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Literature summary for 2.2.1.1 extracted from

  • Wikner, C.; Nilsson, U.; Meshalkina, L.; Udekwu, C.; Lindqvist, Y.; Schneider, G.
    Identification of catalytically important residues in yeast transketolase (1997), Biochemistry, 36, 15643-15649.
    View publication on PubMed

Protein Variants

Protein Variants Comment Organism
H263A lower activity than wild-type enzyme Saccharomyces cerevisiae
H30A lower activity than wild-type enzyme Saccharomyces cerevisiae
H30N lower activity than wild-type enzyme Saccharomyces cerevisiae
H481A lower activity than wild-type enzyme Saccharomyces cerevisiae
H481Q lower activity than wild-type enzyme Saccharomyces cerevisiae
H481S lower activity than wild-type enzyme Saccharomyces cerevisiae
H69A lower activity than wild-type enzyme Saccharomyces cerevisiae

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.0003
-
thiamine diphosphate H481A Saccharomyces cerevisiae
0.0005
-
thiamine diphosphate H30N, H418S Saccharomyces cerevisiae
0.0006
-
thiamine diphosphate wild-type Saccharomyces cerevisiae
0.0007
-
thiamine diphosphate H481Q Saccharomyces cerevisiae
0.0008
-
thiamine diphosphate H30A Saccharomyces cerevisiae
0.0012
-
thiamine diphosphate H263A Saccharomyces cerevisiae
0.0018
-
thiamine diphosphate H69A Saccharomyces cerevisiae
0.023
-
D-xylulose 5-phosphate H263A Saccharomyces cerevisiae
0.07
-
D-xylulose 5-phosphate wild-type Saccharomyces cerevisiae
0.093
-
D-ribose 5-phosphate H263A Saccharomyces cerevisiae
0.146
-
D-ribose 5-phosphate wild-type Saccharomyces cerevisiae
0.15
-
D-ribose 5-phosphate H481A Saccharomyces cerevisiae
0.193
-
D-ribose 5-phosphate H69A Saccharomyces cerevisiae
0.29
-
D-ribose 5-phosphate H30A Saccharomyces cerevisiae
0.4
-
D-xylulose 5-phosphate H69A Saccharomyces cerevisiae
1.01
-
D-xylulose 5-phosphate H30A Saccharomyces cerevisiae
1.24
-
D-xylulose 5-phosphate H481A Saccharomyces cerevisiae
3.35
-
D-xylulose 5-phosphate H481S Saccharomyces cerevisiae
4.08
-
D-xylulose 5-phosphate H481Q Saccharomyces cerevisiae

Organism

Organism UniProt Comment Textmining
Saccharomyces cerevisiae
-
baker's yeast
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
D-xylulose 5-phosphate + D-ribose 5-phosphate
-
Saccharomyces cerevisiae sedoheptulose 7-phosphate + D-glyceraldehyde 3-phosphate
-
?

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
6.6 7.4 H481Q Saccharomyces cerevisiae
6.8 8 H30A Saccharomyces cerevisiae
7 7.8 H481A Saccharomyces cerevisiae
7.5 7.8 H69A Saccharomyces cerevisiae
7.6 8.2 wild-type Saccharomyces cerevisiae
7.6 8 H263A Saccharomyces cerevisiae