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Phosphatidylserine (PS) is the major acidic phospholipid class that accounts for 13–15% of the phospholipids in the human cerebral cortex. [7] In the plasma membrane, PS is localized exclusively in the cytoplasmic leaflet where it forms part of protein docking sites necessary for the activation of several key signaling pathways.
Phosphatidylserine decarboxylase is the enzyme that is used to decarboxylate phosphatidylserine in the first pathway. The phosphatidylserine decarboxylation pathway is the main source of synthesis for phosphatidylethanolamine in the membranes of the mitochondria. Phosphatidylethanolamine produced in the mitochondrial membrane is also ...
Phospholipid synthesis occurs in the cytosolic side of ER membrane [15] that is studded with proteins that act in synthesis (GPAT and LPAAT acyl transferases, phosphatase and choline phosphotransferase) and allocation (flippase and floppase). Eventually a vesicle will bud off from the ER containing phospholipids destined for the cytoplasmic ...
Another study by Lahiri et al. has demonstrated that loss of contacts between the ER and mitochondria results in severe reduction in mitochondrial biosynthesis of phosphatidylethanolamine (PE) due to reduction in transport of phosphatidylserine (PS), which is the precursor for PE synthesis.
19210 Ensembl ENSG00000156471 ENSMUSG00000021518 UniProt P48651 Q99LH2 RefSeq (mRNA) NM_014754 NM_001290225 NM_008959 RefSeq (protein) NP_001277154 NP_055569 NP_032985 Location (UCSC) Chr 8: 96.26 – 96.34 Mb Chr 13: 67.08 – 67.15 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Phosphatidylserine synthase 1 is a protein that in humans is encoded by the PTDSS1 gene. Function The ...
Phosphatidylserine is translocated to the exoplasmic leaflet by the activation of scramblases, leading to pro-coagulant properties and providing a phagocytic signal to the macrophages that engulf and clear the apoptotic cells. The involvement of other associated proteins aiding scrambling activity cannot be ruled out.
L-serine-phosphatidylethanolamine phosphatidyltransferase (EC 2.7.8.29, phosphatidylserine synthase 2, serine-exchange enzyme II, PTDSS2 (gene)) is an enzyme with systematic name L-1-phosphatidylethanolamine:L-serine phosphatidyltransferase. [1] [2] This enzyme catalyses the following chemical reaction
A classic example of this is phosphatidylserine-triggered phagocytosis. Normally, phosphatidylserine is asymmetrically distributed in the cell membrane and is present only on the interior side. During programmed cell death a protein called a scramblase equilibrates this distribution, displaying phosphatidylserine on the extracellular bilayer ...