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The activities of Kir6 can be enhanced by PIP2, which is a signaling lipid present in the inner leaflets of the plasma membrane.
Moreover, the outer and inner leaflets of the bacterial cytoplasmic membrane are also negatively charged.
In this assay, annexin-V would detect the translocation of phosphatidylserine from the inner leaflets to the outer leaflets of the plasma membrane, which is a key feature of apoptotic cells, whereas PI would detect necrotic cells with permeabilized plasma membrane.
In this article, we report spectroscopic, calorimetric and biochemical data on the penetratin interaction with three different phospholipids: phosphatidylcholine (PC) and phosphatidylethanolamine (PE) to mimic respectively the outer and the inner leaflets of the eukaryotic plasma membrane and phosphatidylglycerol (PG) to mimic the bacterial membrane.
In this study we characterized the membrane aggregation capacity of penetratin using LUVs of three different compositions: PC and PE main phospholipids of, respectively, the outer and inner leaflets of eukaryotic cells and PG, a phospholipid highly represented in prokaryotes' outer leaflet.
Phosphatidylethanolamine (PE) is a zwitterionic PL, mainly located in the inner leaflets of biological membranes.
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Aun+ provides the greatest amount of information from the inner leaflet.
And you can see an outer leaflet here and a very distorted looking part of an inner leaflet here.
It is a remarkable asymmetric bilayer with a glycolipid surface-exposed leaflet and a glycerophospholipid inner leaflet.
A flippase (out-to-in translocation) normally confines PS to the inner leaflet of the plasma membrane22.
Myristate exposure probably facilitates its insertion into the inner leaflet of the plasma membrane, thereby stabilizing the Gag membrane association.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com