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首页> 外文期刊>Journal of bacteriology >Defense against Protein Carbonylation by DnaK/DnaJ and Proteases of the Heat Shock Regulon
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Defense against Protein Carbonylation by DnaK/DnaJ and Proteases of the Heat Shock Regulon

机译:DnaK / DnaJ和热休克调节蛋白对蛋白质羰基化的防御作用

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Protein carbonylation is an irreversible oxidative modification that increases during organism aging and bacterial growth arrest. We analyzed whether the heat shock regulon has a role in defending Escherichia coli cells against this deleterious modification upon entry into stationary phase. Providing the cell with ectopically elevated levels of the heat shock transcription factor, σ32, effectively reduced stasis-induced carbonylation. Separate overproduction of the major chaperone systems, DnaK/DnaJ and GroEL/GroES, established that the former of these is more important in counteracting protein carbonylation. Deletion of the heat shock proteases Lon and HslVU enhanced carbonylation whereas a clpP deletion alone had no effect. However, ClpP appears to have a role in reducing protein carbonyls in cells lacking Lon and HslVU. Proteomic immunodetection of carbonylated proteins in the wild-type, lon, and hslVU strains demonstrated that the same spectrum of proteins displayed a higher load of carbonyl groups in the lon and hslVU mutants. These proteins included the β-subunit of RNA polymerase, elongation factors Tu and G, the E1 subunit of the pyruvate dehydrogenase complex, isocitrate dehydrogenase, 6-phosphogluconate dehydrogenase, and serine hydroxymethyltranferase.
机译:蛋白质羰基化是不可逆的氧化修饰,在生物衰老和细菌生长停滞期间会增加。我们分析了进入休克期后,热休克调节子是否在防御大肠杆菌细胞免受这种有害修饰的作用。为细胞提供异位升高的热激转录因子σ 32 可以有效地减少瘀滞诱导的羰基化。主要的分子伴侣系统DnaK / DnaJ和GroEL / GroES的单独过量生产已确定,前者在抵消蛋白质羰基化作用方面更为重要。热休克蛋白酶Lon和HslVU的缺失增强了羰基化作用,而单独的 clpP 缺失则没有作用。但是,ClpP似乎在减少缺乏Lon和HslVU的细胞中减少蛋白质羰基的作用。蛋白质组免疫检测野生株, lon hslVU 菌株中的羰基化蛋白表明,相同光谱的蛋白质在 lon中显示出更高的羰基负载量 hslVU 突变体。这些蛋白质包括RNA聚合酶的β亚基,延伸因子Tu和G,丙酮酸脱氢酶复合物的E1亚基,异柠檬酸脱氢酶,6-磷酸葡萄糖酸脱氢酶和丝氨酸羟甲基转移酶。

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