galactosyl-D-myo-inositol
-
?

Synonyms

Synonyms Comment Organism
More cf. EC 2.4.1.67 and EC 2.4.1.82 Cucumis sativus

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
30
-
assay at Cucumis sativus

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
additional information
-
Mn2+-concentration influences pH-optimum Cucumis sativus
5.5
-
at 7 mM Mn2+ Cucumis sativus
5.6
-
assay at Cucumis sativus
6.2
-
at 2 mM Mn2+ Cucumis sativus
7
-
at 0.2 mM Mn2+, broad activity optimum centered around pH 7 Cucumis sativus

pH Range

pH Minimum pH Maximum Comment Organism
5 7 about half-maximal activity at pH 5 and 7, at 7 mM Mn2+ Cucumis sativus
5.1 7.8 about half-maximal activity at pH 5.1 and 7.8, at 2.0 mM Mn2+ Cucumis sativus
5.2 8.6 about half-maximal activity at pH 5.2 and 8.6, at 0.2 mM Mn2+ Cucumis sativus