Journal
SCIENCE
Volume 337, Issue 6095, Pages 727-730Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1222483
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Funding
- Wellcome Trust
- Isaac Newton Trust
- Alexander von Humboldt Foundation
- UK Biotechnology and Biological Sciences Research Council
- Dame Rosemary Murray Scholarship
- Intramural Research Program of the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), NIH
- BBSRC [BBS/E/B/000C0415] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BBS/E/B/000C0415] Funding Source: researchfish
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The quantitatively minor phospholipid phosphatidylinositol (4,5)-bisphosphate [PI(4,5)P-2] fulfills many cellular functions in the plasma membrane (PM), whereas its synthetic precursor, phosphatidylinositol 4-phosphate (PI4P), has no assigned PM roles apart from PI(4,5)P-2 synthesis. We used a combination of pharmacological and chemical genetic approaches to probe the function of PM PI4P, most of which was not required for the synthesis or functions of PI(4,5)P-2. However, depletion of both lipids was required to prevent PM targeting of proteins that interact with acidic lipids or activation of the transient receptor potential vanilloid 1 cation channel. Therefore, PI4P contributes to the pool of polyanionic lipids that define plasma membrane identity and to some functions previously attributed specifically to PI(4,5)P-2, which may be fulfilled by a more general polyanionic lipid requirement.
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