2WVW image
Deposition Date 2009-10-20
Release Date 2010-01-19
Last Version Date 2024-11-13
Entry Detail
PDB ID:
2WVW
Keywords:
Title:
Cryo-EM structure of the RbcL-RbcX complex
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
9.00 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:RIBULOSE BISPHOSPHATE CARBOXYLASE LARGE CHAIN
Gene (Uniprot):cbbL
Chain IDs:A, B, C, D, E, F, G, H
Chain Length:472
Number of Molecules:8
Biological Source:SYNECHOCOCCUS ELONGATUS
Polymer Type:polypeptide(L)
Molecule:RBCX PROTEIN
Gene (Uniprot):rbcX
Chain IDs:I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X
Chain Length:155
Number of Molecules:16
Biological Source:ANABAENA SP. CA
Ligand Molecules
Primary Citation
Coupled Chaperone Action in Folding and Assembly of Hexadecameric Rubisco
Nature 463 197 ? (2010)
PMID: 20075914 DOI: 10.1038/NATURE08651

Abstact

Form I Rubisco (ribulose 1,5-bisphosphate carboxylase/oxygenase), a complex of eight large (RbcL) and eight small (RbcS) subunits, catalyses the fixation of atmospheric CO(2) in photosynthesis. The limited catalytic efficiency of Rubisco has sparked extensive efforts to re-engineer the enzyme with the goal of enhancing agricultural productivity. To facilitate such efforts we analysed the formation of cyanobacterial form I Rubisco by in vitro reconstitution and cryo-electron microscopy. We show that RbcL subunit folding by the GroEL/GroES chaperonin is tightly coupled with assembly mediated by the chaperone RbcX(2). RbcL monomers remain partially unstable and retain high affinity for GroEL until captured by RbcX(2). As revealed by the structure of a RbcL(8)-(RbcX(2))(8) assembly intermediate, RbcX(2) acts as a molecular staple in stabilizing the RbcL subunits as dimers and facilitates RbcL(8) core assembly. Finally, addition of RbcS results in RbcX(2) release and holoenzyme formation. Specific assembly chaperones may be required more generally in the formation of complex oligomeric structures when folding is closely coupled to assembly.

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Primary Citation of related structures