Effects of Carbon Source on Expression of Fo Genes and on the Stoichiometry of the c Subunit in the F1Fo ATPase of Escherichia coli

Effects of Carbon Source on Expression of Fo Genes and on the Stoichiometry of the c Subunit in the F1Fo ATPase of Escherichia coli
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碳源对大肠杆菌Fo基因表达及F1Fo ATP酶c亚基化学计量的影响

DOI:
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发表时间:
1998
影响因子:
3.2
通讯作者:
W. Brusilow
W. Brusilow
中科院分区:
生物学3区
文献类型:
--
作者:
R. A. Schemidt;J. Qu;James R. Williams;W. Brusilow

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摘要大肠杆菌F1Fo质子转运ATP酶膜结合Fosector基因的表达可以响应代谢条件的变化,这些变化反映在寡聚Fo质子通道亚基化学计量的改变中。转录和翻译lacZ融合的启动子和两个Fo基因表明,在生长过程中的nonfermentable碳源琥珀酸,转录的操纵子和翻译的uncB,编码的一个亚基的Fo,是高于在葡萄糖生长。相比之下,编码Fo的c亚基的uncE基因的翻译在葡萄糖生长期间比在琥珀酸生长期间更高。uncB和uncE的翻译率随着培养密度的增加而改变,但转录率不改变。c化学计量的定量显示,更多的c亚基组装成F1Fo ATP酶在葡萄糖上生长的细胞比在琥珀酸上生长的细胞。E.因此,大肠杆菌似乎具有调节ATP酶的组成的机制,并且推测,ATP酶的功能响应于代谢环境。
ABSTRACT Expression of the genes for the membrane-bound Fosector of the Escherichia coli F1Foproton-translocating ATPase can respond to changes in metabolic conditions, and these changes are reflected in alterations in the subunit stoichiometry of the oligomeric Fo proton channel. Transcriptional and translational lacZ fusions to the promoter and to two Fo genes show that, during growth on the nonfermentable carbon source succinate, transcription of the operon and translation of uncB, encoding the a subunit of Fo, are higher than during growth on glucose. In contrast, translation of the uncE gene, encoding the c subunit of Fo, is higher during growth on glucose than during growth on succinate. Translation rates of both uncB anduncE change as culture density increases, but transcription rates do not. Quantitation of the c stoichiometry shows that more c subunits are assembled into the F1Fo ATPase in cells grown on glucose than in cells grown on succinate. E. coli therefore appears to have a mechanism for regulating the composition and, presumably, the function of the ATPase in response to metabolic circumstances.
uncE 核糖体结合位点突变对大肠杆菌质子转位 ATP 酶合成和组装的影响。
DOI: --
发表时间: 1988
期刊: The Journal of biological chemistry
影响因子: --
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二环己基碳二亚胺与 F0 复合物的单一蛋白脂质(c 亚基)反应后,大肠杆菌 F1F0 的 H -ATP 酶活性被阻断。
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大肠杆菌 H-ATP 酶复合物中亚基的化学计量。
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发表时间: 1982
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