Unsaturation, curvature and charge: effects of membrane parameters on PIK3C3/VPS34-containing complexes
- 15 January 2021
- journal article
- research article
- Published by Taylor & Francis Ltd in Autophagy
- Vol. 17 (3), 823-825
- https://doi.org/10.1080/15548627.2021.1872190
Abstract
Phosphatidylinositol-3-phosphate (PtdIns3P) is essential for generating autophagosomes and regulating endocytic trafficking. Recently, we have shown that the activities of human PIK3C3/VPS34-containing complexes I and II, which synthesize PtdIns3P, are greatly affected by three membrane physicochemical parameters: lipid unsaturation, membrane curvature, and negative charge. Both complexes are more active on membranes composed of unsaturated lipids than saturated lipids, and high membrane curvature can compensate for the negative effect of high lipid saturation. Negatively charged phosphatidylserine (PS) activates the complexes, as well as PIK3C3/VPS34 alone. The kinase activity of complex I depends critically on the ATG14 BATS domain, whereas complex II relies on the BECN1 BARA domain. Our findings highlight the importance of the membrane character as sensed by the unique membrane binding motifs/domain of the complexes for regulating PIK3C3/VPS34 activity.Keywords
Funding Information
- Medical Research Council (MC_U105184308)
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