Article ; Online: Phosphatidylglycerol Acts as a Switch for Cholesterol-Dependent Membrane Binding of ApoE Signal Peptide.
Langmuir : the ACS journal of surfaces and colloids
2024 Volume 40, Issue 15, Page(s) 8126–8132
Abstract: The apolipoprotein E (ApoE) signal peptide is a short stretch of N-terminal amino acids that direct the ApoE protein to the endoplasmic reticulum after synthesis. Previous studies have shown that this peptide can bind to lipid membranes in a cholesterol- ... ...
Abstract | The apolipoprotein E (ApoE) signal peptide is a short stretch of N-terminal amino acids that direct the ApoE protein to the endoplasmic reticulum after synthesis. Previous studies have shown that this peptide can bind to lipid membranes in a cholesterol-dependent manner; however, the mechanism of this interaction is yet to be clarified. In this study, we aimed to investigate how the composition of neighboring lipids affects the membrane-binding of the ApoE signal peptide. We found that a negatively charged lipid, such as phosphatidylglycerol, can act as a switch that reduces the binding efficiency of the peptide to cholesterol-rich membranes. Interestingly, phosphatidylethanolamine does not activate the cholesterol-dependent binding of the ApoE signal peptide yet acts synergistically to enhance the cholesterol sensitivity in phosphatidylglycerol-containing membranes. To the best of our knowledge, this is the first report of modulation of the affinity of a peptide for a membrane by a neighboring lipid rather than by the lipid-binding domain of the peptide. Our findings revealed a novel role of lipid diversity in modulating the membrane binding of the ApoE signal peptide and its potential implications in the unidirectional trafficking of a newly synthesized protein from the ribosomes to the endoplasmic reticulum. |
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MeSH term(s) | Protein Sorting Signals ; Phosphatidylglycerols ; Apolipoproteins E/chemistry ; Apolipoproteins E/metabolism ; Cholesterol/chemistry ; Peptides |
Chemical Substances | Protein Sorting Signals ; Phosphatidylglycerols ; Apolipoproteins E ; Cholesterol (97C5T2UQ7J) ; Peptides |
Language | English |
Publishing date | 2024-04-03 |
Publishing country | United States |
Document type | Journal Article |
ZDB-ID | 2005937-1 |
ISSN | 1520-5827 ; 0743-7463 |
ISSN (online) | 1520-5827 |
ISSN | 0743-7463 |
DOI | 10.1021/acs.langmuir.4c00178 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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