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BRENDA support

Ligand L-ornithine

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Basic Ligand Information

Molecular Structure
Picture of L-ornithine (click for magnification)
Molecular Formula
BRENDA Name
InChIKey
C5H12N2O2
L-ornithine
AHLPHDHHMVZTML-BYPYZUCNSA-N
Synonyms:
5-amino-L-norvaline, alpha-ornithine, L-2,5-diaminopentanoate, L-alpha-Orn, L-Orn, L-ornithine[side 2], Orn, ornithine
Pathway Source
Pathways


Show all pahtways known for Show all BRENDA pathways known for L-ornithine

Roles as Enzyme Ligand

In Vivo Substrate in Enzyme-catalyzed Reactions (36 results)

EC NUMBER
PROVEN IN VIVO REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
L-ornithine + NADPH + H+ + O2 = N5-hydroxy-L-ornithine + NADP+ + H2O
show the reaction diagram
-
L-ornithine + O2 + H2O = 5-amino-2-oxopentanoate + NH3 + H2O2
show the reaction diagram
-
L-ornithine + O2 + 2 H2O = (2S)-2-hydroxy-5-oxopentanoate + 2 NH3 + H2O2
show the reaction diagram
-
L-ornithine + 2-oxoglutarate + NADPH = N2-(1,3-dicarboxypropyl)-L-ornithine + NADP+ + H2O
show the reaction diagram
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carbamoyl phosphate + L-ornithine = phosphate + N-carbamoyl-L-ornithine
show the reaction diagram
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L-ornithine + guanidinoacetate = L-arginine + glycine
show the reaction diagram
L-ornithine + L-homoarginine = L-arginine + L-lysine
show the reaction diagram
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succinyl-CoA + L-ornithine = CoA + N2-succinyl-L-ornithine
show the reaction diagram
-
benzoyl-CoA + L-ornithine = CoA + N2,N5-dibenzoyl-L-ornithine
show the reaction diagram
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acetyl phosphate + L-ornithine = phosphate + N5-acetyl-L-ornithine
show the reaction diagram
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L-ornithine + a (3R)-3-hydroxyacyl-[acyl-carrier protein] = a lyso-ornithine lipid + a holo-[acyl-carrier protein]
show the reaction diagram
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L-2,5-diaminopentanoate + 2-oxoglutarate = 5-amino-2-oxopentanoate + L-glutamate
show the reaction diagram
-
L-ornithine = putrescine + CO2
show the reaction diagram
-
L-ornithine = putrescine + CO2
show the reaction diagram
-
L-Ornithine = D-Ornithine
show the reaction diagram
-

In Vivo Product in Enzyme-catalyzed Reactions (19 results)

EC NUMBER
PROVEN IN VIVO REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
N2-(D-1-carboxyethyl)-L-ornithine + NADP+ + H2O = L-ornithine + pyruvate + NADPH
show the reaction diagram
-
L-arginine + glycine = L-ornithine + guanidinoacetate
show the reaction diagram
L-arginine + 1-amino-1-deoxy-scyllo-inositol 4-phosphate = L-ornithine + 1-guanidino-1-deoxy-scyllo-inositol 4-phosphate
show the reaction diagram
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L-arginine + L-lysine = L-ornithine + L-homoarginine
show the reaction diagram
-
N2-acetyl-L-ornithine + L-glutamate = L-ornithine + N-acetyl-L-glutamate
show the reaction diagram
[amino group carrier protein LysW]-C-terminal-gamma-(L-ornithyl)-L-glutamate + H2O = [amino group carrier protein LysW]-C-terminal-L-glutamate + L-ornithine
show the reaction diagram
-
L-citrulline + H2O = L-ornithine + CO2 + NH3
show the reaction diagram
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Nomega-hydroxy-L-arginine + H2O = L-ornithine + hydroxyurea
show the reaction diagram

Substrate in Enzyme-catalyzed Reactions (126 results)

