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Information on EC 2.7.8.2 - diacylglycerol cholinephosphotransferase and Organism(s) Homo sapiens and UniProt Accession Q9Y6K0

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EC Tree
IUBMB Comments
1-Alkyl-2-acylglycerol can act as acceptor; this activity was previously listed separately.
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This record set is specific for:
Homo sapiens
UNIPROT: Q9Y6K0
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Word Map
The taxonomic range for the selected organisms is: Homo sapiens
The expected taxonomic range for this enzyme is: Bacteria, Eukaryota
Synonyms
cholinephosphotransferase, choline phosphotransferase, cept1, paf-cpt, dtt-insensitive cholinephosphotransferase, diacylglycerol cholinephosphotransferase, phosphorylcholine glyceride transferase, 1,2-diacylglycerol cholinephosphotransferase, aapt1, phosphatidylcholine:diacylglycerol cholinephosphotransferase, more
SYNONYM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
CEPT1
choline phosphotransferase
-
1-alkyl-2-acetyl-m-glycerol:CDP-choline choline phosphotransferase
-
-
-
-
1-alkyl-2-acetyl-sn-glycerol cholinephosphotransferase
-
-
-
-
1-alkyl-2-acetylglycerol cholinephosphotransferase
-
-
-
-
AAPT
-
-
-
-
alkylacylglycerol choline phosphotransferase
-
-
-
-
alkylacylglycerol cholinephosphotransferase
-
-
-
-
aminoalcoholphosphotransferase
-
-
-
-
CDP-choline diglyceride phosphotransferase
-
-
-
-
CEPT
-
-
-
-
choline phosphotransferase
cholinephosphotransferase
cholinephosphotransferase, 1-alkyl-2-acetylglycerol
-
-
-
-
cholinephosphotransferase, diacylglycerol
-
-
-
-
cytidine diphosphocholine glyceride transferase
-
-
-
-
cytidine diphosphorylcholine diglyceride transferase
-
-
-
-
diacylglycerol choline phosphotransferase
-
-
-
-
DTT-insensitive CDP-choline: 1-alkyl-2-acetyl-sn-glycerol cholinephosphotransferase
-
-
DTT-insensitive cholinephosphotransferase
-
DTT: dithiothreitol
PAF-CPT
-
PAF: platelet activating factor, to be distinguished from PC-CPT, PC: phosphatidylcholine
phosphocholine diacylglyceroltransferase
-
-
-
-
phosphorylcholine-glyceride transferase
-
-
-
-
sn-1,2-diacylglycerol cholinephosphotransferase
-
-
-
-
additional information
cf. EC 2.7.8.1
REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
substituted phospho group transfer
-
-
-
-
SYSTEMATIC NAME
IUBMB Comments
CDP-choline:1,2-diacyl-sn-glycerol cholinephosphotransferase
1-Alkyl-2-acylglycerol can act as acceptor; this activity was previously listed separately.
CAS REGISTRY NUMBER
COMMENTARY hide
77237-98-0
formerly, EC 2.7.8.16
9026-13-5
-
SUBSTRATE
PRODUCT                       
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
CDP-choline + 1,2-diacyl-sn-glycerol
CMP + a phosphatidylcholine
show the reaction diagram
-
-
-
r
CDP-ethanolamine + 1,2-diacyl-sn-glycerol
CMP + a phosphatidylethanolamine
show the reaction diagram
-
-
-
r
CDP-choline + 1,2-diacyl-sn-glycerol
CMP + a phosphatidylcholine
show the reaction diagram
-
-
-
r
CDP-choline + 1,2-diacylglycerol
CMP + a phosphatidylcholine
show the reaction diagram
CDP-choline + 1-O-alkyl-2-acetyl-sn-glycerol
CMP + 1-O-alkyl-2-acetyl-sn-glycerol 3-phosphocholine
show the reaction diagram
CDP-choline + sn-1,2-diacylglycerol
?
show the reaction diagram
CDP-ethanolamine + 1,2-diacylglycerol
CMP + phosphatidylethanolamine
show the reaction diagram
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
CDP-choline + 1,2-diacyl-sn-glycerol
CMP + a phosphatidylcholine
show the reaction diagram
-
-
-
r
CDP-ethanolamine + 1,2-diacyl-sn-glycerol
CMP + a phosphatidylethanolamine
show the reaction diagram
-
-
-
r
CDP-choline + 1,2-diacyl-sn-glycerol
CMP + a phosphatidylcholine
show the reaction diagram
-
-
-
r
CDP-choline + 1-O-alkyl-2-acetyl-sn-glycerol
CMP + 1-O-alkyl-2-acetyl-sn-glycerol 3-phosphocholine
show the reaction diagram
-
platelet activating factor (PAF) de novo biosynthesis
-
-
?
