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Ligand arsenate

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Basic Ligand Information

Molecular Structure
Picture of arsenate (click for magnification)
Molecular Formula
BRENDA Name
InChIKey
H3AsO4
arsenate
DJHGAFSJWGLOIV-UHFFFAOYSA-K
Synonyms:
Arsenate ion, arsenic acid, AsO4, AsO43-, HAsO42-


Show all pahtways known for Show all BRENDA pathways known for arsenate

Roles as Enzyme Ligand

In Vivo Substrate in Enzyme-catalyzed Reactions (10 results)

EC NUMBER
PROVEN IN VIVO REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
D-glyceraldehyde 3-phosphate + arsenate + NAD+ = 1-arsono-3-phospho-D-glycerate + NADH + H+
show the reaction diagram
-
arsenate + thioredoxin = arsenite + thioredoxin disulfide + H2O
show the reaction diagram
-

In Vivo Product in Enzyme-catalyzed Reactions (7 results)

EC NUMBER
PROVEN IN VIVO REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
arsenite + acceptor = arsenate + reduced acceptor
show the reaction diagram
-

Substrate in Enzyme-catalyzed Reactions (65 results)

EC NUMBER
REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
D-glyceraldehyde 3-phosphate + arsenate + NADP+ = 3-phospho-D-glyceroyl arsenate + NADPH
show the reaction diagram
-
pyruvate + arsenate + O2 + H2O = acetyl arsenate + CO2 + H2O2
show the reaction diagram
-
arsenate + glutathione = arsenite + reduced glutathione
show the reaction diagram
-
arsenate + thioredoxin = arsenite + thioredoxin disulfide + H2O
show the reaction diagram
-
arsenate + azurin(red) = arsenite + H2O + azurin(ox)
show the reaction diagram
-
arsenate + L-citrulline = carbamoylarsenate + L-ornithine
show the reaction diagram
-
arsenate + N-carbamoylputrescine = ?
show the reaction diagram
-
maltohexaose + arsenate = maltopentaose + glucose 1-arsenate
show the reaction diagram
-
cellobiose + arsenate = D-glucose + alpha-D-glucose 1-arsenate
show the reaction diagram
-
maltose + arsenate = D-glucose + D-glucose + arsenate
show the reaction diagram
-
uric acid ribonucleoside + arsenate = urate + D-ribose 1-phosphate
show the reaction diagram
-
S-methyl-5'-thioadenosine + arsenate = adenine + S-methyl-5-thio-alpha-D-ribose 1-arsenate
show the reaction diagram
-
uridine + arsenate = ?
show the reaction diagram
-
thymidine + arsenate = ?
show the reaction diagram
-
arsenate + D-fructose 1,6-bisphosphate = ?
show the reaction diagram
-
CTP + arsenate = diphosphate + ?
show the reaction diagram
-
ATP + pyruvate + arsenate = ?
show the reaction diagram
-
ATP + H2O + arsenate/out = ADP + phosphate + arsenate/in
show the reaction diagram
-
ATP + H2O + arsenate/in = ADP + phosphate + arsenate/out
show the reaction diagram
-

Product in Enzyme-catalyzed Reactions (17 results)

EC NUMBER
REACTION
REACTION DIAGRAM
LITERATURE
ENZYME 3D STRUCTURE
arsenite + acceptor = arsenate + reduced acceptor
show the reaction diagram
-
maltose + arsenate = D-glucose + D-glucose + arsenate
show the reaction diagram
-
ATP + H2O + arsenate/out = ADP + phosphate + arsenate/in
show the reaction diagram
-
ATP + H2O + arsenate/in = ADP + phosphate + arsenate/out
show the reaction diagram
-

Activator in Enzyme-catalyzed Reactions (22 results)

