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Information on EC 2.4.1.198 - phosphatidylinositol N-acetylglucosaminyltransferase

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IUBMB Comments
Involved in the first step of glycosylphosphatidylinositol (GPI) anchor formation in all eukaryotes. In mammalian cells, the enzyme is composed of at least five subunits (PIG-A, PIG-H, PIG-C, GPI1 and PIG-P). PIG-A subunit is the catalytic subunit. In some species, the long-chain acyl groups of the phosphatidyl group are partly replaced by long-chain alkyl or alk-1-enyl groups.
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This record set is specific for:
UNIPROT: Q3MUY2
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Word Map
The expected taxonomic range for this enzyme is: Eukaryota, Bacteria, Archaea
Synonyms
pig-a, gpi-gnt, dscr5, gpi-n-acetylglucosaminyltransferase, gpi19, gpi-glcnac transferase, phosphatidylinositol n-acetylglucosaminyltransferase, gpi15, phosphatidylinositol n-acetylglucosaminyltransferase subunit a, afpig-a, more
SYNONYM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
GPI-N-acetylglucosaminyltransferase
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acetyl-D-glucosaminyltransferase, uridine diphosphoacetylglucosamine alpha1,6-
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UDP-N-acetyl-D-glucosamine:phosphatidylinositol N-acetyl-D-glucosaminyltransferase
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uridine diphosphoacetylglucosamine alpha1,6-acetyl-D-glucosaminyltransferase
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REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
hexosyl group transfer
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SYSTEMATIC NAME
IUBMB Comments
UDP-N-acetyl-D-glucosamine:1-phosphatidyl-1D-myo-inositol 6-(N-acetyl-alpha-D-glucosaminyl)transferase
Involved in the first step of glycosylphosphatidylinositol (GPI) anchor formation in all eukaryotes. In mammalian cells, the enzyme is composed of at least five subunits (PIG-A, PIG-H, PIG-C, GPI1 and PIG-P). PIG-A subunit is the catalytic subunit. In some species, the long-chain acyl groups of the phosphatidyl group are partly replaced by long-chain alkyl or alk-1-enyl groups.
CAS REGISTRY NUMBER
COMMENTARY hide
144388-35-2
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SPECIFIC ACTIVITY [µmol/min/mg]
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
additional information
ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
cDNA that encode a 71-amino acid protein, which is termed PIG-Y (for phosphatidylinositlglycan-class Y). Mouse and rice homologues of PIG-Y, exhibit 79% and 25% amino acid identity with human PIG-Y, respectively. The hydropathy profile of Saccharomyces cerevisiae´s Eri1p is quite similar to PIG-Y and the amino acid identity is 22%. N-terminus and C-terminus face the cytoplasmic side.; from the human T lymphoma KT-3 cDNA library
Swissprot
Manually annotated by BRENDA team
UNIPROT
ENTRY NAME
ORGANISM
NO. OF AA
NO. OF TRANSM. HELICES
MOLECULAR WEIGHT[Da]
SOURCE
SEQUENCE
LOCALIZATION PREDICTION?
PIGY_HUMAN
71
0
8058
Swiss-Prot
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SUBUNIT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
additional information
PURIFICATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
affinity purified
CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
expressed in Daudi cells. Daudi cells have no PIG-Y transcritpt. PIG-Y cDNA restores the surface expression of CD59, DAF and CD48, but an empty vector does not. glycosylphosphatidylinositol-N-acetylglucosaminyltransferase activity is also restored
expressed in HeLa cells
in chinese hamster ovary cells
REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Murakami, Y.; Siripanyaphinyo, U.; Hong, Y.; Tashima, Y.; Maeda, Y.; Kinoshita, T.
The initial enzyme for glycosylphosphatidylinositol biosynthesis requires PIG-Y, a seventh component
Mol. Biol. Cell
16
5236-5246
2005
Homo sapiens (Q3MUY2), Homo sapiens
Manually annotated by BRENDA team