CDP-choline + sn-1,2-diacylglycerol
?
show the reaction diagram
additional information
?
-
METALS and IONS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
Ca2+
-
0.1 mM (14.1% activity left) or 1 mM (1.41% activity left), estimated in presence of 20 mM Mg2+, inhibition partially reduced in presence of 0.5 mM EDTA: 33.3% or 3.70% activity left for 0.1 mM or 1 mM Ca2+, respectively (100% activity: 20 mM Mg2+, 0.5 mM EDTA, no Ca2+)
chelerythrine
-
inhibitor of protein kinase C, IC50 0.04 mM
EDTA
-
10 mM, in presence of 20 mM Mg2+
INFalpha
-
250 inhibitory units/microl, 51% inhibition of enzyme activity in microsomal fraction of mesangial cells
-
Mg2+
inhibitory above 10 mM, activation below
Mn2+
-
inhibitory above 10 mM, activation below
NaF
-
sodium fluoride, 50 mM, 40% reduction in activity
polar lipids from olive oil
-
5.2 ng/microl, 33% inhibition of enzyme activity in microsomal fraction of mesangial cells
-
polar lipids from olive pomace
-
1.8 ng/microl, 48% inhibition of enzyme activity in microsomal fraction of mesangial cells
-
polar lipids from sea bass
-
59 ng/microl, 45% inhibition of enzyme activity in microsomal fraction of mesangial cells
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polar lipids from sea bream
-
123 ng/microl, 17% inhibition of enzyme activity in microsomal fraction of mesangial cells
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R59949
-
inhibitor of protein kinase C, IC50 0.04 mM
resveratrol
-
100 microM, 39% inhibition of enzyme activity in microsomal fraction of mesangial cells
rupatadine
-
20 ng/microl, 60% inhibition of enzyme activity in microsomal fraction of mesangial cells
salicylic acid
-
250 ng/microl, 38% inhibition of enzyme activity in microsomal fraction of mesangial cells
simvastatine
-
40 ng/microl, 92% inhibition of enzyme activity in microsomal fraction of mesangial cells
tinzaparin
-
0.25 inhibitory units/microl, 30% inhibition of enzyme activity in microsomal fraction of mesangial cells
-
additional information
-
ACTIVATING COMPOUND
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
bovine serum albumin
-
specific activity increases in presence of 0.5-2 mg/ml bovine serum albumin, microsomal fraction of human mesangial cells
-
dithiothreitol
EDTA
-
maximum activation at 0.5 mM, in presence of 20 mM Mg2+
phorbol 12-myristate 13-acetate
-
activates
KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
0.0593
1-O-alkyl-2-acetyl-sn-glycerol
-
optimum reaction conditions, in presence of 100 microM CDP-choline
0.0166 - 0.037
CDP-choline
0.098 - 0.101
CDP-ethanolamine
IC50 VALUE [mM]
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
0.04
chelerythrine
Homo sapiens
-
inhibitor of protein kinase C, IC50 0.04 mM
0.04
R59949
Homo sapiens
-
inhibitor of protein kinase C, IC50 0.04 mM
SPECIFIC ACTIVITY [µmol/min/mg]
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
0.0000003
-
0.01 mM Mg2+, microsomal fraction of human mesangial cells
0.0000012
-
1 mM Mg2+, microsomal fraction of human mesangial cells
0.0000036
-
10 mM Mg2+, microsomal fraction of human mesangial cells
0.00002
-
mitochondrial fraction of human mesangial cells
0.000067
-
20 mM Mg2+, microsomal fraction of human mesangial cells
0.0001
-
homogenate of human mesangial cells
0.00025
-
20 mM Mg2+, 0.5 mM EDTA, microsomal fraction of human mesangial cells
0.00036
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microsomal fraction of human mesangial cells, maximum activity in presence of 1 mg/ml bovine serum albumin, 15 mM dithiothreitol, 20 mM Mg2+, 0.5 mM EDTA
additional information
pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
8
-
100 mM Tris-HCl, bell-shaped pH activity profile
TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
37
-
microsomal fraction of human mesangial cells (HMC), bell-shaped temperature activity profile
ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
SOURCE TISSUE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
SOURCE
CEPT1 is elevated in diseased lower extremity arterial intima of individuals with peripheral arterial disease and diabetes
Manually annotated by BRENDA team
CEPT1 is elevated in carotid plaque of patients with diabetes
Manually annotated by BRENDA team
CEPT1 is elevated in diseased lower extremity arterial intima of individuals with peripheral arterial disease and diabetes
Manually annotated by BRENDA team
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normal: MCF-12A and MCF-12F and cancerous: MCF-7, BT-549 and 11-9-1-4
Manually annotated by BRENDA team
-
HMC, immortilized by transfection with T-antigen of SV40 and Hras oncogene
Manually annotated by BRENDA team
LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY hide
GeneOntology No.
