2V6A

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 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: https://doi.org/10.1021/bi701063f
  • Primary Citation of Related Structures:  
    2V63, 2V67, 2V68, 2V69, 2V6A

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RIBULOSE BISPHOSPHATE CARBOXYLASE LARGE CHAIN
A, B, C, D, E
A, B, C, D, E, F, G, H
475Chlamydomonas reinhardtiiMutation(s): 2 
EC: 4.1.1.39
UniProt
Find proteins for P00877 (Chlamydomonas reinhardtii)
Explore P00877 
Go to UniProtKB:  P00877
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00877
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
RIBULOSE BISPHOSPHATE CARBOXYLASE SMALL CHAIN 1
I, J, K, L, M
I, J, K, L, M, N, O, P
140Chlamydomonas reinhardtiiMutation(s): 0 
EC: 4.1.1.39
UniProt
Find proteins for P00873 (Chlamydomonas reinhardtii)
Explore P00873 
Go to UniProtKB:  P00873
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00873
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CAP
Query on CAP

Download Ideal Coordinates CCD File 
AA [auth B]
CB [auth F]
HA [auth C]
KB [auth G]
PA [auth D]
AA [auth B],
CB [auth F],
HA [auth C],
KB [auth G],
PA [auth D],
R [auth A],
RB [auth H],
WA [auth E]
2-CARBOXYARABINITOL-1,5-DIPHOSPHATE
C6 H14 O13 P2
ITHCSGCUQDMYAI-ZMIZWQJLSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
AB [auth E]
AC [auth J]
BA [auth B]
BC [auth K]
CA [auth B]
AB [auth E],
AC [auth J],
BA [auth B],
BC [auth K],
CA [auth B],
CC [auth K],
DA [auth B],
DB [auth F],
DC [auth L],
EA [auth B],
EB [auth F],
EC [auth L],
FA [auth B],
FB [auth F],
FC [auth M],
GB [auth F],
GC [auth M],
HB [auth F],
HC [auth N],
IA [auth C],
IB [auth F],
IC [auth N],
JA [auth C],
JC [auth O],
KA [auth C],
KC [auth O],
LA [auth C],
LB [auth G],
LC [auth P],
MA [auth C],
MB [auth G],
MC [auth P],
NA [auth C],
NB [auth G],
OB [auth G],
PB [auth G],
QA [auth D],
RA [auth D],
S [auth A],
SA [auth D],
SB [auth H],
T [auth A],
TA [auth D],
TB [auth H],
U [auth A],
UA [auth D],
UB [auth H],
V [auth A],
VB [auth H],
W [auth A],
WB [auth H],
X [auth A],
XA [auth E],
XB [auth I],
Y [auth A],
YA [auth E],
YB [auth I],
ZA [auth E],
ZB [auth J]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
BB [auth F]
GA [auth C]
JB [auth G]
OA [auth D]
Q [auth A]
BB [auth F],
GA [auth C],
JB [auth G],
OA [auth D],
Q [auth A],
QB [auth H],
VA [auth E],
Z [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Modified Residues  4 Unique
IDChains TypeFormula2D DiagramParent
HYP
Query on HYP
A, B, C, D, E
A, B, C, D, E, F, G, H
L-PEPTIDE LINKINGC5 H9 N O3PRO
KCX
Query on KCX
A, B, C, D, E
A, B, C, D, E, F, G, H
L-PEPTIDE LINKINGC7 H14 N2 O4LYS
SMC
Query on SMC
A, B, C, D, E
A, B, C, D, E, F, G, H
L-PEPTIDE LINKINGC4 H9 N O2 SCYS
MME
Query on MME
I, J, K, L, M
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: 1.50 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.906α = 90
b = 196.629β = 90
c = 201.95γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-07-31
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description