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1.14.14.18: heme oxygenase (biliverdin-producing)

This is an abbreviated version!
For detailed information about heme oxygenase (biliverdin-producing), go to the full flat file.

Word Map on EC 1.14.14.18

Reaction

protoheme
+ 3 [reduced NADPH-hemoprotein reductase] + 3 O2 =
Biliverdin
+
Fe2+
+
CO
+ 3 [oxidized NADPH-hemoprotein reductase] + 3 H2O

Synonyms

biliverdin-producing heme oxygenase, ChuS, ChuZ, EC 1.14.99.3, haem oxygenase, heme oxygenase, heme oxygenase 1, heme oxygenase 2, heme oxygenase-1, heme oxygenase-2, HemO, Hmox1, Hmox1a, Hmox1b, Hmox2, Hmox2a, Hmox2b, HmuO, Hmx1, HO, HO-1, HO-2, Ho1, Ho2, Ho3, HO4, HSP32, HugZ, HY1, inducible heme oxygenase-1, More, MsHO1, ORP33 proteins, oxygenase, heme (decyclizing), pbsA1, PigA, proteins, specific or class, ORP33 (oxygen-regulated protein 33,000-mol.-wt.), Syn HO-1, Syn HO-2

ECTree

     1 Oxidoreductases
         1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen
             1.14.14 With reduced flavin or flavoprotein as one donor, and incorporation of one atom of oxygen into the other donor
                1.14.14.18 heme oxygenase (biliverdin-producing)

Activating Compound

Activating Compound on EC 1.14.14.18 - heme oxygenase (biliverdin-producing)

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ACTIVATING COMPOUND
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
2,4,6-Trinitrobenzene sulfonic acid
induces HO-1 expression in the colon and stimulates its catalytic activity
5-aminosalicylic acid
induces HO-1 expression in the colon and stimulates its catalytic activity
ascorbate
-
addition of a second electron donor like ascorbate leads to 10times faster heme conversion
brazilin
-
main constituent of Caesalpinia sappan, induces HO-1 expression in a concentration-dependent manner at 0.01-0.3 mM at the level of protein synthesis, thus without affecting mRNA transcription of HO-1
Calmodulin
-
calcium-dependent binding to enzyme, 3fold increase in catalytic activity
Co protoporphyrin IX
activates and induces HO-1
Co-protoporphyrin
-
cobalt protoporphyrin IX
-
1 mg/kg, 5.9fold increase of activity
cobalt protoporphyrin IX chloride
Copp, a HO-1 activator
cysteine
-
0.1 mM, slight stimulation, inhibition at 1 mM
Fe/S cluster
-
heme oxygenase consists of 3 required protein components: a ferredoxin-like Fe-S cluster protein that can be replaced by ferredoxin, a protein that is inactivated by diethyldicarbonate, inactivation is blocked by heme, a protein with ferredoxin-linked cytochrome c reductase activity
heme
-
-
lipopolysaccharide
-
activates the enzyme, activation is partly reduced by addition of inhibitor Sn-protoporphyrin
propionate
-
the enzyme requires only a single propionate interacting with the buried terminus of Lys16 to exhibit full activity, and it tolerates the existence of a propionate at the exposed 8-position
sildenafil
-
-
SnCl2
is a potent and specific inducer of renal HO-1 expression and activity
tadalafil
-
-
vardenafil
-
-
additional information
-