On the mechanism of non-endosomial peptide-mediated cellular delivery of nucleic acids

被引:99
作者
Deshayes, S [1 ]
Gerbal-Chaloin, S [1 ]
Morris, MC [1 ]
Aldrian-Herrada, G [1 ]
Charnet, P [1 ]
Divita, G [1 ]
Heitz, F [1 ]
机构
[1] CNRS, CRBM, FRE 2593, F-34293 Montpellier, France
来源
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES | 2004年 / 1667卷 / 02期
关键词
cell-penetrating peptide; conformation; lipid peptide interaction; translocation mechanism;
D O I
10.1016/j.bbamem.2004.09.010
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Recently, we described a new strategy for the delivery of nucleic acids into mammalian cells, based on an amphipathic peptide of 27 residues called MPG, which was designed on the basis of a hydrophobic domain derived from a fusion sequence associated with a nuclear localization sequence and separated by a linker. This peptide carrier constitutes a powerful tool for the delivery of nucleic acids in cultured cells, without requiring any covalent coupling. We have examined the conformational states of MPG in its free form and complexed with a cargo, as well as its ability to interact with phospholipids, and have investigated the structural consequences of these interactions. In spite of its similarity to the similarly designed cell-penetrating peptide Pep-1, MPG behaves significantly differently from the conformational point of view. Circular dichroism (CD) analysis reveals a transition from a nonstructured to a beta-sheet conformation upon interaction with phospholipids. We propose that the membrane crossing process involves formation of a transient transmembrane pore-like structure. Partial conformational change of MPG is associated with formation of a complex with its cargo, and an increase in sheet content occurs upon association with the cell membrane. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:141 / 147
页数:7
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