Cytoplasmic membrane is the target organelle for transition metal mediated damage induced by paraquat in Escherichia coli.
Cytoplasmic membrane is the target organelle for transition metal mediated damage induced by paraquat in Escherichia coli.
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细胞质膜是百草枯在大肠杆菌中诱导的过渡金属介导损伤的靶细胞器。
DOI:
10.1021/bi00407a049
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发表时间:
1988
期刊:
影响因子:
2.9
通讯作者:
Chevion,M
中科院分区:
文献类型:
--
作者:
Kohen,R;Chevion,M
Medical Research Foundation, Oklahoma City, Oklahoma 73104 Received June 19, 1987; Revised Manuscript Received December 3, 1987 abstract: Bacterial survival indicates that copper or iron is an essential mediator in paraquat toxicity in Escherichia coli [Kohen, R., & Chevion, M.(1985) Free Radical Res. Commun. 1, 79-88; Korbashi, P., Kohen, R., Katzhendler, J., & Chevion, M.(1986) J. Biol. Chem. 261, 12472-12476], In this study we have identified the cytoplasmic membrane as a target organelle in metal-mediated paraquat toxicity and have demonstrated the complete correlation of the membrane damage with the levels of adventitious copper (or iron). Theextent of membrane damage was related by use of four parameters:(a) the level of cellular ATP,(b) the level of cellular potassium,(c) the cellular capacity to accumulate and retain radiolabeled leucine, and (d) the cellular integrity as reflected by transmission electron microscopy (TEM). Exposure of bacterial cellsto a combination of paraquat and copper caused a marked decline in parameters a, b, and c. This decline was found to occur in parallel with, or even to precede, the sharp loss of survival of E. coli under the same conditions. Likewise, TEM micrographs clearly indicated alterations in cellular structure that possibly reflect sites of detachment of the cytoplasmic membrane from the bacterial capsule. In contradistinction, copper alone or paraquat alone could not bring about similar changes in cellular structure. These findings are in accord with the suggested site-specific metal-mediated Haber-Weiss mechanism for paraquat toxicity and support our notion that specific chelators of transition metals could reduce or prevent the biological deleterious effects of this herbicide. e toxicity of the herbicide paraquat (PQ2+),'also known as methyl viologen, has been extensively studied in a variety of biological models including Escherichia coli (Hassan & Fridovich, 1977, 1978, 1979a, b; Farrington et al., 1973; Kohen & Chevion, 1985a, b; Bagley et al., 1986). Fridovich and fThis study was supported by grants from the Council of Tobacco Research, USA (1900), from the NIH (ES-04296), and from the Geselschaft fur Strahlen-und Umweltforschung mbH Munchen, Neu-herberg, FRG.
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影响因子:
5.8
作者:
GUTTERIDGE, JMC;HALLIWELL, B
通讯作者:
HALLIWELL, B
DOI:
10.1016/s0021-9258(18)93387-9
发表时间:
1968
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Y. Anraku
通讯作者:
Y. Anraku
影响因子:
5.8
作者:
R. Kohen;M. Chevion
通讯作者:
M. Chevion
DOI:
10.1016/s0021-9258(18)67111-x
发表时间:
1986
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
P. Korbashi;R. Kohen;J. Katzhendler;M. Chevion
通讯作者:
M. Chevion
DOI:
10.1016/0304-4165(83)90365-3
发表时间:
1983
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
David A. Rowley;Barry Halliwell
通讯作者:
Barry Halliwell