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 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.3 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:  

  • 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 th ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN CBBX
A, B, C, D, E, F
289Rhodobacter sphaeroidesMutation(s): 0 
Gene Names: cbbX
Find proteins for P95648 (Rhodobacter sphaeroides)
Go to UniProtKB:  P95648
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
RUB
Query on RUB

Download SDF File 
Download CCD File 
A, B, C, D, E, F
RIBULOSE-1,5-DIPHOSPHATE
C5 H12 O11 P2
YAHZABJORDUQGO-NQXXGFSBSA-N
 Ligand Interaction
ADP
Query on ADP

Download SDF File 
Download CCD File 
A, B, C, D, E, F
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 21 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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