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Ligand menaquinone

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Basic Ligand Information

Molecular Structure
Picture of menaquinone (click for magnification)
Molecular Formula
BRENDA Name
InChIKey
C21H24O2
menaquinone
PTWSIIUEOFZCHW-NTCAYCPXSA-N
Synonyms:
a menaquinone
Pathway Source
Pathways


Show all pahtways known for Show all BRENDA pathways known for menaquinone

Roles as Enzyme Ligand

In Vivo Substrate in Enzyme-catalyzed Reactions (12 results)

EC NUMBER
PROVEN IN VIVO REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
menaquinone + reduced coenzyme F420 = menaquinol + oxidized coenzyme F420
show the reaction diagram
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protoporphyrinogen IX + 3 menaquinone = protoporphyrin IX + 3 menaquinol
show the reaction diagram
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dimethylsulfide + menaquinone + H2O = dimethylsulfoxide + menaquinol
show the reaction diagram
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peptidyl-L-glutamate + CO2 + O2 + menaquinone = ?
show the reaction diagram
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succinate + menaquinone + 2 H+[side 1] = fumarate + menaquinol + 2 H+[side 2]
show the reaction diagram
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NADH + H+ + menaquinone = NAD+ + menaquinol
show the reaction diagram
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In Vivo Product in Enzyme-catalyzed Reactions (7 results)

EC NUMBER
PROVEN IN VIVO REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
NO + menaquinol = N2O + H2O + menaquinone
show the reaction diagram
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dimethylsulfoxide + menaquinol = dimethylsulfide + menaquinone + H2O
show the reaction diagram
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fumarate + menaquinol + 2 H+[side 2] = succinate + menaquinone + 2 H+[side 1]
show the reaction diagram
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menaquinol + O2 + H+[side 1] = menaquinone + H2O + H+[side 2]
show the reaction diagram
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menaquinol + O2 = menaquinone + H2O
show the reaction diagram
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Substrate in Enzyme-catalyzed Reactions (21 results)

EC NUMBER
REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
menaquinone + reduced coenzyme F420 = menaquinol + oxidized coenzyme F420
show the reaction diagram
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H2 + menaquinone = menaquinol
show the reaction diagram
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pyruvate + menaquinone + H2O = acetate + CO2 + menaquinol
show the reaction diagram
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protoporphyrinogen IX + 3 menaquinone = protoporphyrin IX + 3 menaquinol
show the reaction diagram
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trans-4-hydroxy-L-proline + menaquinone = (3R,5S)-3-hydroxy-1-pyrroline-5-carboxylate + menaquinol
show the reaction diagram
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NADH + H+ + menaquinone = NAD+ + menaquinol
show the reaction diagram
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nitrite + menaquinone + H2O = nitrate + menaquinol
show the reaction diagram
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dimethylsulfide + menaquinone + H2O = dimethylsulfoxide + menaquinol
show the reaction diagram
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sulfite + hydrogen sulfide + menaquinone = thiosulfate + menaquinol
show the reaction diagram
-
peptidyl-L-glutamate + CO2 + O2 + menaquinone = ?
show the reaction diagram
-
succinate + menaquinone + 2 H+[side 1] = fumarate + menaquinol + 2 H+[side 2]
show the reaction diagram
-
NADH + menaquinone = NAD+ + reduced menaquinone
show the reaction diagram
-

Product in Enzyme-catalyzed Reactions (16 results)

EC NUMBER
REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
propylene + menaquinol + O2 = propylene oxide + menaquinone + H2O
show the reaction diagram
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NO + menaquinol = N2O + H2O + menaquinone
show the reaction diagram
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nitrate + menaquinol = nitrite + menaquinone + H2O
show the reaction diagram
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thiosulfate + menaquinol = sulfite + hydrogen sulfide + menaquinone
show the reaction diagram
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fumarate + menaquinol + 2 H+[side 2] = succinate + menaquinone + 2 H+[side 1]
show the reaction diagram
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menaquinol + O2 + H+[side 1] = menaquinone + H2O + H+[side 2]
show the reaction diagram
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menaquinol + O2 = menaquinone + H2O
show the reaction diagram
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menaquinol + 2 ferricytochrome c = menaquinone + 2 ferrocytochrome c + 2 H+
show the reaction diagram
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Enzyme Cofactor/Cosubstrate (8 results)

EC NUMBER
COMMENTARY
LITERATURE
ENZYME 3D STRUCTURE
the structure demonstrates 11 redox centers, including molybdopterin-guanine dinucleotides, five [4Fe-4S] clusters, two heme b groups, and a menaquinone analog. These redox centers are aligned in a single chain, which extends almost 90 A through the enzyme. In the catalytic site, the Mo directly takes up electrons from the bound substrate. These electrons are transferred to the beta subunit through the [4Fe4S] cluster (FeS-0) in the alpha subunit. The four [4Fe-4S] clusters in the beta subunit, which are aligned in the order of FeS-1, FeS-4, FeS-2, and FeS-3, connect the alpha and gamma subunits like an electric wire. From FeS-3 of the beta subunit, electrons are transferred to heme bP (P for periplasm) in the gamma subunit and then across the membrane to heme bC (C for cytoplasm). Menaquinone binds to a histidine ligand (Hisg169) of heme bC and can directly accept electrons through this residue
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active in 4-hydroxybenzyl alcohol oxidation
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membrane-bound menaquinone
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one menaquinone molecule is bound near heme bL in the hydrophobic subunit C
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predominant menaquinone is MK-7
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there are more than one menaquinol binding sites in NarGHI
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Activator in Enzyme-catalyzed Reactions (1 result)

EC NUMBER
COMMENTARY
LITERATURE
ENZYME 3D STRUCTURE

Inhibitor in Enzyme-catalyzed Reactions (1 result)

EC NUMBER
COMMENTARY
LITERATURE
ENZYME 3D STRUCTURE

Enzyme Kinetic Parameters

kcat Value (Turnover Number) (2 results)

EC NUMBER
TURNOVER NUMBER [1/S]
TURNOVER NUMBER MAXIMUM [1/S]
COMMENTARY
LITERATURE
0.28
-
at pH 7.5 and 25°C
423
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pH 7.0, temperature not specified in the publication

KM Value (6 results)

EC NUMBER
KM VALUE [MM]
KM VALUE MAXIMUM [MM]
COMMENTARY
LITERATURE
0.0173
-
recombinant His-tagged enzyme, pH and temperature not specified in the publication
0.025
-
at pH 7.5 and 25°C

References & Links

Links to other databases for menaquinone

ChEBI
PubChem
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PubChem