LITERATURE
SOURCE
an integral membrane protein
Manually annotated by BRENDA team
an integral membrane protein
Manually annotated by BRENDA team
co-purifies with crude mitochondria during subcellular fractionation of organelles
-
Manually annotated by BRENDA team
additional information
GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
malfunction
reduction of phosphatidylcholine, e.g. by bacterial infection, results in apoptosis
metabolism
the CDP-choline and CDP-ethanolamine pathways are separate routes of phospholipid biosynthesis in mammalian cells, although the CEPT is probably a participant in both pathways. The CPT activity responsible for the synthesis of platelet-activating factor (PAF) is different from those responsible for PtdCho synthesis on the basis of the enzyme's sensitivity to dithiothreitol. Molecular regulation of the CDP-choline pathway, overview. The CDP-choline pathway of phosphatidylcholine synthesis is essential in proliferating cells. The phosphatidylcholine pool is dynamic and the amount of PtdCho represents a balance between synthesis and degradation. Physiological role of the CDP-choline pathway, overview
physiological function
CEPT1 is important for phosphatidylethanolamine formation from fatty acids such as 32:2, 32:1, 34:2, and 34:1, i.e. reaction of EC 2.7.8.1. Brefeldin A treatment does not significantly affect the levels of the different phosphatidylethanolamine species. CEPT1 greatly prefers diacylglycerols 16:0-18:1 to other acceptors
malfunction
inhibition of the CPT activity reduces phospholipid synthesis and results in accumulation of CPT substrates. Reduction of phosphatidylcholine, e.g. by bacterial infection, results in apoptosis
metabolism
CPT catalyzes the final step in the synthesis of phosphatidylcholine via the Kennedy pathway by the transfer of phosphocholine from CDP-choline to 1,2-diacyl-sn-glycerol. The CDP-choline and CDP-ethanolamine pathways are separate routes of phospholipid biosynthesis in mammalian cells, although the CEPT is probably a participant in both pathways. Molecular regulation of the CDP-choline pathway, DNA synthesis and phosphatidylcholine synthesis are not linked, overview. The CDP-choline pathway of phosphatidylcholine synthesis is essential in proliferating cells. The phosphatidylcholine pool is dynamic and the amount of PtdCho represents a balance between synthesis and degradation. phosphatidylcholine and other phospholipids are synthesized in the G2/M phase, rather than S phase. Physiological role of the CDP-choline pathway, overview
UNIPROT
ENTRY NAME
ORGANISM
NO. OF AA
NO. OF TRANSM. HELICES
MOLECULAR WEIGHT[Da]
SOURCE
SEQUENCE
LOCALIZATION PREDICTION?
CEPT1_HUMAN
416
8
46554
Swiss-Prot
Mitochondrion (Reliability: 5)
MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
39000
x * 39000, hCPT1, SDS-PAGE and deduced from gene sequence
46500
-
x * 46500, hCEPT1, SDS-PAGE and deduced from gene sequence, seven membrane-spanning helices
SUBUNIT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
additional information
-
integral membrane-bound protein, overview on structure and properties
TEMPERATURE STABILITY
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
50
-
20 min heating results in loss of 80% of activity, microsomal fraction of human mesangial cells (HMC)
60
-
20 min heating results in total loss of activity, microsomal fraction of human mesangial cells (HMC)
STORAGE STABILITY
ORGANISM
UNIPROT
LITERATURE
-20°C, microsomal fraction of human mesangial cells (HMC), 30 days
-
PURIFICATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
overview: purification
-
CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
expressed in NIH-3T3 cells
expressed in the murine CH12 B-cell lymphoma cell line
-
overview
-
EXPRESSION
ORGANISM
UNIPROT
LITERATURE
expression of the gene encoding CPT, but not CEPT, EC 2.7.8.1, increases during lipopolysaccahride-induced endoplasmic reticulum biogenesis in B-lymphocytes
expression of the gene encoding CPT, but not CEPT, EC 2.7.8.1, increases during lipopolysaccahride-induced endoplasmic reticulum biogenesis in B-lymphocytes
APPLICATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
analysis
since CPT expression is associated with elaboration of new endoplasmic reticulum membrane, it may be useful as a marker protein for endoplasmic reticulum expansion
REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Lee, T.C.; Snyder, F.
1-Alkyl-2-acetyl-sn-glycerol cholinephosphotransferase
Methods Enzymol.
209
279-283
1992
Gallus gallus, Oryctolagus cuniculus, Homo sapiens, Rattus norvegicus
Manually annotated by BRENDA team
Heller, R.; Bussolino, F.; Ghigo, D.; Garbarino, G.; Pescarmona, G.; Till, U.; Bosia, A.
