Phosphatidylinositol-glycan-specific phospholipase D is an enzyme that in humans is encoded by the GPLD1 gene. [5] [6]
Many proteins are tethered to the extracellular face of eukaryotic plasma membranes by a glycosylphosphatidylinositol (GPI) anchor. The GPI-anchor is a glycolipid found on many blood cells. The protein encoded by the GPLD1 gene is a GPI degrading enzyme that hydrolyzes the inositol phosphate linkage in proteins anchored by phosphatidylinositol glycans, thereby releasing the attached protein from the plasma membrane. [6]
Plasma concentrations of Gpld1 in mice were found to increase after exercise and to correlate with improved cognitive function, and concentrations of GPLD1 in blood were increased in active elderly humans. [7] [8]
GPLD1 has been shown to interact with Apolipoprotein A1 [9] and APOA4. [9]
Lipid-anchored proteins are proteins located on the surface of the cell membrane that are covalently attached to lipids embedded within the cell membrane. These proteins insert and assume a place in the bilayer structure of the membrane alongside the similar fatty acid tails. The lipid-anchored protein can be located on either side of the cell membrane. Thus, the lipid serves to anchor the protein to the cell membrane. They are a type of proteolipids.
Glycosylphosphatidylinositol, or glycophosphatidylinositol, or GPI in short, is a phosphoglyceride that can be attached to the C-terminus of a protein during posttranslational modification. The resulting GPI-anchored proteins play key roles in a wide variety of biological processes. GPI is composed of a phosphatidylinositol group linked through a carbohydrate-containing linker and via an ethanolamine phosphate (EtNP) bridge to the C-terminal amino acid of a mature protein. The two fatty acids within the hydrophobic phosphatidyl-inositol group anchor the protein to the cell membrane.
Glycosylphosphatidylinositol phospholipase D (EC 3.1.4.50, GPI-PLD, glycoprotein phospholipase D, phosphatidylinositol phospholipase D, phosphatidylinositol-specific phospholipase D) is an enzyme with systematic name glycoprotein-phosphatidylinositol phosphatidohydrolase. This enzyme catalyses the following chemical reaction
1-Phosphatidylinositol-4,5-bisphosphate phosphodiesterase gamma-2 is an enzyme that in humans is encoded by the PLCG2 gene.
CD48 antigen also known as B-lymphocyte activation marker (BLAST-1) or signaling lymphocytic activation molecule 2 (SLAMF2) is a protein that in humans is encoded by the CD48 gene.
1-Phosphatidylinositol-4,5-bisphosphate phosphodiesterase beta-3 is an enzyme that in humans is encoded by the PLCB3 gene.
Phosphatidylinositol N-acetylglucosaminyltransferase subunit A is the catalytic subunit of the phosphatidylinositol N-acetylglucosaminyltransferase enzyme, which in humans is encoded by the PIGA gene.
GPI transamidase component PIG-T is an enzyme that in humans is encoded by the PIGT gene.
GPI-anchor transamidase is an enzyme that in humans is encoded by the PIGK gene.
Glycosylphosphatidylinositol anchor attachment 1 protein is a protein that in humans is encoded by the GPAA1 gene.
Phosphatidylinositol N-acetylglucosaminyltransferase subunit Q is an enzyme that in humans is encoded by the PIGQ gene.
Phosphatidylinositol N-acetylglucosaminyltransferase subunit C is an enzyme that in humans is encoded by the PIGC gene.
Phosphatidylinositol-glycan biosynthesis class F protein is a protein that in humans is encoded by the PIGF gene.
GPI transamidase component PIG-S is an enzyme that in humans is encoded by the PIGS gene. This gene encodes a protein that is involved in GPI-anchor biosynthesis.
Phosphatidylinositol glycan anchor biosynthesis class U protein is a protein that in humans is encoded by the PIGU gene.
GPI mannosyltransferase 3 is an enzyme that in humans is encoded by the PIGB gene.
Alkaline phosphatase, placental type also known as placental alkaline phosphatase (PLAP) is an allosteric enzyme that in humans is encoded by the ALPP gene.
Subunit P of phosphatidylinositol N-acetylglucosaminyltransferase is an enzyme that in humans is encoded by the PIGP gene.
Phosphatidylinositol N-acetylglucosaminyltransferase subunit H is an enzyme that in humans is encoded by the PIGH gene. The PIGH gene is located on the reverse strand of chromosome 14 in humans, and is neighbored by TMEM229B.
Phosphatidylinositol glycan anchor biosynthesis, class N is a protein that in humans is encoded by the PIGN gene.