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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 ...
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 ...
The conversion of PA into diacylglycerol (DAG) by LPPs is the commitment step for the production of phosphatidylcholine (PC), phosphatidylethanolamine (PE) and phosphatidylserine (PS). In addition, DAG is also converted into CDP-DAG, which is a precursor for phosphatidylglycerol (PG), phosphatidylinositol (PI) and phosphoinositides (PIP, PIP 2 ...
The presence of enzymes involved in phospholipid biosynthesis in MAM fraction is known since the 1970s, and the synthesis of some phospholipid is completed in both organelles. For instance, the biosynthetic pathway of phosphatidylcholine involves different steps some on the ER and some on the inner mitochondrial membrane .
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 ...