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ATP + H2O
ADP + phosphate
-
-
-
?
ATP + H2O + phosphatidylethanolamine/in
ADP + phosphate + phosphatidylethanolamine/out
ATP + H2O + phosphatidylserine/in
ADP + phosphate + phosphatidylserine/out
ATP + H2O
ADP + phosphate
ATP + H2O + 1-oleoyl-2-[6-[(7-nitro-2-1,3-benzoxadiazol-4-yl)amino]hexanoyl]-sn-glycero-3-phosphoserine[side 1]
ADP + phosphate + 1-oleoyl-2-[6-[(7-nitro-2-1,3-benzoxadiazol-4-yl)amino]hexanoyl]-sn-glycero-3-phosphoserine[side 2]
-
-
-
-
?
ATP + H2O + phosphatidylethanolamine/out
ADP + phosphate + phosphatidylethanolamine/in
-
transport from the exoplasmic to the cytosolic leaflet of the plasma membrane
-
-
?
ATP + H2O + phosphatidylserine/out
ADP + phosphate + phosphatidylserine/in
ATP + H2O + phosphatidylserine[side 1]
ADP + phosphate + phosphatidylserine[side 2]
-
-
-
-
?
phosphatidylcholine/out
phosphatidylcholine/in
-
spin-labeled substrate, inward and outward movements, flip and flop, proceed in thermodynamic equilibrium in disc membrane vesicles between inner and out leaflets
-
-
r
phosphatidylethanolamine/out
phosphatidylethanolamine/in
-
spin-labeled substrate, inward and outward movements, flip and flop, proceed in thermodynamic equilibrium in disc membrane vesicles between inner and out leaflets
-
-
r
phosphatidylserine/out
phosphatidylserine/in
-
spin-labeled substrate, inward and outward movements, flip and flop, proceed in thermodynamic equilibrium in disc membrane vesicles between inner and out leaflets
-
-
r
additional information
?
-
ATP + H2O + phosphatidylethanolamine/in
ADP + phosphate + phosphatidylethanolamine/out
-
-
-
?
ATP + H2O + phosphatidylethanolamine/in
ADP + phosphate + phosphatidylethanolamine/out
the enzyme is specific for ATP and shows no activity with GTP, AMP-PNP, GDP, or ADP
-
-
?
ATP + H2O + phosphatidylserine/in
ADP + phosphate + phosphatidylserine/out
-
-
-
?
ATP + H2O + phosphatidylserine/in
ADP + phosphate + phosphatidylserine/out
the enzyme is specific for ATP and shows no activity with GTP, AMP-PNP, GDP, or ADP
-
-
?
ATP + H2O
ADP + phosphate
-
-
-
?
ATP + H2O
ADP + phosphate
-
-
-
?
ATP + H2O
ADP + phosphate
-
-
-
?
ATP + H2O
ADP + phosphate
-
selectively pumps the aminophospholipids phospatidylserine and phosphatidylethanolamine from the outer to the inner monolayer of eukaryotic cells and is predominantly responsible for the asymmetric phospholipid distribution of the plasma membrane
-
-
?
ATP + H2O
ADP + phosphate
phosphatidylserine is essential for the dephosphorylation of the phosphoenzyme intermediate
-
?
ATP + H2O
ADP + phosphate
-
down-regulation of the aminophospholipid translocase activity is an early step in the programmed cell death in lymphocytes, a step that contributes to the appearance of phosphatidylserine on the cell surface as a recognition signal for phagocytosis
-
-
?
ATP + H2O
ADP + phosphate
the enzyme plays an important role in the maintenance of membrane phospholipid asymmetry, observed in plasma membrane and membranes of certain cellular organelles
-
-
?
ATP + H2O
ADP + phosphate
phosphatidylserine is essential for the dephosphorylation of the phosphoenzyme intermediate. Without phosphatidylserine, ATPase II accumulates as phosphoenzyme in the presence of ATP, resulting in the interruption of its catalytic cycle
-
-
?
ATP + H2O + phosphatidylserine/out
ADP + phosphate + phosphatidylserine/in
-
transport from the exoplasmic to the cytosolic leaflet of the plasma membrane
-
-
?
ATP + H2O + phosphatidylserine/out
ADP + phosphate + phosphatidylserine/in
-
transport from the exoplasmic to the cytosolic leaflet of the plasma membrane, and from the lumenal side of granules to the external side
-
-
?
additional information
?
-
Atp8a2 flipps fluorescent-labeled phosphatidylserine from the inner leaflet of liposomes, equivalent to the exocytoplasmic leaflet of cell membranes, to the outer leaflet, equivalent to cytoplasmic leaflet, in an ATP-dependent manner
-
-
?
additional information
?
-
dithionite NBD-lipid assay for detection of flippase activity
-
-
?
additional information
?
-
during the transport across the membrane, the phosphatidylserine head group passes near residue I364. I364 is critical to the release of the transported lipid into the cytosolic leaflet. Transmembrane segment M4 residue N359 is involved in recognition of the lipid substrate on the exoplasmic side. Residue I364 and adjacent hydrophobic residues function as a hydrophobic gate that separates the entry and exit sites of the lipid and directs sequential formation and annihilation of water-filled cavities, thereby enabling transport of the hydrophilic phospholipid head group in a groove outlined by the transmembrane segments M1, M2, M4, and M6, with the hydrocarbon chains following passively, still in the membrane lipid phase
-
-
?
additional information
?
-
-
the enzyme is a P-type ATPase involved in regulation of the lipid asymmetry of the cell membrane
-
-
?
additional information
?
-
-
the enzyme depends on ATP
-
-
?
additional information
?
-
-
no transport activity with phosphatidylinositol
-
-
?
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ATP + H2O + phosphatidylethanolamine/in
ADP + phosphate + phosphatidylethanolamine/out
-
-
-
?
ATP + H2O + phosphatidylserine/in
ADP + phosphate + phosphatidylserine/out
-
-
-
?
ATP + H2O
ADP + phosphate
ATP + H2O + phosphatidylethanolamine/out
ADP + phosphate + phosphatidylethanolamine/in
-
transport from the exoplasmic to the cytosolic leaflet of the plasma membrane
-
-
?
ATP + H2O + phosphatidylserine/out
ADP + phosphate + phosphatidylserine/in
-
transport from the exoplasmic to the cytosolic leaflet of the plasma membrane
-
-
?
ATP + H2O + phosphatidylserine[side 1]
ADP + phosphate + phosphatidylserine[side 2]
-
-
-
-
?
additional information
?
-
ATP + H2O
ADP + phosphate
-
-
-
-
?
ATP + H2O
ADP + phosphate
-
selectively pumps the aminophospholipids phospatidylserine and phosphatidylethanolamine from the outer to the inner monolayer of eukaryotic cells and is predominantly responsible for the asymmetric phospholipid distribution of the plasma membrane
-
-
?
ATP + H2O
ADP + phosphate
-
down-regulation of the aminophospholipid translocase activity is an early step in the programmed cell death in lymphocytes, a step that contributes to the appearance of phosphatidylserine on the cell surface as a recognition signal for phagocytosis
-
-
?
ATP + H2O
ADP + phosphate
the enzyme plays an important role in the maintenance of membrane phospholipid asymmetry, observed in plasma membrane and membranes of certain cellular organelles
-
-
?
ATP + H2O
ADP + phosphate
phosphatidylserine is essential for the dephosphorylation of the phosphoenzyme intermediate. Without phosphatidylserine, ATPase II accumulates as phosphoenzyme in the presence of ATP, resulting in the interruption of its catalytic cycle
-
-
?
additional information
?
-
Atp8a2 flipps fluorescent-labeled phosphatidylserine from the inner leaflet of liposomes, equivalent to the exocytoplasmic leaflet of cell membranes, to the outer leaflet, equivalent to cytoplasmic leaflet, in an ATP-dependent manner
-
-
?
additional information
?
-
-
the enzyme is a P-type ATPase involved in regulation of the lipid asymmetry of the cell membrane
-
-
?
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additional information
additional information
-
0.016
ATP
mutant I364A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.016
ATP
mutant I364S, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.019
ATP
mutant I364Q, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.02
ATP
mutant T369A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.02
ATP
mutant V906A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.023
ATP
mutant N360A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.024
ATP
mutant I362A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.027
ATP
mutant F88A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.036
ATP
mutant Y358A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.038
ATP
wild-type, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.042
ATP
mutant F354A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.045
ATP
mutant L112A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.049
ATP
mutant E371Q, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.049
ATP
mutant K374A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.058
ATP
mutant L361A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.068
ATP
mutant L367A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.073
ATP
mutant I115A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.103
ATP
mutant V906A, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.104
ATP
mutant S365A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.105
ATP
mutant I364S, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.111
ATP
mutant I364E, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.131
ATP
mutant I364A, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.148
ATP
mutant I364M, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.149
ATP
mutant I362A, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.178
ATP
mutant I364F, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.22
ATP
mutant N359A, presence of phosphatidylserine, K0.5 value, pH 7.5, 37°C
0.25
ATP
mutant F88A, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.288
ATP
mutant I364Q, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.292
ATP
mutant I364E, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.369
ATP
mutant I364M, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.371
ATP
wild-type, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.376
ATP
mutant I115A, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.379
ATP
mutant L367A, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.394
ATP
mutant L112A, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
0.862
ATP
mutant S365A, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
1.12
ATP
mutant I364F, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
2.215
ATP
mutant N359A, presence of phosphatidylethanolamine, K0.5 value, pH 7.5, 37°C
additional information
additional information
Michaelis-Menten kinetics, overview
-
additional information
additional information
-
kinetics of inward and outward movements
-
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E371Q
affinity to phosphatidylserine similar to wild-type
F354A
affinity to phosphatidylserine similar to wild-type
F88A
tendency for inhibition at high substrate concentration
I115A
biphasic phosphatidylserine concentration dependence with inhibition at the highest concentration
I362A
increase in the apparent affinity for phosphatidylserine
I364A
80% of wild-type activity
I364E
3-5fold reduction in affinity for phosphatidylserine
I364F
3-5fold reduction in affinity for phosphatidylserine
I364M
3-5fold reduction in affinity for phosphatidylserine
I364Q
activation phase is followed by an inhibition phase at high phosphatidylserine concentration
I364S
30% of wild-type activity
K374A
affinity to phosphatidylserine similar to wild-type
L112A
mutation does not appreciably affect Vmax, the apparent affinities for the substrates, or the phosphorylation rate
L361A
affinity to phosphatidylserine similar to wild-type
L367A
significant reduction in affinity to phosphatidylserine
N359A
dramatic reduction of Vmax to 9-11% of wild-type
N360A
increase in the apparent affinity for phosphatidylserine
P363A
complete loss of activity
S365A
significant reduction in affinity to phosphatidylserine
T369A
increase in the apparent affinity for phosphatidylserine
V906A
pronounced inhibition at high phosphatidylethanol concentration with only a slight inhibition at high phosphatidylserine concentration
Y358A
affinity to phosphatidylserine similar to wild-type
E123A
-
the mutant shows about 80% of wild type activity
E126A
-
the mutant shows about 10% of wild type activity. The mutation leads to reduced glycosylation of the accessory subunit CDC50A
I305A
-
the mutant shows about 50% of wild type activity. The mutation leads to reduced glycosylation of the accessory subunit CDC50A
I362A
-
the mutant shows about 45% of wild type activity
L306A
-
the mutant shows about 60% of wild type activity
L361A
-
the mutant shows about 15% of wild type activity. The mutation leads to reduced glycosylation of the accessory subunit CDC50A
L366A
-
the mutant shows about 40% of wild type activity. The mutation leads to reduced glycosylation of the accessory subunit CDC50A
L367A
-
the mutant shows about 60% of wild type activity
L367F
-
the mutant shows about 10% of wild type activity
L367P
-
the mutant shows about 55% of wild type activity
L367Y
-
the mutant shows about 40% of wild type activity
S1138A
-
the mutant shows reduced activity compared to the wild type enzyme
S1138D
-
the mutant shows slightly reduced activity compared to the wild type enzyme
Y869A
-
the mutant shows about 45% of wild type activity
Y878A
-
the mutant shows about 25% of wild type activity. The mutation leads to reduced glycosylation of the accessory subunit CDC50A
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Daleke, D.L.; Lyles, J.V.
Identification and purification of aminophospholipid flippases
Biochim. Biophys. Acta
1486
108-127
2000
Bos taurus, Homo sapiens
brenda
Devaux, P.F.; Zachowski, A.; Morrot, G.; Cribier, S.; Fellmann, P.; Geldwerth, D.; Bitbol, M.; Herve, P.
Control of the transmembrane phospholipid distribution in eukaryotic cells by aminophospholipid translocase
Biotechnol. Appl. Biochem.
12
517-522
1990
Bos taurus, Cavia porcellus, Homo sapiens, Rattus norvegicus, Sus scrofa
brenda
Tang, X.; Halleck, M.S.; Schlegel, R.A.; Williamson, P.
A subfamily of P-type ATPase with aminophospholipid transporting activity
Science
272
1495-1497
1996
Bos taurus
brenda
Ding, J.; Wu, Z.; Crider, B.P.; Ma, Y.; LI, X.; Slaughter, C.; Gong, L.; Xie, X.S.
Identification and functional expression of four isoforms of ATPase II, the putative aminophospholipid translocase
J. Biol. Chem.
275
23378-13386
2000
Bos taurus (Q29449), Bos taurus
brenda
Devaux, P.F.; Lopez-MOntero, I.; Bryde, S.
Proteins involved in lipid translocation in eukaryotic cells
Chem. Phys. Lipids
141
119-132
2006
Bos taurus, Saccharomyces cerevisiae, Homo sapiens, Leishmania infantum, Rattus norvegicus
brenda
Hessel, E.; Herrmann, A.; Mller, P.; Schmetkamp, P.P.M.; Hofmann, K.P.
The transbilayer distribution of phospholipids in disc membranes is a dynamic equilibrium. Evidence for rapid flip and flop movement
Eur. J. Biochem.
267
1473-1483
2000
Bos taurus
brenda
Coleman, J.A.; Kwok, M.C.; Molday, R.S.
Localization, purification, and functional reconstitution of the P4-ATPase Atp8a2, a phosphatidylserine flippase in photoreceptor disc membranes
J. Biol. Chem.
284
32670-32679
2009
Bos taurus (C7EXK4), Mus musculus (P98200), Homo sapiens (Q9NTI2)
brenda
Vestergaard, A.L.; Coleman, J.A.; Lemmin, T.; Mikkelsen, S.A.; Molday, L.L.; Vilsen, B.; Molday, R.S.; Dal Peraro, M.; Andersen, J.P.
Critical roles of isoleucine-364 and adjacent residues in a hydrophobic gate control of phospholipid transport by the mammalian P4-ATPase ATP8A2
Proc. Natl. Acad. Sci. USA
111
E1334-E1343
2014
Bos taurus (C7EXK4)
brenda
Vestergaard, A.L.; Mikkelsen, S.A.; Coleman, J.A.; Molday, R.S.; Vilsen, B.; Andersen, J.P.
Specific mutations in mammalian P4-ATPase ATP8A2 catalytic subunit entail differential glycosylation of the accessory CDC50A subunit
FEBS Lett.
589
3908-3914
2015
Bos taurus
brenda
Chalat, M.; Moleschi, K.; Molday, R.S.
C-terminus of the P4-ATPase ATP8A2 functions in protein folding and regulation of phospholipid flippase activity
Mol. Biol. Cell
28
452-462
2017
Bos taurus
brenda