Any feedback?
Please rate this page
(literature.php)
(0/150)

BRENDA support

Literature summary for 2.4.1.133 extracted from

  • Saliba, M.; Ramalanjaona, N.; Gulberti, S.; Bertin-Jung, I.; Thomas, A.; Dahbi, S.; Lopin-Bon, C.; Jacquinet, J.C.; Breton, C.; Ouzzine, M.; Fournel-Gigleux, S.
    Probing the acceptor active site organization of the human recombinant beta1,4-galactosyltransferase 7 and design of xyloside-based inhibitors (2015), J. Biol. Chem., 290, 7658-7670.
    View publication on PubMedView publication on EuropePMC

Application

Application Comment Organism
drug development the enzyme is a target for the development of enzyme inhibitors as regulators of glycosaminoglycan synthesis in therapeutics Homo sapiens

Cloned(Commentary)

Cloned (Comment) Organism
expressed in Escherichia coli BL21(DE3) cells Homo sapiens
gene B4GALT7, recombinant expression of GST-tagged wild-type and mutant enzymes in CHOpgsB-618 cells, recombinant expression of the soluble GST-tagged mutant enzyme in Escherichia coli strain BL21(DE3) Homo sapiens

Protein Variants

Protein Variants Comment Organism
D211N inactive Homo sapiens
H195A site-directed mutagenesis, the mutant shows reduced activity compared to the wild-type enzyme Homo sapiens
H195A the mutant shows reduced activity compared to the wild type enzyme Homo sapiens
H195Q site-directed mutagenesis, the mutant shows reduced activity compared to the wild-type enzyme Homo sapiens
H195Q the mutant shows reduced activity compared to the wild type enzyme Homo sapiens
H195R site-directed mutagenesis, the mutant shows reduced activity compared to the wild-type enzyme Homo sapiens
H195R the mutant shows reduced activity compared to the wild type enzyme Homo sapiens
additional information construction of a soluble enzyme mutant by truncation of the first 60 N-terminal amino acids Homo sapiens
R226A site-directed mutagenesis, the mutant shows reduced activity compared to the wild-type enzyme Homo sapiens
R226A the mutant shows reduced activity compared to the wild type enzyme Homo sapiens
R226K site-directed mutagenesis, the mutant shows reduced activity compared to the wild-type enzyme Homo sapiens
R226K the mutant shows reduced activity compared to the wild type enzyme Homo sapiens
R270A site-directed mutagenesis, the mutant shows reduced activity compared to the wild-type enzyme Homo sapiens
R270A the mutant shows reduced activity compared to the wild type enzyme Homo sapiens
R270K site-directed mutagenesis, the mutant shows reduced activity compared to the wild-type enzyme Homo sapiens
R270K the mutant shows reduced activity compared to the wild type enzyme Homo sapiens
Y194A inactive Homo sapiens
Y194A site-directed mutagenesis, inactive mutant Homo sapiens
Y194F inactive Homo sapiens
Y194F site-directed mutagenesis, inactive mutant Homo sapiens
Y196A inactive Homo sapiens
Y196A site-directed mutagenesis, inactive mutant Homo sapiens
Y196F site-directed mutagenesis, the mutant shows reduced activity compared to the wild-type enzyme Homo sapiens
Y196F the mutant shows reduced activity compared to the wild type enzyme Homo sapiens
Y199A inactive Homo sapiens
Y199A site-directed mutagenesis, inactive mutant Homo sapiens
Y199F site-directed mutagenesis, the mutant shows reduced activity compared to the wild-type enzyme Homo sapiens
Y199F the mutant shows reduced activity compared to the wild type enzyme Homo sapiens

Inhibitors

Inhibitors Comment Organism Structure
4-methylumbelliferyl 4-deoxy-beta-D-fluoroxylose
-
Homo sapiens
4-methylumbelliferyl 4-deoxy-beta-D-xylopyranoside
-
Homo sapiens
4-methylumbelliferyl 4-deoxy-beta-D-xyloside
-
Homo sapiens
4-methylumbelliferyl 4-fluoro-beta-D-xylopyranoside 50% inhibition at 2 mM. The strategic position of Tyr194 forming stacking interactions with the aglycone, and the hydrogen bond between the His195 nitrogen backbone and the carbonyl group of the coumarinyl molecule to develop a tight binder of the enzyme. This leads to the synthesis of 4-deoxy-4-fluoroxylose linked to 4-methylumbelliferone that inhibits enzyme activity in vitro with a Ki 10 times lower than the Km value and efficiently impairs glycosaminoglycan synthesis in a cell assay Homo sapiens
additional information not inhibited by naphthyl 4-deoxy-beta-D-xylopyranoside; structure-guided design of enzyme inhibitors, xyloside inhibitors design and in vitro and in cellulo competition assays, overview Homo sapiens
naphthyl 4-deoxy-beta-D-xylopyranoside slight inhibition Homo sapiens

