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Literature summary for 2.6.1.9 extracted from

  • Gu, W.; Zhao, G.; Eddy, C.; Jensen, R.A.
    Imidazole acetol phosphate aminotransferase in Zymomonas mobilis: molecular genetic, biochemical, and evolutionary analyses (1995), J. Bacteriol., 177, 1576-1584.
    View publication on PubMedView publication on EuropePMC

Cloned(Commentary)

Cloned (Comment) Organism
-
Zymomonas mobilis

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.17
-
L-histidinol phosphate pH 7, 37°C Zymomonas mobilis
3.39
-
tyrosine pH 7, 37°C Zymomonas mobilis
43.48
-
phenylalanine pH 7, 37°C Zymomonas mobilis

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
40000
-
2 * 40000, homodimer, SDS-PAGE Zymomonas mobilis
85000
-
gel filtration Zymomonas mobilis

Organism

Organism UniProt Comment Textmining
Zymomonas mobilis
-
-
-

Purification (Commentary)

Purification (Comment) Organism
recombinant protein Zymomonas mobilis

Reaction

Reaction Comment Organism Reaction ID
L-histidinol phosphate + 2-oxoglutarate = 3-(imidazol-4-yl)-2-oxopropyl phosphate + L-glutamate mechanism Zymomonas mobilis

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
7
-
2-oxoglutarate + histidinol-phosphate Zymomonas mobilis
7.11
-
4-hydroxyphenylpyruvate + histidinol-phosphate Zymomonas mobilis
11.6
-
2-oxoglutarate + phenylalanine Zymomonas mobilis
11.6
-
2-oxoglutarate + tyrosine Zymomonas mobilis
18.24
-
-
Zymomonas mobilis

Storage Stability

Storage Stability Organism
-20°C over night and thawing on ice: 98% loss of activity Zymomonas mobilis
-80°C no loss of activity after several months when stored in 10% glycerol Zymomonas mobilis
-80°C over night and thawing on ice: 58% loss of activity Zymomonas mobilis

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
L-histidine + 2-oxoglutarate
-
Zymomonas mobilis 3-(imidazol-4-yl)-2-oxopropanoate + L-glutamate
-
?
L-histidinol phosphate + 2-oxoglutarate
-
Zymomonas mobilis 3-(imidazol-4-yl)-2-oxopropyl phosphate + L-Glu
-
?
L-histidinol phosphate + 4-hydroxyphenylpyruvate
-
Zymomonas mobilis 3-(imidazol-4-yl)-2-oxopropyl phosphate + L-tyrosine
-
?
L-histidinol phosphate + oxaloacetate
-
Zymomonas mobilis 3-(imidazol-4-yl)-2-oxopropyl phosphate + L-aspartate
-
?
L-histidinol phosphate + phenylpyruvate
-
Zymomonas mobilis 3-(imidazol-4-yl)-2-oxopropyl phosphate + L-phenylalanine
-
?
L-histidinol phosphate + pyruvate
-
Zymomonas mobilis 3-(imidazol-4-yl)-2-oxopropyl phosphate + L-Ala
-
?
L-leucine + 2-oxoglutarate
-
Zymomonas mobilis 4-methyl-2-oxopentanoate + L-glutamate
-
?
L-phenylalanine + 2-oxoglutarate
-
Zymomonas mobilis phenylpyruvate + L-glutamate
-
?
L-tyrosine + 2-oxoglutarate
-
Zymomonas mobilis 3-(4-hydroxyphenyl)-2-oxopropanoate + glutamate
-
?

Subunits

Subunits Comment Organism
dimer 2 * 40000, homodimer, SDS-PAGE Zymomonas mobilis

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
50
-
no loss of activity for 2 min Zymomonas mobilis
55
-
enzyme loses activity when incubated above 55°C for 2 min Zymomonas mobilis

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
8
-
-
Zymomonas mobilis

Cofactor

Cofactor Comment Organism Structure
pyridoxal 5'-phosphate removal of cofactor triggers irreversible denaturation Zymomonas mobilis