ISDA

Entry Detail

PDB ID:

3RG6

Keywords:

PHOTOSYNTHESIS

Title:

Crystal structure of a chaperone-bound assembly intermediate of form I Rubisco

Biological Source:

Source Organism:

Synechococcus elongatus, Anabaena sp.

Host Organism:

Escherichia coli

PDB Version:

Deposition Date:

2011-04-07

Release Date:

2011-07-20

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

3.20 Å

R-Value Free:

0.24

R-Value Work:

0.21

R-Value Observed:

0.21

Space Group:

I 4

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Ribulose bisphosphate carboxylase large chain
Chain IDs:A, D (auth: B)
Chain Length:472
Number of Molecules:2
Biological Source:Synechococcus elongatus

UniProt ID:P00880 Pfam ID:PF02788, PF00016

Protein Blast

Polymer Type:polypeptide(L)
Description:RbcX protein
Chain IDs:B (auth: C), C (auth: D), E, F
Chain Length:155
Number of Molecules:4
Biological Source:Anabaena sp.

UniProt ID:Q44212 Pfam ID:PF02341

Ligand Molecules

Primary Citation

Crystal structure of a chaperone-bound assembly intermediate of form I Rubisco.

Bracher, A, Starling-Windhof, A, Hartl, F.U, Hayer-Hartl, M, Liu, C, Young, A.L, Starling-Windhof, A, Bracher, A, Saschenbrecker, S, Rao, B.V, Rao, K.V, Berninghausen, O, Mielke, T, Hartl, F.U, Beckmann, R, Hayer-Hartl, M, Saschenbrecker, S, Bracher, A, Rao, K.V, Rao, B.V, Hartl, F.U, Hayer-Hartl, M, Newman, J, Branden, C.I, Jones, T.A.Show

Nat.Struct.Mol.Biol. 18 875 880 (2011)

PMID: 21765418 DOI: 10.1038/nsmb.2090

Abstact

The form I Rubisco of autotrophic bacteria, algae and plants is a complex of eight large (RbcL) and eight small (RbcS) subunits. It fixes atmospheric CO(2) in the dark reaction of photosynthesis. As shown for the cyanobacterial enzyme, folding of the RbcL subunits is mediated by the GroEL-GroES chaperonin system, and assembly requires the specialized chaperone RbcX, a homodimer of ~15-kDa subunits. Here we present the 3.2-Å crystal structure of a Rubisco assembly intermediate, consisting of the RbcL(8) core with eight RbcX(2) molecules bound. The structure reveals the molecular mechanism by which RbcX(2) mediates oligomeric assembly. Specifically, RbcX(2) provides positional information for proper formation of antiparallel RbcL dimers, thereby preventing RbcL-RbcL misalignment and off-pathway aggregation. The RbcL(8)(RbcX(2))(8) structure also suggests that RbcS functions by stabilizing the '60s loop' of RbcL in the catalytically active conformation.

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Primary Citation of related structures