MEMBRANE INTERACTIONS AND SURFACE HYDROPHOBICITY OF BACILLUS-THURINGIENSIS DELTA-ENDOTOXIN CRYIC

被引：32

作者：

BUTKO, P ^{[1
]}

COURNOYER, M ^{[1
]}

PUSZTAICAREY, M ^{[1
]}

SUREWICZ, WK ^{[1
]}

机构：

[1] NATL RES COUNCIL CANADA, INST BIOL SCI, OTTAWA K1A 0R6, ON, CANADA

来源：

FEBS LETTERS | 1994年 / 340卷 / 1-2期

关键词：

DELTA-ENDOTOXIN; FLUORESCENCE PROBES; MEMBRANE PERMEABILIZATION; SURFACE HYDROPHOBICITY; BACILLUS THURINGIENSIS;

D O I：

10.1016/0014-5793(94)80178-9

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：

The interaction between Bacillus thuringiensis insecticidal delta-endotoxin CryIC and phospholipid vesicles was studied by fluorescence spectroscopy. The toxin dissipates the diffusion potential across vesicular membranes, presumably by creating ion permeable channels or pores. This effect is pH-dependent and strongly increases under acidic conditions. The enhanced membrane-perturbing activity of CryIC at low pH correlates with the increased surface hydrophobicity of the toxin molecule. The membrane permeabilizing effect of the toxin is further increased by the presence of acidic phospholipids. These findings are discussed in relation to the mode of insecticidal action of the toxin.

引用

页码：89 / 92

页数：4

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