8B11

cryo-EM structure of carboxysomal mini-shell: icosahedral assembly from CsoS4A/1A and CsoS2 co-expression (T = 4)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.52 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Models: experimental
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Literature

Intrinsically disordered CsoS2 acts as a general molecular thread for alpha-carboxysome shell assembly.

Ni, T.Jiang, Q.Ng, P.C.Shen, J.Dou, H.Zhu, Y.Radecke, J.Dykes, G.F.Huang, F.Liu, L.N.Zhang, P.

(2023) Nat Commun 14: 5512-5512

  • DOI: https://doi.org/10.1038/s41467-023-41211-y
  • Primary Citation of Related Structures:  
    8B0Y, 8B11, 8B12

  • PubMed Abstract: 

    Carboxysomes are a paradigm of self-assembling proteinaceous organelles found in nature, offering compartmentalisation of enzymes and pathways to enhance carbon fixation. In α-carboxysomes, the disordered linker protein CsoS2 plays an essential role in carboxysome assembly and Rubisco encapsulation. Its mechanism of action, however, is not fully understood. Here we synthetically engineer α-carboxysome shells using minimal shell components and determine cryoEM structures of these to decipher the principle of shell assembly and encapsulation. The structures reveal that the intrinsically disordered CsoS2 C-terminus is well-structured and acts as a universal "molecular thread" stitching through multiple shell protein interfaces. We further uncover in CsoS2 a highly conserved repetitive key interaction motif, [IV]TG, which is critical to the shell assembly and architecture. Our study provides a general mechanism for the CsoS2-governed carboxysome shell assembly and cargo encapsulation and further advances synthetic engineering of carboxysomes for diverse biotechnological applications.


  • Organizational Affiliation

    Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK. taoni@hku.hk.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carboxysome shell vertex protein CsoS4A83Halothiobacillus neapolitanusMutation(s): 0 
Gene Names: csoS4AorfAHneap_0918
UniProt
Find proteins for O85043 (Halothiobacillus neapolitanus (strain ATCC 23641 / c2))
Explore O85043 
Go to UniProtKB:  O85043
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO85043
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Major carboxysome shell protein CsoS1AB [auth C],
C [auth D],
D [auth E]
98Halothiobacillus neapolitanusMutation(s): 0 
Gene Names: csoS1AcsoS1Hneap_0915
UniProt
Find proteins for P45689 (Halothiobacillus neapolitanus (strain ATCC 23641 / c2))
Explore P45689 
Go to UniProtKB:  P45689
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP45689
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.52 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTCoot
MODEL REFINEMENTPHENIX

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research Council (BBSRC)United Kingdom--
Wellcome TrustUnited Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2023-08-23
    Type: Initial release
  • Version 1.1: 2023-09-20
    Changes: Database references, Derived calculations