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
additional information
-
additional information Michaelis-Menten kinetics Homo sapiens
0.22
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant wild-type enzyme Homo sapiens
0.22
-
UDP-alpha-D-galactose wild type enzyme, at pH 7.0 and 37°C Homo sapiens
0.27
-
UDP-alpha-D-galactose mutant enzyme R270A, at pH 7.0 and 37°C Homo sapiens
0.27
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R270A Homo sapiens
0.29
-
UDP-alpha-D-galactose mutant enzyme R226K, at pH 7.0 and 37°C Homo sapiens
0.29
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R226K Homo sapiens
0.32
-
UDP-alpha-D-galactose mutant enzyme H195R, at pH 7.0 and 37°C Homo sapiens
0.32
-
UDP-alpha-D-galactose mutant enzyme Y199F, at pH 7.0 and 37°C Homo sapiens
0.32
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant H195R Homo sapiens
0.32
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant Y199F Homo sapiens
0.33
-
UDP-alpha-D-galactose mutant enzyme H195Q, at pH 7.0 and 37°C Homo sapiens
0.33
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant H195Q Homo sapiens
0.34
-
UDP-alpha-D-galactose mutant enzyme R226A, at pH 7.0 and 37°C Homo sapiens
0.34
-
UDP-alpha-D-galactose mutant enzyme Y196F, at pH 7.0 and 37°C Homo sapiens
0.34
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R226A Homo sapiens
0.34
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant Y196F Homo sapiens
0.35
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant wild-type enzyme Homo sapiens
0.35
-
4-methylumbelliferyl alpha-D-xylopyranoside wild type enzyme, at pH 7.0 and 37°C Homo sapiens
0.35
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme H195R, at pH 7.0 and 37°C Homo sapiens
0.35
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant H195R Homo sapiens
0.37
-
UDP-alpha-D-galactose mutant enzyme R270K, at pH 7.0 and 37°C Homo sapiens
0.37
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R270K Homo sapiens
0.4
-
UDP-alpha-D-galactose mutant enzyme H195A, at pH 7.0 and 37°C Homo sapiens
0.4
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant H195A Homo sapiens
0.44
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme R226A, at pH 7.0 and 37°C Homo sapiens
0.44
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R226A Homo sapiens
0.46
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme R226K, at pH 7.0 and 37°C Homo sapiens
0.46
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R226K Homo sapiens
0.54
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme R270K, at pH 7.0 and 37°C Homo sapiens
0.54
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R270K Homo sapiens
0.55
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme H195Q, at pH 7.0 and 37°C Homo sapiens
0.55
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant H195Q Homo sapiens
0.59
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme Y199F, at pH 7.0 and 37°C Homo sapiens
0.59
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant Y199F Homo sapiens
0.6
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme R270A, at pH 7.0 and 37°C Homo sapiens
0.6
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R270A Homo sapiens
0.64
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme H195A, at pH 7.0 and 37°C Homo sapiens
0.64
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant H195A Homo sapiens
1.06
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme Y196F, at pH 7.0 and 37°C Homo sapiens
1.06
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant Y196F Homo sapiens

Metals/Ions

Metals/Ions Comment Organism Structure
Mn2+ required Homo sapiens

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
39000
-
x * 39000, SDS-PAGE Homo sapiens
39000
-
x * 39000, glycosylated recombinant enzyme, SDS-PAGE Homo sapiens

Organism

Organism UniProt Comment Textmining
Homo sapiens Q9UBV7
-
-
Homo sapiens Q9UBV7 gene B4GALT7
-

Purification (Commentary)

Purification (Comment) Organism
glutathione Sepharose column chromatography Homo sapiens
recombinant soluble GST-tagged mutant enzyme from Escherichia coli strain BL21(DE3) Homo sapiens

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
UDP-alpha-D-galactose + 4-methylumbelliferyl alpha-D-xylopyranoside
-
Homo sapiens UDP + 4-methylumbelliferyl 4-O-beta-D-galactopyranosyl-beta-D-xylopyranoside
-
?
UDP-alpha-D-galactose + 4-methylumbelliferyl-beta-D-xylopyranoside the strategic position of Tyr194 forming stacking interactions with the aglycone, and the hydrogen bond between the His195 nitrogen backbone and the carbonyl group of the coumarinyl molecule to develop a tight binder of the enzyme. This leads to the synthesis of 4-deoxy-4-fluoroxylose linked to 4-methylumbelliferone that inhibits enzyme activity in vitro with a Ki 10 times lower than the Km value and efficiently impairs glycosaminoglycan synthesis in a cell assay. Molecular modeling of the enzyme's active site in the presence of UDP-alpha-D-galactose and 4-methylumbelliferyl-beta-D-xylopyranoside using the crystal structure of Drosophila melanogaster enzyme dbeta4GalT7, PDB code 4M4K, overview Homo sapiens UDP + ?
-
?

