8BL4

Cryo-EM structure of a contractile injection system in Streptomyces coelicolor, the sheath-tube module in extended state.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Cytoplasmic contractile injection systems mediate cell death in Streptomyces.

Casu, B.Sallmen, J.W.Schlimpert, S.Pilhofer, M.

(2023) Nat Microbiol 8: 711-726

  • DOI: https://doi.org/10.1038/s41564-023-01341-x
  • Primary Citation of Related Structures:  
    8BKY, 8BL4

  • PubMed Abstract: 

    Contractile injection systems (CIS) are bacteriophage tail-like structures that mediate bacterial cell-cell interactions. While CIS are highly abundant across diverse bacterial phyla, representative gene clusters in Gram-positive organisms remain poorly studied. Here we characterize a CIS in the Gram-positive multicellular model organism Streptomyces coelicolor and show that, in contrast to most other CIS, S. coelicolor CIS (CIS Sc ) mediate cell death in response to stress and impact cellular development. CIS Sc are expressed in the cytoplasm of vegetative hyphae and are not released into the medium. Our cryo-electron microscopy structure enabled the engineering of non-contractile and fluorescently tagged CIS Sc assemblies. Cryo-electron tomography showed that CIS Sc contraction is linked to reduced cellular integrity. Fluorescence light microscopy furthermore revealed that functional CIS Sc mediate cell death upon encountering different types of stress. The absence of functional CIS Sc had an impact on hyphal differentiation and secondary metabolite production. Finally, we identified three putative effector proteins, which when absent, phenocopied other CIS Sc mutants. Our results provide new functional insights into CIS in Gram-positive organisms and a framework for studying novel intracellular roles, including regulated cell death and life-cycle progression in multicellular bacteria.


  • Organizational Affiliation

    Department of Biology, Institute of Molecular Biology and Biophysics, Eidgenössische Technische Hochschule Zürich, Zürich, Switzerland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phage tail sheath family protein539Streptomyces coelicolor A3(2)Mutation(s): 0 
UniProt
Find proteins for Q9L0N8 (Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145))
Explore Q9L0N8 
Go to UniProtKB:  Q9L0N8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9L0N8
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Phage tail protein149Streptomyces coelicolor A3(2)Mutation(s): 0 
UniProt
Find proteins for Q9L0N9 (Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145))
Explore Q9L0N9 
Go to UniProtKB:  Q9L0N9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9L0N9
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerland679209
European Research Council (ERC)European Union679209
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/T015349/1

Revision History  (Full details and data files)

  • Version 1.0: 2023-03-15
    Type: Initial release
  • Version 1.1: 2023-03-22
    Changes: Database references
  • Version 1.2: 2023-04-12
    Changes: Database references
  • Version 1.3: 2024-07-24
    Changes: Data collection