4W5W image
Entry Detail
PDB ID:
4W5W
Keywords:
Title:
Rubisco activase from Arabidopsis thaliana
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2014-08-19
Release Date:
2015-04-08
Method Details:
Experimental Method:
Resolution:
2.90 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 65
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Ribulose bisphosphate carboxylase/oxygenase activase, chloroplastic
Chain IDs:A
Chain Length:391
Number of Molecules:1
Biological Source:Arabidopsis thaliana
Ligand Molecules
Primary Citation
Structure of Arabidopsis thaliana Rubisco activase
Acta Crystallogr.,Sect.D 71 800 808 (2015)
PMID: 25849391 DOI: 10.1107/S1399004715001182

Abstact

The CO2-fixing enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) is inactivated by the formation of dead-end complexes with inhibitory sugar phosphates. In plants and green algae, the ATP-dependent motor protein Rubisco activase restores catalytic competence by facilitating conformational changes in Rubisco that promote the release of the inhibitory compounds from the active site. Here, the crystal structure of Rubisco activase from Arabidopsis thaliana is presented at 2.9 Å resolution. The structure reveals an AAA+ two-domain structure. More than 100 residues in the protein were not visible in the electron-density map owing to conformational disorder, but were verified to be present in the crystal by mass spectrometry. Two sulfate ions were found in the structure. One was bound in the loop formed by the Walker A motif at the interface of the domains. A second sulfate ion was bound at the N-terminal end of the first helix of the C-terminal domain. The protein packs in a helical fashion in the crystal, as observed previously for Rubisco activase, but differences in the helical pitch indicate flexibility in the packing of the protein.

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Primary Citation of related structures