2V6A

Crystal structure of Chlamydomonas reinhardtii Rubisco with large- subunit mutations V331A, G344S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Analysis of Altered Large-Subunit Loop-6-Carboxy-Terminus Interactions that Influence Catalytic Efficiency and Co2-O2 Specificity of Ribulose-1,5-Bisphosphate Carboxylase Oxygenase

Karkehabadi, S.Satagopan, S.Taylor, T.C.Spreitzer, R.J.Andersson, I.

(2007) Biochemistry 46: 11080

  • DOI: 10.1021/bi701063f
  • Primary Citation of Related Structures:  2V63, 2V67, 2V68, 2V69

  • PubMed Abstract: 
  • The loop between alpha-helix 6 and beta-strand 6 in the alpha/beta-barrel of ribulose-1,5-bisphosphate carboxylase/oxygenase plays a key role in discriminating between CO2 and O2. Genetic screening in Chlamydomonas reinhardtii previously identified a ...

    The loop between alpha-helix 6 and beta-strand 6 in the alpha/beta-barrel of ribulose-1,5-bisphosphate carboxylase/oxygenase plays a key role in discriminating between CO2 and O2. Genetic screening in Chlamydomonas reinhardtii previously identified a loop-6 V331A substitution that decreases carboxylation and CO2/O2 specificity. Revertant selection identified T342I and G344S substitutions that restore photosynthetic growth by increasing carboxylation and specificity of the V331A enzyme. In numerous X-ray crystal structures, loop 6 is closed or open depending on the activation state of the enzyme and the presence or absence of ligands. The carboxy terminus folds over loop 6 in the closed state. To study the molecular basis for catalysis, directed mutagenesis and chloroplast transformation were used to create T342I and G344S substitutions alone. X-ray crystal structures were then solved for the V331A, V331A/T342I, T342I, and V331A/G344S enzymes, as well as for a D473E enzyme created to assess the role of the carboxy terminus in loop-6 closure. V331A disturbs a hydrophobic pocket, abolishing several van der Waals interactions. These changes are complemented by T342I and G344S, both of which alone cause decreases in CO2/O2 specificity. In the V331A/T342I revertant enzyme, Arg339 main-chain atoms are displaced. In V331A/G344S, alpha-helix 6 is shifted. D473E causes disorder of the carboxy terminus, but loop 6 remains closed. Interactions between a transition-state analogue and several residues are altered in the mutant enzymes. However, active-site Lys334 at the apex of loop 6 has a normal conformation. A variety of subtle interactions must be responsible for catalytic efficiency and CO2/O2 specificity.


    Organizational Affiliation

    Department of Molecular Biology, Swedish University of Agricultural Sciences, BMC Box 590, 751 24 Uppsala, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RIBULOSE BISPHOSPHATE CARBOXYLASE LARGE CHAIN
A, B, C, D, E, F, G, H
475Chlamydomonas reinhardtiiGene Names: rbcL
EC: 4.1.1.39
Find proteins for P00877 (Chlamydomonas reinhardtii)
Go to UniProtKB:  P00877
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
RIBULOSE BISPHOSPHATE CARBOXYLASE SMALL CHAIN 1
I, J, K, L, M, N, O, P
140Chlamydomonas reinhardtiiGene Names: RBCS-1
EC: 4.1.1.39
Find proteins for P00873 (Chlamydomonas reinhardtii)
Go to UniProtKB:  P00873
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
CAP
Query on CAP

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H
2-CARBOXYARABINITOL-1,5-DIPHOSPHATE
C6 H14 O13 P2
ITHCSGCUQDMYAI-ZMIZWQJLSA-N
 Ligand Interaction
Modified Residues  4 Unique
IDChainsTypeFormula2D DiagramParent
KCX
Query on KCX
A, B, C, D, E, F, G, H
L-PEPTIDE LINKINGC7 H14 N2 O4LYS
SMC
Query on SMC
A, B, C, D, E, F, G, H
L-PEPTIDE LINKINGC4 H9 N O2 SCYS
HYP
Query on HYP
A, B, C, D, E, F, G, H
L-PEPTIDE LINKINGC5 H9 N O3PRO
MME
Query on MME
I, J, K, L, M, N, O, P
L-PEPTIDE LINKINGC6 H13 N O2 SMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 129.906α = 90.00
b = 196.629β = 90.00
c = 201.950γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SCALEPACKdata scaling
MOLREPphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-07-31
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance