%0 Journal Article
%T A conserved mechanism drives partition complex assembly on bacterial chromosomes and plasmids
%+ Laboratoire de microbiologie et génétique moléculaires - UMR5100 (LMGM)
%+ Laboratoire d'Ingénierie des Systèmes Biologiques et des Procédés (LISBP)
%+ Laboratoire Charles Coulomb (L2C)
%+ Dynamique des interactions membranaires normales et pathologiques (DIMNP)
%+ Systèmes Complexes et Phénomènes Nonlinéaires (SCPN)
%A Debaugny, Roxanne
%A Sanchez, Aurore
%A Rech, Jérôme
%A Labourdette, Delphine
%A Dorignac, Jerome
%A Geniet, Frederic
%A Palmeri, John
%A Parmeggiani, Andrea
%A Boudsocq, François
%A Le Berre, Véronique
%A Walter, Jean-Charles
%A Bouet, Jean-Yves
%Z CNRS INPHYNITI program; Universite de Toulouse [APR14]; Labex NUMEV [AAP 2013-2-005; 2015-2-055; 2016-1-024]
%< avec comité de lecture
%Z L2C:18-131
%@ 1744-4292
%J Molecular Systems Biology
%I EMBO Press
%V 14
%N 11
%P e8516
%8 2018
%D 2018
%R 10.15252/msb.20188516
%M 30446599
%K DNA segregation
%K Escherichia coli
%K F plasmid
%K ParABS
%K plasmid partition
%Z Life Sciences [q-bio]/Biochemistry, Molecular Biology
%Z Physics [physics]/Physics [physics]/Biological Physics [physics.bio-ph]
%Z Life Sciences [q-bio]/Microbiology and Parasitology/BacteriologyJournal articles
%X Chromosome and plasmid segregation in bacteria are mostly driven by ParABS systems. These DNA partitioning machineries rely on large nucleoprotein complexes assembled on centromere sites (parS). However, the mechanism of how a few parS-bound ParB proteins nucleate the formation of highly concentrated ParB clusters remains unclear despite several proposed physico-mathematical models. We discriminated between these different models by varying some key parameters in vivo using the plasmid F partition system. We found that ‘Nucleation & caging’ is the only coherent model recapitulating in vivo data. We also showed that the stochastic self-assembly of partition complexes (i) does not directly involve ParA, (ii) results in a dynamic structure of discrete size independent of ParB concentration, and (iii) is not perturbed by active transcription but is by protein complexes. We refined the ‘Nucleation & Caging’ model and successfully applied it to the chromosomally-encoded Par system of Vibrio cholerae, indicating that this stochastic self-assembly mechanism is widely conserved from plasmids to chromosomes.
%G English
%2 https://hal.science/hal-01926457/document
%2 https://hal.science/hal-01926457/file/e8516.full.pdf
%L hal-01926457
%U https://hal.science/hal-01926457
%~ UNIV-TLSE3
%~ CNRS
%~ UNIV-MONTP1
%~ UNIV-MONTP2
%~ INSA-TOULOUSE
%~ INRA
%~ DIMNP
%~ L2C
%~ AGREENIUM
%~ MIPS
%~ BS
%~ UNIV-MONTPELLIER
%~ INSA-GROUPE
%~ LPHI
%~ TBI
%~ INRAE
%~ ANR
%~ INRAEOCCITANIETOULOUSE
%~ UNIV-UT3
%~ UT3-INP
%~ UT3-TOULOUSEINP
%~ UM-2015-2021
%~ TBI-TECH
%~ LMGM