ParA and ParB coordinate chromosome segregation with cell elongation and division during Streptomyces sporulation.

Abstract:

:In unicellular bacteria, the ParA and ParB proteins segregate chromosomes and coordinate this process with cell division and chromosome replication. During sporulation of mycelial Streptomyces, ParA and ParB uniformly distribute multiple chromosomes along the filamentous sporogenic hyphal compartment, which then differentiates into a chain of unigenomic spores. However, chromosome segregation must be coordinated with cell elongation and multiple divisions. Here, we addressed the question of whether ParA and ParB are involved in the synchronization of cell-cycle processes during sporulation in Streptomyces To answer this question, we used time-lapse microscopy, which allows the monitoring of growth and division of single sporogenic hyphae. We showed that sporogenic hyphae stop extending at the time of ParA accumulation and Z-ring formation. We demonstrated that both ParA and ParB affect the rate of hyphal extension. Additionally, we showed that ParA promotes the formation of massive nucleoprotein complexes by ParB. We also showed that FtsZ ring assembly is affected by the ParB protein and/or unsegregated DNA. Our results indicate the existence of a checkpoint between the extension and septation of sporogenic hyphae that involves the ParA and ParB proteins.

journal_name

Open Biol

journal_title

Open biology

authors

Donczew M,Mackiewicz P,Wróbel A,Flärdh K,Zakrzewska-Czerwińska J,Jakimowicz D

doi

10.1098/rsob.150263

subject

Has Abstract

pub_date

2016-04-01 00:00:00

pages

150263

issue

4

issn

2046-2441

pii

rsob.150263

journal_volume

6

pub_type

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