1A7J

PHOSPHORIBULOKINASE FROM RHODOBACTER SPHEROIDES


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 

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This is version 1.2 of the entry. See complete history


Literature

The crystal structure of phosphoribulokinase from Rhodobacter sphaeroides reveals a fold similar to that of adenylate kinase.

Harrison, D.H.Runquist, J.A.Holub, A.Miziorko, H.M.

(1998) Biochemistry 37: 5074-5085

  • DOI: 10.1021/bi972805y
  • Primary Citation of Related Structures:  
    1A7J

  • PubMed Abstract: 
  • The essential photosynthetic enzyme phosphoribulokinase (PRK) is responsible for the conversion of ribulose 5-phosphate (Ru5P) to ribulose 1,5-bisphosphate, the substrate for the CO2 fixing enzyme ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco) ...

    The essential photosynthetic enzyme phosphoribulokinase (PRK) is responsible for the conversion of ribulose 5-phosphate (Ru5P) to ribulose 1,5-bisphosphate, the substrate for the CO2 fixing enzyme ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco). We have determined the structure of the octameric bacterial form of PRK to a resolution of 2.5 A. The protein is folded into a seven-member mixed beta-sheet surrounded by alpha-helices, giving the overall appearance of the nucleotide monophosphate family of kinases. Homology with the nucleotide monophosphate kinases suggests a number of amino acid residues that are likely to be important in catalysis and suggests the roles of some amino acid residues that have been mutated prior to the determination of the structure. Further, sequence identity across eukaryotic and prokaryotic species and a calculation of the buried surface area suggests the identity within the octamer of a dimer conserved throughout evolution. The width of the groove leading to the active site is consistent with an oriented molecule of thioredoxin controlling the oxidation state of two cysteines that regulate activity in the eukaryotic enzymes. Although neither Asp 42 nor Asp 169 can be definitively assigned as the catalytic base, the crystal structure suggests the location of a ribulose 5-phosphate binding site and suggests a role for several of the conserved basic residues.


    Related Citations: 
    • Functional Evaluation of Invariant Arginines Situated in the Mobile Lid Domain of Phosphoribulokinase
      Runquist, J.A., Harrison, D.H., Miziorko, H.M.
      (1998) Biochemistry 37: 1221

    Organizational Affiliation

    Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PHOSPHORIBULOKINASE A290Rhodobacter sphaeroidesMutation(s): 0 
Gene Names: prkA
EC: 2.7.1.19
Find proteins for P12033 (Rhodobacter sphaeroides)
Explore P12033 
Go to UniProtKB:  P12033
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 
  • Space Group: P 4 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.83α = 90
b = 129.83β = 90
c = 129.83γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-06-17
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance