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Information on EC 7.6.2.1 - P-type phospholipid transporter and Organism(s) Bos taurus and UniProt Accession C7EXK4

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IUBMB Comments
A P-type ATPase that undergoes covalent phosphorylation during the transport cycle. Different forms of the enzyme move phospholipids such as phosphatidylcholine, lyso-phosphatidylcholine, phosphatidylserine, phosphatidylethanolamine, phosphatidyglycerol, sphingomyelin and glucosylceramide from one membrane face to the other ('flippase').
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This record set is specific for:
Bos taurus
UNIPROT: C7EXK4
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Word Map
The taxonomic range for the selected organisms is: Bos taurus
The expected taxonomic range for this enzyme is: Eukaryota, Archaea, Bacteria
Synonyms
mg2+-atpase, abcb4, flippase, plscr1, atp8b1, scramblase, aminophospholipid translocase, ala12, tat-2, drs2p, more
SYNONYM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
P4-ATPase
-
phosphatidylserine flippase
-
phospholipid-transporting ATPase IB
-
aminophospholipid flippase
-
-
-
-
aminophospholipid flippase 10
-
-
-
-
aminophospholipid flippase 11
-
-
-
-
aminophospholipid flippase 12
-
-
-
-
aminophospholipid translocase
aminophospholipid translocase VC
-
-
-
-
APLT
-
-
ATP8A1
-
-
Atp8a2
ATPase II
ATPVC
-
-
-
-
ATPVD
-
-
-
-
CDC50A
-
accessory subunit
flippase
HUSSY-20
-
-
-
-
Mg2+-ATPase
-
-
-
-
Mg2+-ATPase A
-
-
-
-
P4-ATPase
-
-
phosphatidylserine flippase
-
-
phospholipid flippase
-
-
additional information
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
ATP + H2O + phospholipid [side 1] = ADP + phosphate + phospholipid [side 2]
show the reaction diagram
P-type ATPase
REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
hydrolysis of phosphoric ester
-
-
-
-
transmembrane transport
-
-
-
-
SYSTEMATIC NAME
IUBMB Comments
ATP phosphohydrolase (P-type, phospholipid-flipping)
A P-type ATPase that undergoes covalent phosphorylation during the transport cycle. Different forms of the enzyme move phospholipids such as phosphatidylcholine, lyso-phosphatidylcholine, phosphatidylserine, phosphatidylethanolamine, phosphatidyglycerol, sphingomyelin and glucosylceramide from one membrane face to the other ('flippase').
CAS REGISTRY NUMBER
COMMENTARY hide
9000-83-3
-
SUBSTRATE
PRODUCT                       
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
ATP + H2O
ADP + phosphate
show the reaction diagram
-
-
-
?
ATP + H2O + phosphatidylethanolamine/in
ADP + phosphate + phosphatidylethanolamine/out
show the reaction diagram
ATP + H2O + phosphatidylserine/in
ADP + phosphate + phosphatidylserine/out
show the reaction diagram
ATP + H2O
ADP + phosphate
show the reaction diagram
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]
show the reaction diagram
-
-
-
-
?
ATP + H2O + phosphatidylethanolamine/out
ADP + phosphate + phosphatidylethanolamine/in
show the reaction diagram
-
transport from the exoplasmic to the cytosolic leaflet of the plasma membrane
-
-
?
ATP + H2O + phosphatidylserine/out
ADP + phosphate + phosphatidylserine/in
show the reaction diagram
ATP + H2O + phosphatidylserine[side 1]
ADP + phosphate + phosphatidylserine[side 2]
show the reaction diagram
-
-
-
-
?
phosphatidylcholine/out
phosphatidylcholine/in
show the reaction diagram
-
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
show the reaction diagram
-
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
show the reaction diagram
-
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
?
-
NATURAL SUBSTRATE
NATURAL PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
ATP + H2O + phosphatidylethanolamine/in
ADP + phosphate + phosphatidylethanolamine/out
show the reaction diagram
-
-
-
?
ATP + H2O + phosphatidylserine/in
ADP + phosphate + phosphatidylserine/out
show the reaction diagram
-
-
-
?
ATP + H2O
ADP + phosphate
show the reaction diagram
ATP + H2O + phosphatidylethanolamine/out
ADP + phosphate + phosphatidylethanolamine/in
show the reaction diagram
-
transport from the exoplasmic to the cytosolic leaflet of the plasma membrane
-
-
?
