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大肠杆菌K-12热休克反应期间的拓扑异构酶活性

Topoisomerase activity during the heat shock response in Escherichia coli K-12.

作者信息

Camacho-Carranza R, Membrillo-Hernández J, Ramírez-Santos J, Castro-Dorantes J, Chagoya de Sánchez V, Gómez-Eichelmann M C

机构信息

Departamento de Biología Molecular, Universidad Nacional Autónoma de México, México, D.F.

出版信息

J Bacteriol. 1995 Jun;177(12):3619-22. doi: 10.1128/jb.177.12.3619-3622.1995.

Abstract

During the upshift of temperature from 30 to 42, 45, 47, or 50 degrees C, an increase in the level of supercoiling of a reporter plasmid was observed. This increase was present in groE and dnaK mutants but was inhibited in cells treated with chloramphenicol and novobiocin. The intracellular [ATP]/[ADP] ratio increased rapidly after an upshift in temperature from 30 to 47 degrees C and then decreased to reach a level above that observed at 30 degrees C. These results suggest that gyrase and proteins synthesized during heat shock are responsible for the changes seen in plasmid supercoiling. Proteins GroE and DnaK are probably not involved in this phenomenon.

摘要

在温度从30℃上升至42℃、45℃、47℃或50℃的过程中,观察到报告质粒的超螺旋水平增加。这种增加在groE和dnaK突变体中存在,但在用氯霉素和新生霉素处理的细胞中受到抑制。当温度从30℃上升至47℃后,细胞内[ATP]/[ADP]比值迅速增加,然后下降至高于30℃时观察到的水平。这些结果表明,热休克期间合成的gyrase和蛋白质是质粒超螺旋变化的原因。蛋白质GroE和DnaK可能不参与这一现象。

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