Carboxysome Shell protein, OrfA from H. Neapolitanus

Experimental Data Snapshot

  • Resolution: 2.15 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.187 

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This is version 1.3 of the entry. See complete history


Atomic-level models of the bacterial carboxysome shell.

Tanaka, S.Kerfeld, C.A.Sawaya, M.R.Cai, F.Heinhorst, S.Cannon, G.C.Yeates, T.O.

(2008) Science 319: 1083-1086

  • DOI: https://doi.org/10.1126/science.1151458
  • Primary Citation of Related Structures:  
    2QW7, 2RCF, 3BN4

  • PubMed Abstract: 

    The carboxysome is a bacterial microcompartment that functions as a simple organelle by sequestering enzymes involved in carbon fixation. The carboxysome shell is roughly 800 to 1400 angstroms in diameter and is assembled from several thousand protein subunits. Previous studies have revealed the three-dimensional structures of hexameric carboxysome shell proteins, which self-assemble into molecular layers that most likely constitute the facets of the polyhedral shell. Here, we report the three-dimensional structures of two proteins of previously unknown function, CcmL and OrfA (or CsoS4A), from the two known classes of carboxysomes, at resolutions of 2.4 and 2.15 angstroms. Both proteins assemble to form pentameric structures whose size and shape are compatible with formation of vertices in an icosahedral shell. Combining these pentamers with the hexamers previously elucidated gives two plausible, preliminary atomic models for the carboxysome shell.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California at Los Angeles (UCLA), Los Angeles, CA 90095, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Unidentified carboxysome polypeptide
A, B, C, D, E
91Halothiobacillus neapolitanusMutation(s): 0 
Gene Names: orfA
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
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.15 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.187 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.933α = 90
b = 86.78β = 90.22
c = 35.214γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
BOSdata collection

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-04-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description
  • Version 1.3: 2023-08-30
    Changes: Data collection, Database references, Derived calculations, Refinement description