Stimulation of platelet-activating factor synthesis in human endothelial cells by activation of the de novo pathway. Phorbol 12-myristate 13-acetate activates 1-alkyl-2-lyso-sn-glycero-3-phosphate:acetyl-CoA acetyltransferase and dithiothreitol-insensitive 1-alkyl-2-acetyl-sn-glycerol:CDP-choline cholinephosphotransferase
J. Biol. Chem.
266
21358-21361
1991
Homo sapiens
Manually annotated by BRENDA team
Henneberry, A.L.; McMaster, C.R.
Cloning and expression of a human choline/ethanolaminephosphotransferase: synthesis of phosphatidylcholine and phosphatidylethanolamine
Biochem. J.
339
291-298
1999
Homo sapiens
-
Manually annotated by BRENDA team
McMaster, C.R.; Bell, R.M.
CDP-choline:1,2-diacylglycerol cholinephosphotransferase
Biochim. Biophys. Acta
1348
100-110
1997
Saccharomyces cerevisiae, Glycine max, Homo sapiens, Mesocricetus auratus, Rattus norvegicus
Manually annotated by BRENDA team
Wright, M.M.; McMaster, C.R.
PC and PE synthesis: mixed micellar analysis of the cholinephosphotransferase and ethanolaminephosphotransferase activities of human choline/ethanolamine phosphotransferase 1 (CEPT1)
Lipids
37
663-672
2002
Homo sapiens
Manually annotated by BRENDA team
Henneberry, A.L.; Wistow, G.; McMaster, C.R.
Cloning, genomic organization, and characterization of a human cholinephosphotransferase
J. Biol. Chem.
275
29808-29815
2000
Homo sapiens (Q8WUD6), Homo sapiens
Manually annotated by BRENDA team
Roy, S.S.; Mukherjee, S.; Mukhopadhyay, S.; Das, S.K.
Differential effect of cadmium on cholinephosphotransferase activity in normal and cancerous human mammary epithelial cell lines
Mol. Cancer Ther.
3
199-204
2004
Homo sapiens
Manually annotated by BRENDA team
Sriburi, R.; Bommiasamy, H.; Buldak, G.L.; Robbins, G.R.; Frank, M.; Jackowski, S.; Brewer, J.W.
Coordinate regulation of phospholipid biosynthesis and secretory pathway gene expression in XBP-1(S)-induced endoplasmic reticulum biogenesis
J. Biol. Chem.
282
7024-7034
2007
Homo sapiens (Q8WUD6)
Manually annotated by BRENDA team
Fagone, P.; Sriburi, R.; Ward-Chapman, C.; Frank, M.; Wang, J.; Gunter, C.; Brewer, J.W.; Jackowski, S.
Phospholipid biosynthesis program underlying membrane expansion during B-lymphocyte differentiation
J. Biol. Chem.
282
7591-7605
2007
Homo sapiens
Manually annotated by BRENDA team
Tsoupras, A.B.; Fragopoulou, E.; Nomikos, T.; Iatrou, C.; Antonopoulou, S.; Demopoulos, C.A.
Characterization of the de novo biosynthetic enzyme of platelet activating factor, DDT-insensitive cholinephosphotransferase, of human mesangial cells
Mediators Inflamm.
2007
27683
2007
Homo sapiens
Manually annotated by BRENDA team
Fagone, P.; Jackowski, S.
Phosphatidylcholine and the CDP-choline cycle
Biochim. Biophys. Acta
1831
523-532
2013
Glycine max (I1KH05), Saccharomyces cerevisiae (P17898), Saccharomyces cerevisiae, Homo sapiens (Q8WUD6), Homo sapiens (Q9Y6K0)
Manually annotated by BRENDA team
Zayed, M.A.; Jin, X.; Yang, C.; Belaygorod, L.; Engel, C.; Desai, K.; Harroun, N.; Saffaf, O.; Patterson, B.W.; Hsu, F.F.; Semenkovich, C.F.
CEPT1-mediated phospholipogenesis regulates endothelial cell function and ischemia-induced angiogenesis through PPARalpha
Diabetes
70
549-561
2020
Homo sapiens (Q9Y6K0), Homo sapiens, Mus musculus (Q8BGS7)
Manually annotated by BRENDA team
Horibata, Y.; Elpeleg, O.; Eran, A.; Hirabayashi, Y.; Savitzki, D.; Tal, G.; Mandel, H.; Sugimoto, H.
EPT1 (selenoprotein I) is critical for the neural development and maintenance of plasmalogen in humans
J. Lipid Res.
59
1015-1026
2018
Homo sapiens (Q9Y6K0)
Manually annotated by BRENDA team