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Charged Antimicrobial Peptides Can Translocate across Membranes without Forming Channel-like Pores.
Ulmschneider JP
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How can highly charged, cationic antimicrobial peptides (AMPs) translocate across hydrophobic lipid bilayers despite the prohibitive energetic penalty to do so? A common explanation has been the formation of peptide-lined channels. However, for most AMPs, no structures of membrane pores have been found despite clear evidence of membrane leakage and antimicrobial activity. The study here suggests an alternative and simple reason: for the AMP PGLa from Xenopus laevis (charge +5), such pores are not needed to explain both leakage and peptide translocation. Elevated-temperature multimicrosecond equilibrium simulations at all-atomistic level reveal that peptides spontaneously translocate across the membrane individually on a timescale of tens of microseconds, without forming pores. Both surface-bound peptides and lipids assist in the one-by-one translocation of the charged side chains. Single peptides can remain in a transmembrane orientation for many microseconds, snorkeling some charged residues to one interface and some to the opposite, but without inducing a water channel. Instead of stable pores, short-lived water bridges occur when two or three peptides connect at their termini, allowing both ion translocation and lipid flip-flop via a brushlike mechanism usually involving the C terminus of one peptide. The results here suggest that for some specific antimicrobial and other membrane active peptides, pore formation may not have to be invoked at all to explain peptide translocation and membrane permeabilization, which may explain why no channel structures for them have been determined experimentally.
Ablan,
Charge Distribution Fine-Tunes the Translocation of α-Helical Amphipathic Peptides across Membranes.
2016, Pubmed
Ablan,
Charge Distribution Fine-Tunes the Translocation of α-Helical Amphipathic Peptides across Membranes.
2016,
Pubmed
Afonin,
Evaluating the amino acid CF3-bicyclopentylglycine as a new label for solid-state 19 F-NMR structure analysis of membrane-bound peptides.
2007,
Pubmed
Afonin,
Temperature-dependent transmembrane insertion of the amphiphilic peptide PGLa in lipid bilayers observed by solid state 19F NMR spectroscopy.
2008,
Pubmed
Andreu,
Solid-phase synthesis of PYLa and isolation of its natural counterpart, PGLa [PYLa-(4-24)] from skin secretion of Xenopus laevis.
1985,
Pubmed
,
Xenbase
Bechinger,
Orientations of amphipathic helical peptides in membrane bilayers determined by solid-state NMR spectroscopy.
1991,
Pubmed
,
Xenbase
Bechinger,
Structure and dynamics of the antibiotic peptide PGLa in membranes by solution and solid-state nuclear magnetic resonance spectroscopy.
1998,
Pubmed
Bechinger,
Orientations of helical peptides in membrane bilayers by solid state NMR spectroscopy.
1996,
Pubmed
,
Xenbase
Bennett,
Antimicrobial Peptide Simulations and the Influence of Force Field on the Free Energy for Pore Formation in Lipid Bilayers.
2016,
Pubmed
Bond,
Coarse-grained simulations of the membrane-active antimicrobial Peptide maculatin 1.1.
2008,
Pubmed
Brogden,
Antimicrobial peptides: pore formers or metabolic inhibitors in bacteria?
2005,
Pubmed
Chinchar,
Inactivation of viruses infecting ectothermic animals by amphibian and piscine antimicrobial peptides.
2004,
Pubmed
Choi,
Lights, Camera, Action! Antimicrobial Peptide Mechanisms Imaged in Space and Time.
2016,
Pubmed
Cruz,
A membrane-translocating peptide penetrates into bilayers without significant bilayer perturbations.
2013,
Pubmed
Epand,
Diversity of antimicrobial peptides and their mechanisms of action.
1999,
Pubmed
Glaser,
Orientation of the antimicrobial peptide PGLa in lipid membranes determined from 19F-NMR dipolar couplings of 4-CF3-phenylglycine labels.
2004,
Pubmed
Glaser,
Concentration-dependent realignment of the antimicrobial peptide PGLa in lipid membranes observed by solid-state 19F-NMR.
2005,
Pubmed
Glattard,
Investigations of the synergistic enhancement of antimicrobial activity in mixtures of magainin 2 and PGLa.
2016,
Pubmed
,
Xenbase
He,
A highly charged voltage-sensor helix spontaneously translocates across membranes.
2012,
Pubmed
Helmerhorst,
A critical comparison of the hemolytic and fungicidal activities of cationic antimicrobial peptides.
1999,
Pubmed
,
Xenbase
Hoffmann,
A novel peptide designated PYLa and its precursor as predicted from cloned mRNA of Xenopus laevis skin.
1983,
Pubmed
,
Xenbase
Hoskin,
Studies on anticancer activities of antimicrobial peptides.
2008,
Pubmed
Huang,
Molecular mechanism of antimicrobial peptides: the origin of cooperativity.
2006,
Pubmed
Klauda,
Update of the CHARMM all-atom additive force field for lipids: validation on six lipid types.
2010,
Pubmed
Leontiadou,
Antimicrobial peptides in action.
2006,
Pubmed
Lohner,
Biological activity and structural aspects of PGLa interaction with membrane mimetic systems.
2009,
Pubmed
,
Xenbase
MacCallum,
Partitioning of amino acid side chains into lipid bilayers: results from computer simulations and comparison to experiment.
2007,
Pubmed
MacKerell,
All-atom empirical potential for molecular modeling and dynamics studies of proteins.
1998,
Pubmed
Maloy,
Structure-activity studies on magainins and other host defense peptides.
