C2 domain membrane penetration by group IVA cytosolic phospholipase A2 induces membrane curvature changes[S]
Group IVA cytosolic phospholipase A2 (cPLA2α) is an 85 kDa enzyme that regulates the release of arachidonic acid (AA) from the sn-2 position of membrane phospholipids. It is well established that cPLA2α binds zwitterionic lipids such as phosphatidylcholine in a Ca2+-dependent manner through its N-te...
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doaj-fb8ffea28651427dbf0e008fcac5e9b92021-04-28T06:05:12ZengElsevierJournal of Lipid Research0022-22752012-12-01531226562666C2 domain membrane penetration by group IVA cytosolic phospholipase A2 induces membrane curvature changes[S]Katherine E. Ward0James P. Ropa1Emmanuel Adu-Gyamfi2Robert V. Stahelin3Department of Chemistry and Biochemistry, University of Notre Dame, South Bend, IN, 46556Department of Chemistry and Biochemistry, University of Notre Dame, South Bend, IN, 46556Department of Chemistry and Biochemistry, University of Notre Dame, South Bend, IN, 46556; the Eck Institute for Global Health, University of Notre Dame, South Bend, IN, 46556; andTo whom correspondence should be addressed. e-mail: rstaheli@iupui.edu.; Department of Chemistry and Biochemistry, University of Notre Dame, South Bend, IN, 46556; the Eck Institute for Global Health, University of Notre Dame, South Bend, IN, 46556; and; Department of Biochemistry and Molecular Biology, Indiana University School of Medicine-South Bend, South Bend, IN 46617; To whom correspondence should be addressed. e-mail: rstaheli@iupui.edu.Group IVA cytosolic phospholipase A2 (cPLA2α) is an 85 kDa enzyme that regulates the release of arachidonic acid (AA) from the sn-2 position of membrane phospholipids. It is well established that cPLA2α binds zwitterionic lipids such as phosphatidylcholine in a Ca2+-dependent manner through its N-terminal C2 domain, which regulates its translocation to cellular membranes. In addition to its role in AA synthesis, it has been shown that cPLA2α promotes tubulation and vesiculation of the Golgi and regulates trafficking of endosomes. Additionally, the isolated C2 domain of cPLA2α is able to reconstitute Fc receptor-mediated phagocytosis, suggesting that C2 domain membrane binding is sufficient for phagosome formation. These reported activities of cPLA2α and its C2 domain require changes in membrane structure, but the ability of the C2 domain to promote changes in membrane shape has not been reported. Here we demonstrate that the C2 domain of cPLA2α is able to induce membrane curvature changes to lipid vesicles, giant unilamellar vesicles, and membrane sheets. Biophysical assays combined with mutagenesis of C2 domain residues involved in membrane penetration demonstrate that membrane insertion by the C2 domain is required for membrane deformation, suggesting that C2 domain-induced membrane structural changes may be an important step in signaling pathways mediated by cPLA2α.http://www.sciencedirect.com/science/article/pii/S0022227520418000calciumcytosolic phospholipase A2αlipid binding |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Katherine E. Ward James P. Ropa Emmanuel Adu-Gyamfi Robert V. Stahelin |
spellingShingle |
Katherine E. Ward James P. Ropa Emmanuel Adu-Gyamfi Robert V. Stahelin C2 domain membrane penetration by group IVA cytosolic phospholipase A2 induces membrane curvature changes[S] Journal of Lipid Research calcium cytosolic phospholipase A2α lipid binding |
author_facet |
Katherine E. Ward James P. Ropa Emmanuel Adu-Gyamfi Robert V. Stahelin |
author_sort |
Katherine E. Ward |
title |
C2 domain membrane penetration by group IVA cytosolic phospholipase A2 induces membrane curvature changes[S] |
title_short |
C2 domain membrane penetration by group IVA cytosolic phospholipase A2 induces membrane curvature changes[S] |
title_full |
C2 domain membrane penetration by group IVA cytosolic phospholipase A2 induces membrane curvature changes[S] |
title_fullStr |
C2 domain membrane penetration by group IVA cytosolic phospholipase A2 induces membrane curvature changes[S] |
title_full_unstemmed |
C2 domain membrane penetration by group IVA cytosolic phospholipase A2 induces membrane curvature changes[S] |
title_sort |
c2 domain membrane penetration by group iva cytosolic phospholipase a2 induces membrane curvature changes[s] |
publisher |
Elsevier |
series |
Journal of Lipid Research |
issn |
0022-2275 |
publishDate |
2012-12-01 |
description |
Group IVA cytosolic phospholipase A2 (cPLA2α) is an 85 kDa enzyme that regulates the release of arachidonic acid (AA) from the sn-2 position of membrane phospholipids. It is well established that cPLA2α binds zwitterionic lipids such as phosphatidylcholine in a Ca2+-dependent manner through its N-terminal C2 domain, which regulates its translocation to cellular membranes. In addition to its role in AA synthesis, it has been shown that cPLA2α promotes tubulation and vesiculation of the Golgi and regulates trafficking of endosomes. Additionally, the isolated C2 domain of cPLA2α is able to reconstitute Fc receptor-mediated phagocytosis, suggesting that C2 domain membrane binding is sufficient for phagosome formation. These reported activities of cPLA2α and its C2 domain require changes in membrane structure, but the ability of the C2 domain to promote changes in membrane shape has not been reported. Here we demonstrate that the C2 domain of cPLA2α is able to induce membrane curvature changes to lipid vesicles, giant unilamellar vesicles, and membrane sheets. Biophysical assays combined with mutagenesis of C2 domain residues involved in membrane penetration demonstrate that membrane insertion by the C2 domain is required for membrane deformation, suggesting that C2 domain-induced membrane structural changes may be an important step in signaling pathways mediated by cPLA2α. |
topic |
calcium cytosolic phospholipase A2α lipid binding |
url |
http://www.sciencedirect.com/science/article/pii/S0022227520418000 |
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