Abstract
The cationic amphipathic designer peptide LAH4 exhibits potent antimicrobial, nucleic acid transfection and cell penetration activities. Closely related derivatives have been developed to enhance viral transduction for gene therapeutic assays. LAH4 contains four histidines and, consequently, its overall charge and membrane topology in lipid bilayers are strongly pH dependent. In order to better understand the differential interactions of this amphipathic peptide with negatively-charged membranes its interactions, topologies, and penetration depth were investigated in the presence of lipid bilayers as a function of pH, buffer, phospholipid head group, and fatty acyl chain composition using a combination of oriented synchrotron radiation circular dichroism spectroscopy as well as oriented and non-oriented solid-state NMR spectroscopy. This combination of methods indicates that in the presence of lipids with phosphatidylglycerol head groups, the topological equilibria of LAH4 is shifted towards more in-plane configurations even at neutral pH. In contrast, a transmembrane alignment is promoted when LAH4 interacts with membranes made of dimyristoyl phospholipids rather than palmitoyl-oleoyl-phospholipids. Finally, the addition of citrate buffer favours LAH4 transmembrane alignments, even at low pH, probably by complex formation with the cationic charges of the peptide. In summary, this study has revealed that the membrane topology of this peptide is readily modulated by the environmental conditions.
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Abbreviations
- CD:
-
Circular dichroism
- DMPC:
-
1, 2-Dimyristoyl-sn-glycero-3-phosphocholine
- DMPG:
-
1, 2-Dimyristoyl-sn-glycero-3-phospho-(1'-rac-glycerol)
- DSPC:
-
1, 2-Distearoyl-sn-glycero-3-phosphocholine
- DPPC:
-
1, 2-Dipalmitoyl-sn-glycero-3-phosphocholine
- hΦ17, KALP:
-
GKKLA LALAL ALALA LALAL KKA-CONH2
- KL14:
-
KKLLK KAKKL LKKL-CONH2
- LAH4:
-
KKALL ALALH HLAHL ALHLA LALKK A-CONH2
- NMR:
-
Nuclear magnetic resonance
- oSRCD:
-
Oriented synchrotron radiation circular dichroism
- PC:
-
Phosphatidylcholine
- PG:
-
Phosphatidylglycerol
- PGLa:
-
GMASK AGAIA GKIAK VALKA L-CONH2
- POPC:
-
1-Palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine
- POPG:
-
1-Palmitoyl-2-oleoyl-sn-glycero-3-phospho-(1'-rac-glycerol)
- r.h.:
-
Relative humidity
- SAXS:
-
Small angle X-ray scattering
- SRCD:
-
Synchrotron radiation circular dichroism
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Acknowledgments
BP was supported by a studentship from the European Commission under the 6th Framework Programme through the Marie-Curie Action: BIOCONTROL, contract number MCRTN–33439. Financial contributions (to BB) by the Agence Nationale de la Recherche (projects TRANSPEP, MembraneDNP, and the LabEx Chemistry of Complex Systems), the University of Strasbourg, the CNRS, the Région Alsace, the RTRA International Center of Frontier Research in Chemistry and the French Foundation for Medical Research (FRM) are gratefully acknowledged. This project was also supported by grants from the UK Biotechnology and Biological Sciences Research Council (to BAW) and an SRCD beamtime grant (to BAW) from the ISA (Aarhus, Denmark) Synchrotron, which is supported by the EU Integrated Infrastructure Initiative (I3), European Light Sources Activities (ELISA), under grant agreement No 226716.
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Perrone, B., Miles, A.J., Salnikov, E.S. et al. Lipid interactions of LAH4, a peptide with antimicrobial and nucleic acid transfection activities. Eur Biophys J 43, 499–507 (2014). https://doi.org/10.1007/s00249-014-0980-y
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DOI: https://doi.org/10.1007/s00249-014-0980-y