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BRENDA support

Ligand sepiapterin

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Basic Ligand Information

Molecular Structure
Picture of sepiapterin (click for magnification)
Molecular Formula
BRENDA Name
InChIKey
Molfile
C9H11N5O3
sepiapterin
VPVOXUSPXFPWBN-VKHMYHEASA-N
Synonyms:
2-amino-6-[(2S)-2-hydroxypropanoyl]-7,8-dihydropteridin-4(1H)-one, 6-(S)-lactoyl-7,8-dihydropterin, L-Sepiapterin

Related pathways

Pathway Source
Pathways

Roles as Enzyme Ligand

In Vivo Substrate in Enzyme-catalyzed Reactions (5 results)

EC NUMBER
PROVEN IN VIVO REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
sepiapterin + H2O = xanthopterin-B2 + NH3
show the reaction diagram
-

In Vivo Product in Enzyme-catalyzed Reactions (1 result)

EC NUMBER
PROVEN IN VIVO REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
1'-oxo-2'-L-hydroxypropyl-tetrahydropterin + NADP+ = L-sepiapterin + NADPH
show the reaction diagram
-
-

Substrate in Enzyme-catalyzed Reactions (13 results)

EC NUMBER
REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
2-amino-6-[(2S)-2-hydroxypropanoyl]-7,8-dihydropteridin-4(1H)-one + H2O = 6-[(2S)-2-hydroxypropanoyl]-7,8-dihydropteridine-2,4(1H,3H)-dione + NH3
show the reaction diagram
-
sepiapterin + H2O = xanthopterin-B2 + NH3
show the reaction diagram
-

Product in Enzyme-catalyzed Reactions (2 results)

EC NUMBER
REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
1'-oxo-2'-L-hydroxypropyl-tetrahydropterin + NADP+ = L-sepiapterin + NADPH
show the reaction diagram
-
-
L-threo-7,8-dihydrobiopterin + NADP+ = sepiapterin + NADPH + H+
show the reaction diagram
-
-

Inhibitor in Enzyme-catalyzed Reactions (6 results)

EC NUMBER
COMMENTARY
LITERATURE
ENZYME 3D STRUCTURE
induction of oxidative stress, p22phox mRNA, endothelial nitric oxide synthase mRNA, and protein by glucose are lowered by concurrent incubation with sepiapterin
-
0.13 mM, 33% inhibition of exchange between free guanine with guanine
-

Enzyme Kinetic Parameters

kcat Value (Turnover Number) (9 results)

EC NUMBER
TURNOVER NUMBER [1/S]
TURNOVER NUMBER MAXIMUM [1/S]
COMMENTARY
LITERATURE
5
-
pH 8.8, 45°C

KM Value (27 results)

EC NUMBER
KM VALUE [MM]
KM VALUE MAXIMUM [MM]
COMMENTARY
LITERATURE
0.59
-
-
0.92
-
pH 7.5, 37ºC

References & Links

Links to other databases for sepiapterin

EXTERNAL LINKS