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Volume 161, Issue 2

Reduction in DNA topoisomerase I level affects growth, phenotype and nucleoid architecture of Free

Abstract

The steady-state negative supercoiling of eubacterial genomes is maintained by the action of DNA topoisomerases. Topoisomerase distribution varies in different species of mycobacteria. While () contains a single type I (TopoI) and a single type II (Gyrase) enzyme, () and other members harbour additional relaxases. TopoI is essential for survival. However, the necessity of TopoI or other relaxases in has not been investigated. To recognize the importance of TopoI for growth, physiology and gene expression of , we have developed a conditional knock-down strain of TopoI in . The TopoI-depleted strain exhibited extremely slow growth and drastic changes in phenotypic characteristics. The cessation of growth indicates the essential requirement of the enzyme for the organism in spite of having additional DNA relaxation enzymes in the cell. Notably, the imbalance in TopoI level led to the altered expression of topology modulatory proteins, resulting in a diffused nucleoid architecture. Proteomic and transcript analysis of the mutant indicated reduced expression of the genes involved in central metabolic pathways and core DNA transaction processes. RNA polymerase (RNAP) distribution on the transcription units was affected in the TopoI-depleted cells, suggesting global alteration in transcription. The study thus highlights the essential requirement of TopoI in the maintenance of cellular phenotype, growth characteristics and gene expression in mycobacteria. A decrease in TopoI level led to altered RNAP occupancy and impaired transcription elongation, causing severe downstream effects.

  • Received:
  • Accepted:
  • Published Online:
© 2015 The Authors
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2015-02-01
2024-05-05
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Reduction in DNA topoisomerase I level affects growth, phenotype and nucleoid architecture of Mycobacterium smegmatis
Microbiology 161, 341 (2015); https://doi.org/10.1099/mic.0.000014
/content/journal/micro/10.1099/mic.0.000014
/content/journal/micro/10.1099/mic.0.000014
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