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TitleRepurposing of a DNA segregation machinery into a cytoskeletal system controlling cell shape.
Journal, issue, pagesScience, Vol. 392, Issue 6795, Page eaea6343, Year 2026
Publish dateApr 16, 2026
AuthorsBenjamin L Springstein / Manjunath G Javoor / Daniela Megrian / Roman Hajdu / Dustin M Hanke / Bettina Zens / Gregor L Weiss / Florian K M Schur / Martin Loose /
PubMed AbstractBacteria, like eukaryotes, use conserved cytoskeletal systems for intracellular organization. The plasmid-encoded ParMRC system forms actin-like filaments that segregate low-copy number plasmids. In ...Bacteria, like eukaryotes, use conserved cytoskeletal systems for intracellular organization. The plasmid-encoded ParMRC system forms actin-like filaments that segregate low-copy number plasmids. In multicellular cyanobacteria such as sp., we found that a chromosomally encoded ParMR system has evolved into a cytoskeletal system named CorMR with a function in cell shape control rather than DNA segregation. Live-cell imaging, in vitro reconstitution, and cryo-electron microscopy revealed that CorM formed dynamically unstable, antiparallel double-stranded filaments that were recruited to the membrane by CorR through an amphipathic helix conserved in multicellular cyanobacteria. CorMR filaments were regulated by MinC, which excluded them from the poles and division plane. Comparative genomics indicated that the repurposing of ParMR and Min systems coevolved with cyanobacterial multicellularity, highlighting the evolutionary plasticity of cytoskeletal systems in bacteria.
External linksScience / PubMed:41990175
MethodsEM (single particle) / EM (tomography)
Resolution3.92 - 7.14 Å
Structure data

54060

9rmi

EMDB-54060, PDB-9rmi:
Cryo-EM structure of the CorM filament in the presence of CorR from cyanobacterium Anabaena sp. PCC 7120
Method: EM (single particle) / Resolution: 3.92 Å

EMDB-54061: Cryo-EM structure of the CorM filament from cyanobacterium Anabaena sp. PCC 7120
Method: EM (single particle) / Resolution: 7.14 Å

EMDB-54062: Cryo-EM structure of the delta1-40 CorM filament from cyanobacterium Anabaena sp. PCC 7120
Method: EM (single particle) / Resolution: 4.42 Å

EMDB-55454: Cryo-electron tomogram of cyanobacterium Anabaena sp. PCC 7120 with putative CorM filaments (Isonet-processed)
Method: EM (tomography)

EMDB-55455: Cryo-electron tomogram of delta-cse mutant cyanobacterium Anabaena sp. PCC 7120 with putative CorM filaments
Method: EM (tomography)

Chemicals

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM

Source
  • nostoc sp. pcc 7120 = fachb-418 (bacteria)
KeywordsSTRUCTURAL PROTEIN / Cell shape / cytoskeleton

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