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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.
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
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 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 ...
Besides de novo synthesis, PA can be formed in three ways: By phospholipase D (PLD), via the hydrolysis of the P-O bond of phosphatidylcholine (PC) to produce PA and choline. [4] By the phosphorylation of diacylglycerol (DAG) by DAG kinase (DAGK). By the acylation of lysophosphatidic acid by lysoPA-acyltransferase (LPAAT); this is the most ...
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.
The enzyme phosphatidylserine decarboxylase (EC 4.1.1.65) catalyzes the chemical reaction phosphatidyl-L-serine ⇌ {\displaystyle \rightleftharpoons } phosphatidylethanolamine + CO 2 This enzyme belongs to the family of lyases , specifically the carboxy-lyases, which cleave carbon-carbon bonds.
This encoded enzyme is responsible for the third and last step in L-serine formation. It catalyzes magnesium-dependent hydrolysis of L-phosphoserine and is also involved in an exchange reaction between L-serine and L-phosphoserine. Deficiency of this protein is thought to be linked to Williams syndrome. [7]