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
Chevion,M
中科院分区:
生物学3区
文献类型:
--
作者:
Kohen,R;Chevion,M

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医学研究基金会,俄克拉荷马州市,俄克拉荷马州73104,1987年6月19日接收; 1987年12月3日接收的修订版Mandalpt摘要:细菌存活表明铜或铁是大肠杆菌中百草枯毒性的重要介质[Kohen,R.,& Chevion,M. 03 The Dog of the Woman(1985)1,79-88; Korbashi,P.,科恩河,Katzhendler,J.,& Chevion,M.(1986)J.Biol.Chem.261,12472-12476],在这项研究中,我们已经确定细胞质膜是金属介导的百草枯毒性中的靶细胞器,并且已经证明了膜损伤与外源铜(或铁)水平的完全相关性。膜损伤的程度与四个参数有关:(a)细胞ATP水平,(B)细胞钾水平,(c)细胞积累和保留放射性标记亮氨酸的能力,和(d)透射电子显微镜(TEM)反映的细胞完整性。将细菌细胞暴露于百草枯和铜的混合物中会导致参数a、B和c显著下降。发现这种下降与E.在相同条件下,同样,TEM显微照片清楚地表明细胞结构的改变,可能反映了细胞质膜从细菌荚膜中分离的位点。相比之下,单独的铜或百草枯不能引起细胞结构的类似变化。这些发现与百草枯毒性的位点特异性金属介导的Haber-Weiss机制雅阁,并支持我们的观点,即过渡金属的特异性螯合剂可以减少或防止这种除草剂的生物有害影响。除草剂百草枯(PQ 2+)(也称为甲基紫精)的毒性已经在包括大肠杆菌在内的多种生物模型中进行了广泛研究(哈桑& Fridovich,1977,1978,1979 a,B;法林顿等人,1973; Kohen & Chevion,1985 a,B;巴格利等人,1986年)。Fridovich和f这项研究得到了美国烟草研究理事会(1900年)、NIH(ES-04296)和德国慕尼黑市环境与辐射研究协会(Geselschaft fur Strahlen-und Umweltforschung mbH Munchen,Neu-herberg,FRG)的赠款。
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.
DOI: 10.1016/0006-2952(82)90136-8
发表时间: 1982-01-01
影响因子: 5.8
作者:
GUTTERIDGE, JMC;HALLIWELL, B
通讯作者: HALLIWELL, B
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发表时间: 1968
期刊: The Journal of biological chemistry
影响因子: --
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在实验室小鼠中,铁会增强百草枯的毒性,而去铁敏则可降低百草枯的毒性。
DOI: 10.1016/0006-2952(85)90659-8
发表时间: 1985
影响因子: 5.8
作者:
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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:
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发表时间: 1983
期刊: Biochimica et biophysica acta
影响因子: --
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