3ZUH

Negative stain EM Map of the AAA protein CbbX, a red-type Rubisco activase from R. sphaeroides


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 21.0 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structure and Function of the Aaa+ Protein Cbbx, a Red-Type Rubisco Activase.

Mueller-Cajar, O.Stotz, M.Wendler, P.Hartl, F.U.Bracher, A.Hayer-Hartl, M.

(2011) Nature 479: 194

  • DOI: 10.1038/nature10568
  • Primary Citation of Related Structures:  
    3ZUH, 3SYK, 3SYL

  • PubMed Abstract: 
  • Ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) catalyses the fixation of atmospheric CO(2) in photosynthesis, but tends to form inactive complexes with its substrate ribulose 1,5-bisphosphate (RuBP). In plants, Rubisco is reactivated by the AAA(+) (ATPases associated with various cellular activities) protein Rubisco activase (Rca), but no such protein is known for the Rubisco of red algae ...

    Ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) catalyses the fixation of atmospheric CO(2) in photosynthesis, but tends to form inactive complexes with its substrate ribulose 1,5-bisphosphate (RuBP). In plants, Rubisco is reactivated by the AAA(+) (ATPases associated with various cellular activities) protein Rubisco activase (Rca), but no such protein is known for the Rubisco of red algae. Here we identify the protein CbbX as an activase of red-type Rubisco. The 3.0-Å crystal structure of unassembled CbbX from Rhodobacter sphaeroides revealed an AAA(+) protein architecture. Electron microscopy and biochemical analysis showed that ATP and RuBP must bind to convert CbbX into functionally active, hexameric rings. The CbbX ATPase is strongly stimulated by RuBP and Rubisco. Mutational analysis suggests that CbbX functions by transiently pulling the carboxy-terminal peptide of the Rubisco large subunit into the hexamer pore, resulting in the release of the inhibitory RuBP. Understanding Rubisco activation may facilitate efforts to improve CO(2) uptake and biomass production by photosynthetic organisms.


    Organizational Affiliation

    Department of Cellular Biochemistry, Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN CBBXA, B, C, D, E, F289Cereibacter sphaeroidesMutation(s): 0 
Gene Names: cbbX
UniProt
Find proteins for P95648 (Rhodobacter sphaeroides)
Explore P95648 
Go to UniProtKB:  P95648
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 21.0 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-11-09
    Type: Initial release
  • Version 1.1: 2011-11-30
    Changes: Database references
  • Version 1.2: 2014-08-27
    Changes: Other
  • Version 1.3: 2017-08-30
    Changes: Data collection
  • Version 1.4: 2019-10-23
    Changes: Data collection, Other