1995,
Pubmed
Marks,
Spontaneous membrane-translocating peptides by orthogonal high-throughput screening.
2011,
Pubmed
Marquette,
Magainin 2-PGLa Interactions in Membranes - Two Peptides that Exhibit Synergistic Enhancement of Antimicrobial Activity.
2016,
Pubmed
Matsuzaki,
Mechanism of synergism between antimicrobial peptides magainin 2 and PGLa.
1998,
Pubmed
,
Xenbase
Pasupuleti,
Antimicrobial peptides: key components of the innate immune system.
2012,
Pubmed
Perrin,
Simulations of Membrane-Disrupting Peptides II: AMP Piscidin 1 Favors Surface Defects over Pores.
2016,
Pubmed
Pino-Angeles,
Pore Structure and Synergy in Antimicrobial Peptides of the Magainin Family.
2016,
Pubmed
Pokorny,
Kinetics of dye efflux and lipid flip-flop induced by delta-lysin in phosphatidylcholine vesicles and the mechanism of graded release by amphipathic, alpha-helical peptides.
2004,
Pubmed
Pokorny,
Mechanism and kinetics of delta-lysin interaction with phospholipid vesicles.
2002,
Pubmed
Richter,
Biosynthesis of peptides in the skin of Xenopus laevis: isolation of novel peptides predicted from the sequence of cloned cDNAs.
1985,
Pubmed
,
Xenbase
Salnikov,
Lipid-controlled peptide topology and interactions in bilayers: structural insights into the synergistic enhancement of the antimicrobial activities of PGLa and magainin 2.
2011,
Pubmed
Salnikov,
Membrane topologies of the PGLa antimicrobial peptide and a transmembrane anchor sequence by Dynamic Nuclear Polarization/solid-state NMR spectroscopy.
2016,
Pubmed
Sengupta,
Toroidal pores formed by antimicrobial peptides show significant disorder.
2008,
Pubmed
Sochacki,
Real-time attack on single Escherichia coli cells by the human antimicrobial peptide LL-37.
2011,
Pubmed
Song,
Crystal structure and functional mechanism of a human antimicrobial membrane channel.
2013,
Pubmed
Soravia,
Antimicrobial properties of peptides from Xenopus granular gland secretions.
1988,
Pubmed
,
Xenbase
Strandberg,
AMPs and OMPs: Is the folding and bilayer insertion of β-stranded outer membrane proteins governed by the same biophysical principles as for α-helical antimicrobial peptides?
2015,
Pubmed
Strandberg,
Influence of hydrophobic residues on the activity of the antimicrobial peptide magainin 2 and its synergy with PGLa.
2015,
Pubmed
,
Xenbase
Strandberg,
2H-NMR and MD Simulations Reveal Membrane-Bound Conformation of Magainin 2 and Its Synergy with PGLa.
2016,
Pubmed
,
Xenbase
Strandberg,
Solid-state NMR analysis of the PGLa peptide orientation in DMPC bilayers: structural fidelity of 2H-labels versus high sensitivity of 19F-NMR.
2006,
Pubmed
Strandberg,
Synergistic transmembrane insertion of the heterodimeric PGLa/magainin 2 complex studied by solid-state NMR.
2009,
Pubmed
,
Xenbase
Tremouilhac,
Synergistic transmembrane alignment of the antimicrobial heterodimer PGLa/magainin.
2006,
Pubmed
,
Xenbase
Tremouilhac,
Conditions affecting the re-alignment of the antimicrobial peptide PGLa in membranes as monitored by solid state 2H-NMR.
2006,
Pubmed
Ulmschneider,
Reorientation and dimerization of the membrane-bound antimicrobial peptide PGLa from microsecond all-atom MD simulations.
2012,
Pubmed
,
Xenbase
Ulmschneider,
Mechanism and kinetics of peptide partitioning into membranes from all-atom simulations of thermostable peptides.
2010,
Pubmed
Ulmschneider,
In silico partitioning and transmembrane insertion of hydrophobic peptides under equilibrium conditions.
2011,
Pubmed
Ulmschneider,
Peptide partitioning properties from direct insertion studies.
2010,
Pubmed
Ulmschneider,
Spontaneous transmembrane helix insertion thermodynamically mimics translocon-guided insertion.
2014,
Pubmed
Wang,
How reliable are molecular dynamics simulations of membrane active antimicrobial peptides?
2014,
Pubmed
Wang,
APD3: the antimicrobial peptide database as a tool for research and education.
2016,
Pubmed
Wang,
Spontaneous formation of structurally diverse membrane channel architectures from a single antimicrobial peptide.
2016,
Pubmed
Wheaten,
Translocation of cationic amphipathic peptides across the membranes of pure phospholipid giant vesicles.
2013,
Pubmed
White,
How translocons select transmembrane helices.
2008,
Pubmed
Wieprecht,
Membrane binding and pore formation of the antibacterial peptide PGLa: thermodynamic and mechanistic aspects.
2000,
Pubmed
,
Xenbase
Wimley,
Antimicrobial peptides: successes, challenges and unanswered questions.
2011,
Pubmed
Yandek,
Mechanism of the cell-penetrating peptide transportan 10 permeation of lipid bilayers.
2007,
Pubmed
Yandek,
Wasp mastoparans follow the same mechanism as the cell-penetrating peptide transportan 10.
2009,
Pubmed
van 't Hof,
Antimicrobial peptides: properties and applicability.
2001,
Pubmed