Subunits

Subunits Comment Organism
? x * 39000, SDS-PAGE Homo sapiens
? x * 39000, glycosylated recombinant enzyme, SDS-PAGE Homo sapiens

Synonyms

Synonyms Comment Organism
beta1,4-galactosyltransferase 7
-
Homo sapiens
beta4GalT7
-
Homo sapiens
hbeta4GalT7
-
Homo sapiens
xylosylprotein beta1,4-galactosyltransferase
-
Homo sapiens

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
37
-
assay at Homo sapiens

Turnover Number [1/s]

Turnover Number Minimum [1/s] Turnover Number Maximum [1/s] Substrate Comment Organism Structure
0.5
-
UDP-alpha-D-galactose mutant enzyme Y196F, at pH 7.0 and 37°C Homo sapiens
0.5
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant Y196F Homo sapiens
0.5
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant Y196F Homo sapiens
0.77
-
UDP-alpha-D-galactose mutant enzyme R270A, at pH 7.0 and 37°C Homo sapiens
0.77
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R270A Homo sapiens
0.77
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R270A Homo sapiens
0.81
-
UDP-alpha-D-galactose mutant enzyme R270K, at pH 7.0 and 37°C Homo sapiens
0.81
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R270K Homo sapiens
0.81
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R270K Homo sapiens
0.89
-
UDP-alpha-D-galactose mutant enzyme R226A, at pH 7.0 and 37°C Homo sapiens
0.89
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R226A Homo sapiens
0.89
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R226A Homo sapiens
1.21
-
UDP-alpha-D-galactose mutant enzyme Y199F, at pH 7.0 and 37°C Homo sapiens
1.21
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant Y199F Homo sapiens
1.21
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant Y199F Homo sapiens
1.35
-
UDP-alpha-D-galactose mutant enzyme R226K, at pH 7.0 and 37°C Homo sapiens
1.35
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R226K Homo sapiens
1.35
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R226K Homo sapiens
1.49
-
UDP-alpha-D-galactose mutant enzyme H195R, at pH 7.0 and 37°C Homo sapiens
1.49
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant H195R Homo sapiens
1.49
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant H195R Homo sapiens
1.5
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant wild-type enzyme Homo sapiens
1.5
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant wild-type enzyme Homo sapiens
1.51
-
UDP-alpha-D-galactose wild type enzyme, at pH 7.0 and 37°C Homo sapiens
1.62
-
UDP-alpha-D-galactose mutant enzyme H195Q, at pH 7.0 and 37°C Homo sapiens
1.62
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant H195Q Homo sapiens
1.62
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant H195Q Homo sapiens
1.93
-
UDP-alpha-D-galactose mutant enzyme H195A, at pH 7.0 and 37°C Homo sapiens
1.93
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant H195A Homo sapiens
1.93
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant H195A Homo sapiens

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7
-
assay at Homo sapiens

Ki Value [mM]

Ki Value [mM] Ki Value maximum [mM] Inhibitor Comment Organism Structure
0.03
-
4-methylumbelliferyl 4-deoxy-beta-D-fluoroxylose at pH 7.0 and 37°C Homo sapiens
0.03
-
4-methylumbelliferyl 4-fluoro-beta-D-xylopyranoside pH 7.0, 37°C, recombinant wild-type enzyme Homo sapiens
0.53
-
4-methylumbelliferyl 4-deoxy-beta-D-xyloside at pH 7.0 and 37°C Homo sapiens
0.53
-
4-methylumbelliferyl 4-deoxy-beta-D-xylopyranoside pH 7.0, 37°C, recombinant wild-type enzyme Homo sapiens

IC50 Value

IC50 Value IC50 Value Maximum Comment Organism Inhibitor Structure
0.06
-
at pH 7.0 and 37°C Homo sapiens 4-methylumbelliferyl 4-deoxy-beta-D-fluoroxylose
0.06
-
pH 7.0, 37°C, recombinant wild-type enzyme Homo sapiens 4-methylumbelliferyl 4-fluoro-beta-D-xylopyranoside
1.28
-
at pH 7.0 and 37°C Homo sapiens 4-methylumbelliferyl 4-deoxy-beta-D-xyloside
1.28
-
pH 7.0, 37°C, recombinant wild-type enzyme Homo sapiens 4-methylumbelliferyl 4-deoxy-beta-D-xylopyranoside

