The studies of ParA and ParB dynamics reveal asymmetry of chromosome segregation in mycobacteria

Molecular Microbiology
Katarzyna GindaJohn D McKinney

Abstract

Active segregation of bacterial chromosomes usually involves the action of ParB proteins, which bind in proximity of chromosomal origin (oriC) regions forming nucleoprotein complexes - segrosomes. Newly duplicated segrosomes are moved either uni- or bidirectionally by the action of ATPases - ParA proteins. In Mycobacterium smegmatis the oriC region is located in an off-centred position and newly replicated segrosomes are segregated towards cell poles. The elimination of M. smegmatis ParA and/or ParB leads to chromosome segregation defects. Here, we took advantage of microfluidic time-lapse fluorescent microscopy to address the question of ParA and ParB dynamics in M. smegmatis and M. tuberculosis cells. Our results reveal that ParB complexes are segregated in an asymmetrical manner. The rapid movement of segrosomes is dependent on ParA that is transiently associated with the new pole. Remarkably in M. tuberculosis, the movement of the ParB complex is much slower than in M. smegmatis, but segregation as in M. smegmatis lasts approximately 10% of the cell cycle, which suggests a correlation between segregation dynamics and the growth rate. On the basis of our results, we propose a model for the asymmetric action of segregation ma...Continue Reading

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Citations

Nov 9, 2017·MBio·Joanna HołówkaJolanta Zakrzewska-Czerwińska
May 16, 2018·Pathogens and Disease·Julia PuffalYasu S Morita
May 10, 2020·The Analyst·Xuelin JinKyubong Jo
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Nov 12, 2019·Frontiers in Microbiology·Feng Gao, Alan C Leonard
Jul 11, 2020·Advanced Biosystems·Daniel HürtgenVictor Sourjik
Feb 5, 2021·Scientific Reports·Marta KołodziejJolanta Zakrzewska-Czerwińska
Sep 3, 2019·Current Biology : CB·Philipp M WeberSilvia Bulgheresi

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