EC NUMBER
COMMENTARY
LITERATURE
ENZYME 3D STRUCTURE
increasing activity up to 0.1 M, inhibition of ferricyanide-linked assay above 0.1 M
-
activates less than phosphate
-
best at 10 mM and up to 30 mM
-
10 mM increases enzyme activity by 1.6fold
-
absolutely required for protein C activity
-
crude enzyme fractions: pyruvate, ferredoxin, CoA and phosphate or arsenate required for maximal activity
-
0.8 mM 104% activity
-
potent activator in the concentration range of 0-10 mM
-
activation, less effective than phosphate
-
50 mM, 2.9fold activation of cytosolic PFK
-
hyperbolic activation curve, 13% activation at 25 mM, 87% activation at 500 mM
-
in absence of reducing agents
-
causes further enhancement of enzyme activity when added iin 1-10 mM amounts in the standard assay medium containing KCl. Activity with 12 mM arsenate, is threefold higher than the original aldolase activity
-
activates
-
increasemM s activity
-
activates gamma-glutamyl transferase reaction
-

Inhibitor in Enzyme-catalyzed Reactions (74 results)

EC NUMBER
COMMENTARY
LITERATURE
ENZYME 3D STRUCTURE
uncompetitive inhibition
-
inhibition of glycolate-ferricyanide or glyoxylate-ferricyanide assay above 0.1 M
-
competitive inhibitor
-
the enzyme is allosterically inhibited at concentrations above 10 mM
-
linear substrate inhibition, competitive versus phosphate
-
addition of any of the neutral salts causes a parabolic inhibition. A direct comparison of arsenate and chloride ion shows that arsenate is not as inhibitory even though it has a higher ionic strength. Arsenate interacts with the enzyme differently from chloride and bromide. Sulfate, which is a large ion like arsenate, is as inhibitory as chloride (at equivalent ionic strength) with NAD+ as coenzyme, but it is much less effective than chloride with NADP+ as coenzyme
-
complete inhibition of activity in either direction
-
100 mM, EPR spectra
-
weak
-
competitive vs. carbamoylphosphate, noncompetitive vs. ornithine
-
competitive vs. carbamoylphosphate
-
catalytically active 51 kDa C fragment of hexokinase
-
strong competitive inhibitor
-
40% inhibition at 1 mM
-
10 mM, 10% inhibition
-
competitive. 10 mM, 39% residual activity
-
inhibition of protein tyrosine phosphatase activity
-
organometallic complexes composed of humic acid and arsenic acid show enhanced inhibition of plasmin activity as compared with either arsenic or humic acid alone
-
0.5 M, 74% inhibition
-
strong inhibition for formamidase I, slight inhibition for formamidase II at 1 mM
-
slight inhibition
-
inhibition of 5-aminolevulinic acid dehydratase activity by arsenic in excised etiolated maize leaf segments during greening. KNO3, chloramphenical, cycloheximide, DTNB and levulinic aciddecrease inhibition. GSH increase inhibition
-
1 mM, 92% of initial activity
-

Metals and Ions (12 results)

EC NUMBER
COMMENTARY
LITERATURE
ENZYME 3D STRUCTURE
activation
-
or phosphate is required
-
stimulates at 10 mM, 1 mM and 0.1 mM
-
50 mM, 800% of the relative activity without addition
-
activates
-
increases storage stability
-

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

EC NUMBER
ENZYME 3D STRUCTURE

Enzyme Kinetic Parameters

kcat Value (Turnover Number) (49 results)

EC NUMBER
TURNOVER NUMBER [1/S]
TURNOVER NUMBER MAXIMUM [1/S]
COMMENTARY
LITERATURE
14400
-
-
4.9
-
maltohexaose arsenolysis
1.15
-
-

KM Value (77 results)

EC NUMBER
KM VALUE [MM]
KM VALUE MAXIMUM [MM]
COMMENTARY
LITERATURE
1.25
-
electron acceptor: oxygen
109
-
-
0.3
-
-
0.793
-
-
4
-
arsenolytic cleavage
22.7
-
maltohexaose arsenolysis
1.7
-
-
1.3
-
-

Ki Value (38 results)

EC NUMBER
KI VALUE [MM]
KI VALUE MAXIMUM [MM]
COMMENTARY
LITERATURE
0.12
-
-
93
-
pH 8.0, temperature not specified in the publication, recombinant His-tagged wild-type enzyme
12
-
-
0.6
-
pH 3.5, 37°C

References & Links

Links to other databases for arsenate

ChEBI
PubChem
ChEBI
PubChem