Lipid reorganization induced by membrane-active peptides probed using differential scanning calorimetry.
The overlapping biological behaviors between some cell penetrating peptides (CPPs) and antimicrobial peptides (AMPs) suggest both common and different membrane interaction mechanisms. We thus explore the capacity of selected CPPs and AMPs to reorganize the planar distribution of binary lipid mixtures by means of differential scanning calorimetry (DSC). Additionally, membrane integrity assays and circular dichroism (CD) experiments were performed. Two CPPs (Penetratin and RL16) and AMPs belonging to the dermaseptin superfamily (Drs B2 and C-terminal truncated analog [1-23]-Drs B2 and two plasticins DRP-PBN2 and DRP-PD36KF) were selected. Herein we probed the impact of headgroup charges and acyl chain composition (length and unsaturation) on the peptide/lipid interaction by using binary lipid mixtures. All peptides were shown to be alpha-helical in all the lipid mixtures investigated, except for the two CPPs and [1-23]-Drs B2 in the presence of zwitterionic lipid mixtures where they were rather unstructured. Depending on the lipid composition and peptide sequence, simple binding to the lipid surface that occur without affecting the lipid distribution is observed in particular in the case of AMPs. Recruitments and segregation of lipids were observed, essentially for CPPs, without a clear relationship between peptide conformation and their effect in the lipid lateral organization. Nonetheless, in most cases after initial electrostatic recognition between the peptide charged amino acids and the lipid headgroups, the lipids with the lowest phase transition temperature were selectively recruited by cationic peptides while those with the highest phase transition were segregated. Membrane activities of CPPs and AMPs could be thus related to their preferential interactions with membrane defects that correspond to areas with marked fluidity. Moreover, due to the distinct membrane composition of prokaryotes and eukaryotes, lateral heterogeneity may be differently affected by cationic peptides leading to either uptake or/and antimicrobial activities.
Joanne
Pierre
P
UPMC Univ Paris 06, FRE 2852 Peptidome de la Peau d'Amphibiens, Paris F-75005, France.
Galanth
Cécile
C
Goasdoué
Nicole
N
Nicolas
Pierre
P
Sagan
Sandrine
S
Lavielle
Solange
S
Chassaing
Gérard
G
El Amri
Chahrazade
C
Alves
Isabel D
ID
D029845:Amphibian Proteins / Q000378:metabolism; D000818:Animals; D023181:Antimicrobial Cationic Peptides / Q000378:metabolism; D016466:CHO Cells; D002152:Calorimetry, Differential Scanning; D002352:Carrier Proteins; D002463:Cell Membrane Permeability / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D057846:Cell-Penetrating Peptides; D002942:Circular Dichroism; D006224:Cricetinae; D003412:Cricetulus; D005136:Eye Proteins / Q000378:metabolism; D006461:Hemolysis / Q000187:drug effects; D008563:Membrane Lipids / Q000737:chemistry*; D008566:Membranes / Q000378:metabolism; D008826:Microbial Sensitivity Tests; D009419:Nerve Tissue Proteins / Q000378:metabolism; D010455:Peptides / Q000737:chemistry; D011487:Protein Conformation; D051381:Rats; D013329:Structure-Activity Relationship
D029845:Amphibian Proteins; D023181:Antimicrobial Cationic Peptides; D002352:Carrier Proteins; D057846:Cell-Penetrating Peptides; D005136:Eye Proteins; D008563:Membrane Lipids; D009419:Nerve Tissue Proteins; D010455:Peptides; C070905:dermaseptin; C076104:plasticin; C414409:penetratin