Ion transport across a phospholipid membrane mediated by the peptide trichogin GA IV

被引:28
作者
Kropacheva, TN
Raap, T
机构
[1] Leiden Univ, Leiden Inst Chem, Gorlaeus Labs, NL-2300 RA Leiden, Netherlands
[2] Udmurt State Univ, Dept Chem, Izhevsk, Russia
来源
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES | 2002年 / 1567卷 / 1-2期
关键词
ion permeation; peptaibol; trichogin; zervamicin; large unilamellar vesicle; transmembrane potential;
D O I
10.1016/S0005-2736(02)00616-8
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
Trichogin GA IV is a special member of a class of peptaibols that are linear peptide antibiotics of fungal origin, characterised by the presence of a variable number of alpha-aminoisobutyric acid residues, an acyl group at the N-terminus and a 1,2-amino alcohol at the C-terminus. Most of the peptaibols display ion-channel-forming or at least membrane-modifying properties. The 11-residue-long trichogin GA IV is not only one of shortest peptaibols, but it is also unique for its n-octanoyl group instead of the more common found acetyl group at the N-terminus. For the first time we have found that this lipopeptaibol is able to enhance conduction of monovalent cations through membranes of large unilamellar vesicles (LUVs). The influence of the [Leu-OMe]trichogin GA IV analogue (TRI) on ion permeation was studied under a variety of conditions (lipid composition, lipid-to-peptide ratio and a transmembrane potential). Parallel experiments were performed with the 16-residue long, channel-forming peptaibol, zervamicin (ZER). For the two peptides, the permeability between K+ and Na+ was found to be different. In addition, the ion diffusion rate dependencies on the peptide concentration are observed to be different. This might indicate that a different number of aggregated molecules are involved in the rate-limiting step, i.e. 3-4 (TRI) and 4-7 (ZER). In the presence of TRI, dissipation of the transmembrane potential, Deltapsi, was observed with a rate to be dependent on the magnitude of both initial Deltapsi and peptide concentration. Both peptides were activated by a cis-positive but not by cis-negative Deltapsi. Under identical conditions the ion-conducting efficiency of zervamicin was 100-200 times higher than that of trichogin. Our results show that, unlike for zervamicin, the membrane-modifying activity of trichogin is not associated with a channel mechanism. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:193 / 203
页数:11
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