EC NUMBER
REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
L-ornithine + H2O + NAD+ = ? + NH3 + NADH
show the reaction diagram
-
L-ornithine + O2 + H2O = ?
show the reaction diagram
-
ornithine + H2O + O2 = ?
show the reaction diagram
-
L-ornithine + H2O + O2 = 2-oxoornithine + NH3 + H2O2
show the reaction diagram
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L-ornithine + H2O + 2 cytochrome b = 2-oxo-5-aminopentanoate + NH3 + 2 reduced cytochrome b
show the reaction diagram
-
L-ornithine + 2-oxoglutarate + NADPH = N2-(1,3-dicarboxypropyl)-L-ornithine + NADP+ + H2O
show the reaction diagram
-
succinyl-CoA + L-ornithine = CoA + N2-succinyl-L-ornithine
show the reaction diagram
-
benzoyl-CoA + L-ornithine = CoA + N2,N5-dibenzoyl-L-ornithine
show the reaction diagram
-
acetyl phosphate + L-ornithine = phosphate + N5-acetyl-L-ornithine
show the reaction diagram
-
L-ornithine + N-acetyl-L-glutamate = N2-acetyl-L-ornithine + L-glutamate
show the reaction diagram
ornithine + casein = ?
show the reaction diagram
-
pyruvate + L-ornithine = L-alanine + ?
show the reaction diagram
-
L-ornithine + 2-oxoglutarate = L-glutamate + (S)-2-amino-5-oxopentanoate
show the reaction diagram
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L-ornithine + 4,5-dioxopentanoate = 5-aminolevulinate + 5-amino-2-oxopentanoate
show the reaction diagram
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L-2,5-diaminopentanoate + 2-oxoglutarate = 5-amino-2-oxopentanoate + L-glutamate
show the reaction diagram
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L-ornithine + 2-oxoglutarate = L-glutamate 5-semialdehyde + L-glutamate
show the reaction diagram
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L-ornithine + 2-oxoglutarate = ?
show the reaction diagram
-
L-ornithine + H2O = ?
show the reaction diagram
-
L-ornithine = 1,4-diaminobutane + CO2
show the reaction diagram
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L-ornithine = ?
show the reaction diagram
-
L-ornithine = ?
show the reaction diagram
-
L-ornithine = putrescine + CO2
show the reaction diagram
-
L-ornithine = ?
show the reaction diagram
-
L-Ornithine = D-Ornithine
show the reaction diagram
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L-Ornithine = D-Ornithine
show the reaction diagram
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ATP + UDP-N-acetylmuramoyl-L-alanyl-D-glutamate + L-ornithine = ADP + phosphate + UDP-N-acetylmuramoyl-L-alanyl-D-gamma-glutamyl-L-ornithine
show the reaction diagram
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ATP + gamma-L-Glu-L-Cys + L-Orn = ADP + phosphate + gamma-Glu-L-Cys-L-Orn
show the reaction diagram
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ATP + H2O + L-Orn/out = ADP + phosphate + L-Orn/in
show the reaction diagram
-

Product in Enzyme-catalyzed Reactions (84 results)

EC NUMBER
REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
alpha-N-(5'-phospho-4'-pyridoxyl)-ornithine + O2 + H2O = pyridoxal 5'-phosphate + alpha-ornithine + H2O2
show the reaction diagram
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N2-(D-1-carboxyethyl)-L-ornithine + NADP+ + H2O = L-ornithine + pyruvate + NADPH
show the reaction diagram
-
L-arginine + L-lysine = L-ornithine + L-homoarginine
show the reaction diagram
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Orn-7-amido-4-methylcoumarin + H2O = Orn + 7-amino-4-methylcoumarin
show the reaction diagram
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aminoacyl-L-ornithine + H2O = L-ornithine + acylamine
show the reaction diagram
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hippuryl-L-Orn + H2O = hippuric acid + Orn
show the reaction diagram
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L-Orn-L-Leu-D-Phe-L-Pro-L-Val-OH + H2O = L-Orn + L-Val + L-Leu-D-Phe-L-Pro-OH
show the reaction diagram
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[amino group carrier protein LysW]-C-terminal-gamma-(L-ornithyl)-L-glutamate + H2O = [amino group carrier protein LysW]-C-terminal-L-glutamate + L-ornithine
show the reaction diagram
-
N-acetyl-L-ornithine + H2O = acetate + L-ornithine
show the reaction diagram
-
N-carbamoyl-L-ornithine + H2O = L-ornithine + CO2 + NH3
show the reaction diagram
-
N2-acetyl-L-ornithine + H2O = L-ornithine + acetate
show the reaction diagram
-
L-arginine + H2O = L-ornithine + urea
show the reaction diagram
-
Nomega-hydroxy-L-arginine + H2O = L-ornithine + hydroxyurea
show the reaction diagram
L-arginine + H2O = L-ornithine + urea
show the reaction diagram
-
D-ornithine = L-ornithine
show the reaction diagram
-
D-ornithine = L-ornithine
show the reaction diagram
-
D-ornithine = L-ornithine
show the reaction diagram
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Activator in Enzyme-catalyzed Reactions (106 results)

