6UEW

Rubisco / CsoS2 N-peptide complex responsible for alpha-carboxysome cargo loading


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.189 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Multivalent interactions between CsoS2 and Rubisco mediate alpha-carboxysome formation.

Oltrogge, L.M.Chaijarasphong, T.Chen, A.W.Bolin, E.R.Marqusee, S.Savage, D.F.

(2020) Nat Struct Mol Biol 27: 281-287

  • DOI: https://doi.org/10.1038/s41594-020-0387-7
  • Primary Citation of Related Structures:  
    6UEW

  • PubMed Abstract: 

    Carboxysomes are bacterial microcompartments that function as the centerpiece of the bacterial CO 2 -concentrating mechanism by facilitating high CO 2 concentrations near the carboxylase Rubisco. The carboxysome self-assembles from thousands of individual proteins into icosahedral-like particles with a dense enzyme cargo encapsulated within a proteinaceous shell. In the case of the α-carboxysome, there is little molecular insight into protein-protein interactions that drive the assembly process. Here, studies on the α-carboxysome from Halothiobacillus neapolitanus demonstrate that Rubisco interacts with the N terminus of CsoS2, a multivalent, intrinsically disordered protein. X-ray structural analysis of the CsoS2 interaction motif bound to Rubisco reveals a series of conserved electrostatic interactions that are only made with properly assembled hexadecameric Rubisco. Although biophysical measurements indicate that this single interaction is weak, its implicit multivalency induces high-affinity binding through avidity. Taken together, our results indicate that CsoS2 acts as an interaction hub to condense Rubisco and enable efficient α-carboxysome formation.


  • Organizational Affiliation

    Department of Molecular and Cell Biology, University of California Berkeley, Berkeley, CA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribulose bisphosphate carboxylase large chain, CsoS2 N-peptide fusion
A, C, E, G
506Halothiobacillus neapolitanus c2Mutation(s): 0 
Gene Names: cbbLHneap_0922
EC: 4.1.1.39
UniProt
Find proteins for O85040 (Halothiobacillus neapolitanus (strain ATCC 23641 / c2))
Explore O85040 
Go to UniProtKB:  O85040
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO85040
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Ribulose bisphosphate carboxylase small chain
B, D, F, H
110Halothiobacillus neapolitanus c2Mutation(s): 0 
Gene Names: cbbSrbcSHneap_0921
EC: 4.1.1.39
UniProt
Find proteins for P45686 (Halothiobacillus neapolitanus (strain ATCC 23641 / c2))
Explore P45686 
Go to UniProtKB:  P45686
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP45686
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.189 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 171.831α = 90
b = 153.945β = 124.703
c = 108.063γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
Blu-Icedata collection
XDSdata reduction
Aimlessdata scaling
Cootmodel building
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM129241

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-30
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.2: 2020-03-18
    Changes: Database references
  • Version 1.3: 2020-03-25
    Changes: Database references
  • Version 1.4: 2023-10-11
    Changes: Data collection, Database references, Refinement description