Journal
ELIFE
Volume 10, Issue -, Pages -Publisher
ELIFE SCIENCES PUBLICATIONS LTD
DOI: 10.7554/eLife.65651
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Funding
- NIDDK Intramural Research Fund
- NHLBI Intramural Research Fund
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ParABS partition system, which consists of parS DNA sequence, ParB-CTPase, and ParA-ATPase, ensures accurate segregation of bacterial chromosomes and low-copy-number plasmids. The study investigated how ParB(F) activates ParA(F)-ATPase and found that CTP or parS(F) can enhance the ATPase rate without significantly accelerating the assembly of ParA(F)-ParB(F) complex. Through interactions with two ParB(F) N-terminal domains, DNA-bound ParA(F)-ATP dimers are activated for ATP hydrolysis.
ParABS partition systems, comprising the centromere-like DNA sequence parS, the parS-binding ParB-CTPase, and the nucleoid-binding ParA-ATPase, ensure faithful segregation of bacterial chromosomes and low-copy-number plasmids. F-plasmid partition complexes containing ParB(F) and parS(F) move by generating and following a local concentration gradient of nucleoid-bound ParA(F). However, the process through which ParB(F) activates ParA(F)-ATPase has not been defined. We studied CTP- and parS(F)-modulated ParA(F)-ParB(F) complex assembly, in which DNA-bound ParA(F)-ATP dimers are activated for ATP hydrolysis by interacting with two ParB(F) N-terminal domains. CTP or parS(F) enhances the ATPase rate without significantly accelerating ParA(F)-ParB(F) complex assembly. Together, parS(F) and CTP accelerate ParA(F)-ParB(F) assembly without further significant increase in ATPase rate. Magnetic-tweezers experiments showed that CTP promotes multiple ParB(F) loading onto parS(F)-containing DNA, generating condensed partition complex-like assemblies. We propose that ParB(F) in the partition complex adopts a conformation that enhances ParB(F)-ParB(F) and ParA(F)-ParB(F) interactions promoting efficient partitioning.
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