EC NUMBER
COMMENTARY
LITERATURE
ENZYME 3D STRUCTURE
at low concentrations of L-lysine
-
activates 5fold
-
stimulates, but remains unchanged
-
stimulation, 112% of non-stimulated activity
-
but it inhibits at concentrations about 14 mM agmatine
1 mM, relative activity 120%
-

Inhibitor in Enzyme-catalyzed Reactions (119 results)

EC NUMBER
COMMENTARY
LITERATURE
ENZYME 3D STRUCTURE
at low concentration of L-lysine reaction is stimulated by L-ornithine, at high concentrations of L-lysine it is inhibited
-
inhibits only the short enzyme form
-
inhibition 10% by 10 mM L-ornithine
-
83% activity in the presence of 10 mM L-ornithine
-
pH 7.6, 30°C
-
competitive inhibition versus saccharopine and uncompetitive inhibition versus NADP+
-
product inhibition, most potent competitive inhibitor
-
weak, suicide substrate in the presence of casein
-
10-25% inhibition with 5 mM; 10-25% inhibition with 5 mM; 10-25% inhibition with 5 mM
-
20% inhibition
-
mixed inhibition with respect to delta-aminovalerate, competitive inhibition to 2-oxoglutarate
-
10 mM, 64% inhibition
-
12 mM, 10% inhibition
-
weak
-
product inhibition
-
noncompetitive inhibitor
inhibition of Lys decarboxylation
-
competitive
-
inactivated by preliminary incubation at pH 10.0. The inactivation is prevented and the inactivated enzyme is reactivated by addition of pyruvate or oxaloacetate
-
poor inhibitor
-
competitive versus L-lysine
-

3D Structure of Enzyme-Ligand-Complex (PDB) (245 results)

EC NUMBER
ENZYME 3D STRUCTURE

Enzyme Kinetic Parameters

kcat Value (Turnover Number) (128 results)

EC NUMBER
TURNOVER NUMBER [1/S]
TURNOVER NUMBER MAXIMUM [1/S]
COMMENTARY
LITERATURE
0.0198
-
wild type enzyme, in 50 mM Tris-HCl buffer, pH 8.0, at 25°C
0.82
-
25°C, pH 9.5
2.44
-
pH 8.0, 65°C
3.5
-
pH 8.0, temperature not specified in the publication
0.04
-
at pH 7.5, 70°C
0.54
-
DABA AT/DC fusion protein
1.83
-
pH 8.0, 30°C, recombinant wild-type enzyme

KM Value (305 results)

EC NUMBER
KM VALUE [MM]
KM VALUE MAXIMUM [MM]
COMMENTARY
LITERATURE
0.33
-
wild type enzyme, in 50 mM Tris-HCl buffer, pH 8.0, at 25°C
3.7
-
-
13
-
-
0.011
-
-
0.04
-
-
1.32
-
-
1.5
-
-
1.35
-
-
2.9
-
-
2
-
pH 8.0, 37°C
7.95
-
pH 8.0, 65°C
4.391
-
pH 8.0, temperature not specified in the publication
40
-
-
11.1
-
DABA AT/DC fusion protein
27
-
pH 8.0, 30°C, recombinant wild-type enzyme
27
-
at 68°C

Ki Value (29 results)

EC NUMBER
KI VALUE [MM]
KI VALUE MAXIMUM [MM]
COMMENTARY
LITERATURE
5.4
-
pH 7.4
12.5
-
pH 7.6, 30°C
5
-
at pH 7.0
0.46
-
-
0.46
-
forward reaction with 4-aminobutanoate and pyruvate, pH 9.0, 30°C
4.3
-
pH 8.5

IC50 Value (7 results)

EC NUMBER
IC50 VALUE
IC50 VALUE MAXIMUM
COMMENTARY
LITERATURE
5
-
pH 7.5, 22°C, recombinant wild-type enzyme
0.7
-
pH 8.5, 21°C

References & Links