8BKY

Cryo-EM structure of a contractile injection system in Streptomyces coelicolor, the contracted sheath shell.

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.1 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 

  • DOI: 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 ...

    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. pilhofer@biol.ethz.ch.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Phage tail sheath protein
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X
534Streptomyces coelicolor A3(2)Mutation(s): 0 
UniProt
Find proteins for D6EJW1 (Streptomyces lividans TK24)
Explore D6EJW1 
Go to UniProtKB:  D6EJW1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD6EJW1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: HELICAL 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerland31003A_179255
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