ATP + H2O + phosphatidylserine/out
ADP + phosphate + phosphatidylserine/in
show the reaction diagram
-
transport from the exoplasmic to the cytosolic leaflet of the plasma membrane
-
-
?
ATP + H2O + phosphatidylserine[side 1]
ADP + phosphate + phosphatidylserine[side 2]
show the reaction diagram
-
-
-
-
?
additional information
?
-
METALS and IONS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
Mg2+
required
Mg2+
-
dependent on
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
NEM
over 90% inhibition of ATPase activity at 1 mM
vanadate
over 90% inhibition of ATPase activity at 0.1 mM
Ca2+
-
-
vanadate
additional information
-
ACTIVATING COMPOUND
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
phosphatidylethanolamine
activates to a lesser degree
phosphatidylserine
phosphatidylserine
-
-
additional information
-
KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
0.016 - 2.215
ATP
additional information
additional information
-
IC50 VALUE [mM]
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
2.75
Ca2+
Bos taurus
-
at pH and °C
SPECIFIC ACTIVITY [µmol/min/mg]
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
0.054
purified native enzyme, pH 7.5, 37°C
35
purified native enzyme reconstituted in lipid vesicles, pH 7.5, 37°C
additional information
-
translocation velocity and phospholipid distribution in the membrane leaflets
pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
7 - 9
with substrate phosphatidylserine
8
with substrate phosphatidylethanolamine
7.4
-
assay at
TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
23
flippase assay at
37
ATPase assay at
25
-
assay at
ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
SOURCE TISSUE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
SOURCE
disc membranes
Manually annotated by BRENDA team
outer segment disc membranes of rod and cone photoreceptor cells, high expression of atp8a2
Manually annotated by BRENDA team
high expression of atp8a2
Manually annotated by BRENDA team
-
epithelial cells
Manually annotated by BRENDA team
-
-
Manually annotated by BRENDA team
additional information
localization study by immunofluorescence microscopy
Manually annotated by BRENDA team
LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY hide
GeneOntology No.
LITERATURE
SOURCE
-
of rod outer segment
Manually annotated by BRENDA team
additional information
GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
physiological function
P4-ATPases in general are implicated in the energy-dependent translocation of aminophospholipids across cell membranes. Atp8a2 is implicated in the generation and maintenance of phosphatidylserine asymmetry in photoreceptor disc membranes
UNIPROT
ENTRY NAME
ORGANISM
NO. OF AA
NO. OF TRANSM. HELICES
MOLECULAR WEIGHT[Da]
SOURCE
SEQUENCE
LOCALIZATION PREDICTION?
AT8A2_BOVIN
1148
8
129037
Swiss-Prot
other Location (Reliability: 2)
MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
132000
x * 132000, recombinant enzyme, SDS-PAGE
SUBUNIT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
?
x * 132000, recombinant enzyme, SDS-PAGE
?
-
x * 120000, SDS-PAGE
POSTTRANSLATIONAL MODIFICATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
phosphoprotein
-
the enzyme undergoes phosphorylation on the serine residue within a CaMKII target motif
PROTEIN VARIANTS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
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
E198Q
-
inactive
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
PURIFICATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
native Atp8a2 1887fold from photoreceptor outer segments by immunoaffinity chromatography
ATP8A1 from chromaffin granules
-
Sepharose bead column chromatography
-
CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
gene atp8a2, DNA and amino acid sequence determination and analysis, expression of 1D4-tagged Atp8a2 in HEK-293 cells
expressed in HEK-293T cells
-
expressed in PC-12 cells and HEK-293T cells
-
RENATURED/Commentary
ORGANISM
UNIPROT
LITERATURE
purified Atp8a2 is reconstituted into liposomes containing fluorescent-labeled phosphatidylserine to measure the ability of Atp8a2 to flip phosphatidylserine across the lipid bilayer. 30% of the reconstituted Atp8a2 is inaccessible to trypsin and correspondingly ATP
REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Daleke, D.L.; Lyles, J.V.
Identification and purification of aminophospholipid flippases
Biochim. Biophys. Acta
1486
108-127
2000
Bos taurus, Homo sapiens
Manually annotated by BRENDA team
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
Manually annotated by BRENDA team
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
Manually annotated by BRENDA team
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
Manually annotated by BRENDA team
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
Manually annotated by BRENDA team
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
Manually annotated by BRENDA team
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)
Manually annotated by BRENDA team
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)
Manually annotated by BRENDA team
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
Manually annotated by BRENDA team
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
Manually annotated by BRENDA team