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Literature summary for 1.14.15.20 extracted from

  • Gisk, B.; Yasui, Y.; Kohchi, T.; Frankenberg-Dinkel, N.
    Characterization of the heme oxygenase protein family in Arabidopsis thaliana reveals a diversity of functions (2010), Biochem. J., 425, 425-434.
    View publication on PubMed

Activating Compound

Activating Compound Comment Organism Structure
L-ascorbate adding of a second electron donor, such as ascorbate, led to a 10fold increase in the heme conversion rate Arabidopsis thaliana

Cloned(Commentary)

Cloned (Comment) Organism
expressed in Nicotiana benthamiana and Escherichia coli BL21 (DE3) cells Arabidopsis thaliana

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.0013
-
protoheme isoform HY1, at pH 7.2 and 25°C Arabidopsis thaliana
0.0027
-
protoheme isoform HO3, at pH 7.2 and 25°C Arabidopsis thaliana
0.0057
-
protoheme isoform HO4, at pH 7.2 and 25°C Arabidopsis thaliana

Localization

Localization Comment Organism GeneOntology No. Textmining
chloroplast
-
Arabidopsis thaliana 9507
-
nucleus
-
Arabidopsis thaliana 5634
-
plastid isoforms HY1, HO3 and HO4 Arabidopsis thaliana 9536
-

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
protoheme + reduced ferredoxin [iron-sulfur] cluster + O2 + H+ Arabidopsis thaliana
-
biliverdin IXalpha + Fe2+ + CO + oxidized ferredoxin [iron-sulfur] cluster + H2O
-
?

Organism

Organism UniProt Comment Textmining
Arabidopsis thaliana
-
-
-

Purification (Commentary)

Purification (Comment) Organism
Talon-cobalt-affinity column chromatography Arabidopsis thaliana

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
protoheme + reduced ferredoxin [iron-sulfur] cluster + O2 + H+
-
Arabidopsis thaliana biliverdin IXalpha + Fe2+ + CO + oxidized ferredoxin [iron-sulfur] cluster + H2O
-
?

Subunits

Subunits Comment Organism
monomer
-
Arabidopsis thaliana

Synonyms

Synonyms Comment Organism
haem oxygenase
-
Arabidopsis thaliana
Ho1
-
Arabidopsis thaliana
Ho3
-
Arabidopsis thaliana
HO4
-
Arabidopsis thaliana
HY1
-
Arabidopsis thaliana

Temperature Range [°C]

Temperature Minimum [°C] Temperature Maximum [°C] Comment Organism
10 45 the relative enzyme activity increases between 10°C and 45°C Arabidopsis thaliana

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7
-
isoform HO3 Arabidopsis thaliana
7.3
-
isoforms HO4 and HY1 Arabidopsis thaliana