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Literature summary for 5.1.3.2 extracted from

  • Zhang, Q.; Hrmova, M.; Shirley, N.J.; Lahnstein, J.; Fincher, G.B.
    Gene expression patterns and catalytic properties of UDP-D-glucose 4-epimerases from barley (Hordeum vulgare L.) (2005), Biochem. J., 394, 115-124.
    View publication on PubMedView publication on EuropePMC

Activating Compound

Activating Compound Comment Organism Structure
NAD+ non-covalently bound, released from the enzyme after denaturation with aqueous ethanol. Each enzyme molecule contains one molecule of NAD+ Hordeum vulgare

Cloned(Commentary)

Cloned (Comment) Organism
expression in Escherichia coli Hordeum vulgare

Inhibitors

Inhibitors Comment Organism Structure
UDP
-
Hordeum vulgare
UMP
-
Hordeum vulgare

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.04
-
UDP-Gal
-
Hordeum vulgare
0.04
-
UDP-galactose pH 8.0, 25°C Hordeum vulgare
0.055
-
UDP-Glc
-
Hordeum vulgare
0.055
-
UDP-glucose pH 8.0, 25°C Hordeum vulgare
0.16
-
UDP-GalNAc
-
Hordeum vulgare
0.16
-
UDP-GalNAc pH 8.0, 25°C Hordeum vulgare
0.2
-
UDP-GlcNAc
-
Hordeum vulgare
0.2
-
UDP-GlcNAc pH 8.0, 25°C Hordeum vulgare

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
39000
-
each subunit Hordeum vulgare
39000
-
x * 39000, recombinant enzyme, SDS-PAGE Hordeum vulgare

Organism

Organism UniProt Comment Textmining
Hordeum vulgare
-
L.
-
Hordeum vulgare Q58IJ6
-
-
Hordeum vulgare L.
-
L.
-

Source Tissue

Source Tissue Comment Organism Textmining
coleoptile levels of HvUGE1 mRNA are low in day 1 and day 3 coleoptiles, increases approximately 28fold in day 5 coleoptiles Hordeum vulgare
-
leaf expression of HvUGE1 is highest in leaf tips, rapidly decreases to very low levels in the basal region of the leaves Hordeum vulgare
-
root mRNA levels of HvUGE1 are very high in the maturation zone compared with other regions of the root Hordeum vulgare
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
UDP-Gal
-
Hordeum vulgare UDP-Glc
-
r
UDP-Gal
-
Hordeum vulgare L. UDP-Glc
-
r
UDP-galactose
-
Hordeum vulgare UDP-glucose
-
r
UDP-GalNAc
-
Hordeum vulgare UDP-GlcNAc
-
?
UDP-GalNAc
-
Hordeum vulgare UDP-GlcNAc
-
r
UDP-GalNAc
-
Hordeum vulgare L. UDP-GlcNAc
-
?
UDP-Glc
-
Hordeum vulgare UDP-Gal
-
r
UDP-Glc
-
Hordeum vulgare L. UDP-Gal
-
r

Subunits

Subunits Comment Organism
? x * 39000, recombinant enzyme, SDS-PAGE Hordeum vulgare
dimer homodimer, 2 * 39000 Hordeum vulgare

Synonyms

Synonyms Comment Organism
HvUGE1
-
Hordeum vulgare
HvUGE2
-
Hordeum vulgare
HvUGE3
-
Hordeum vulgare
UDP-Gal 4-epimerase
-
Hordeum vulgare
UDP-Glc 4-epimerase
-
Hordeum vulgare
UGE
-
Hordeum vulgare

Turnover Number [1/s]

Turnover Number Minimum [1/s] Turnover Number Maximum [1/s] Substrate Comment Organism Structure
0.07
-
UDP-GlcNAc 25°C, pH 8.0 Hordeum vulgare
0.12
-
UDP-GalNAc 25°C, pH 8.0 Hordeum vulgare
11
-
UDP-glucose 25°C, pH 8.0 Hordeum vulgare
21
-
UDP-galactose 25°C, pH 8.0 Hordeum vulgare

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
8 9.5
-
Hordeum vulgare
8 9.5 interconversion of UDP-glucose and UDP-galactose Hordeum vulgare

Cofactor

Cofactor Comment Organism Structure
NAD+ non-covalently bound, required in bacteria Hordeum vulgare

Ki Value [mM]

Ki Value [mM] Ki Value maximum [mM] Inhibitor Comment Organism Structure
0.032
-
UMP
-
Hordeum vulgare
0.032
-
UMP 25°C, pH 8.0 Hordeum vulgare
0.036
-
UDP
-
Hordeum vulgare
0.036
-
UDP 25°C, pH 8.0 Hordeum vulgare