General Information

General Information Comment Organism
additional information mapping of the organization of the acceptor binding pockex in complex with 4-methylumbelliferone-xylopyranoside as prototype substrate by combining molecular modeling, in vitro mutagenesis, and kinetic measurements, and in cellulo analysis of glycosaminoglycan anabolism and decorin glycosylation. The organization is governed, on one side, by three tyrosine residues, Tyr194, Tyr196, and Tyr199, which create a hydrophobic environment and provide stacking interactions with both xylopyranoside and aglycone rings. On the opposite side, a hydrogen-bond network is established between the charged amino acids Asp228, Asp229, and Arg226, and the hydroxyl groups of xylose Homo sapiens
physiological function human xylosylprotein beta1,4-galactosyltransferase catalyzes the transfer of the first Gal residue of the tetrasaccharide linkage from the activated sugar UDP-galactose onto Xyl residues attached to the proteoglycan core protein. Because all glycosaminoglycans share the same stem core tetrasaccharide, the enzyme is a central enzyme in glycosaminoglycan biosynthesis Homo sapiens

kcat/KM [mM/s]

kcat/KM Value [1/mMs-1] kcat/KM Value Maximum [1/mMs-1] Substrate Comment Organism Structure
0.47
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme Y196F, at pH 7.0 and 37°C Homo sapiens
0.47
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant Y196F Homo sapiens
1.2
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme R270A, at pH 7.0 and 37°C Homo sapiens
1.2
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R270A Homo sapiens
1.42
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme R270K, at pH 7.0 and 37°C Homo sapiens
1.42
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R270K Homo sapiens
1.47
-
UDP-alpha-D-galactose mutant enzyme Y196F, at pH 7.0 and 37°C Homo sapiens
1.47
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant Y196F Homo sapiens
1.87
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme R226A, at pH 7.0 and 37°C Homo sapiens
1.87
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R226A Homo sapiens
1.88
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme Y199F, at pH 7.0 and 37°C Homo sapiens
1.88
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant Y199F Homo sapiens
2.32
-
UDP-alpha-D-galactose mutant enzyme R270K, at pH 7.0 and 37°C Homo sapiens
2.32
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R270K Homo sapiens
2.85
-
UDP-alpha-D-galactose mutant enzyme R226A, at pH 7.0 and 37°C Homo sapiens
2.85
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R226A Homo sapiens
2.92
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme R226K, at pH 7.0 and 37°C Homo sapiens
2.92
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant R226K Homo sapiens
2.95
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme H195Q, at pH 7.0 and 37°C Homo sapiens
2.95
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant H195Q Homo sapiens
3
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme H195A, at pH 7.0 and 37°C Homo sapiens
3
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant H195A Homo sapiens
3.07
-
UDP-alpha-D-galactose mutant enzyme R270A, at pH 7.0 and 37°C Homo sapiens
3.07
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R270A Homo sapiens
4.03
-
4-methylumbelliferyl alpha-D-xylopyranoside mutant enzyme H195R, at pH 7.0 and 37°C Homo sapiens
4.03
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant mutant H195R Homo sapiens
4.05
-
UDP-alpha-D-galactose mutant enzyme Y199F, at pH 7.0 and 37°C Homo sapiens
4.05
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant Y199F Homo sapiens
4.17
-
4-methylumbelliferyl alpha-D-xylopyranoside wild type enzyme, at pH 7.0 and 37°C Homo sapiens
4.17
-
4-methylumbelliferyl-beta-D-xylopyranoside pH 7.0, 37°C, recombinant wild-type enzyme Homo sapiens
4.7
-
UDP-alpha-D-galactose mutant enzyme R226K, at pH 7.0 and 37°C Homo sapiens
4.7
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant R226K Homo sapiens
4.85
-
UDP-alpha-D-galactose mutant enzyme H195A, at pH 7.0 and 37°C Homo sapiens
4.85
-
UDP-alpha-D-galactose mutant enzyme H195R, at pH 7.0 and 37°C Homo sapiens
4.85
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant H195A Homo sapiens
4.92
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant H195Q Homo sapiens
4.92
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant mutant H195R Homo sapiens
7.08
-
UDP-alpha-D-galactose wild type enzyme, at pH 7.0 and 37°C Homo sapiens
7.08
-
UDP-alpha-D-galactose pH 7.0, 37°C, recombinant wild-type enzyme Homo sapiens