5W6J

Agrobacterium tumefaciens ADP-glucose pyrophosphorylase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural analysis reveals a pyruvate-binding activator site in theAgrobacterium tumefaciensADP-glucose pyrophosphorylase.

Hill, B.L.Mascarenhas, R.Patel, H.P.Asencion Diez, M.D.Wu, R.Iglesias, A.A.Liu, D.Ballicora, M.A.

(2018) J. Biol. Chem. --: --

  • DOI: 10.1074/jbc.RA118.004246
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The pathways for biosynthesis of glycogen in bacteria and starch in plants are evolutionarily and biochemically related. They are regulated primarily by ADP-glucose pyrophosphorylase, which evolved to satisfy metabolic requirements of a particular or ...

    The pathways for biosynthesis of glycogen in bacteria and starch in plants are evolutionarily and biochemically related. They are regulated primarily by ADP-glucose pyrophosphorylase, which evolved to satisfy metabolic requirements of a particular organism. Despite the importance of these two pathways, little is known about the mechanism that controls pyrophosphorylase activity or the location of its allosteric sites. Here, we report pyruvate-bound crystal structures of ADP-glucose pyrophosphorylase from the bacterium Agrobacterium tumefaciens, identifying a previously elusive activator site for the enzyme. We found that the tetrameric enzyme binds two molecules of pyruvate in a planar conformation. Each binding site is located in a crevice between the C-terminal domains of two subunits where they stack via a distinct β-helix region. Pyruvate interacts with the side chain of Lys-43 and with the peptide backbone of Ser-328 and Gly-329 from both subunits. These structural insights led to the design of two variants with altered regulatory properties. In one variant (K43A), the allosteric effect was absent, whereas in the other (G329D), the introduced Asp mimicked the presence of pyruvate. The latter generated an enzyme that was pre-activated and insensitive to further activation by pyruvate. Our study furnishes a deeper understanding of how glycogen biosynthesis is regulated in bacteria and the mechanism by which transgenic plants increased their starch production. These insights will facilitate rational approaches to enzyme engineering for starch production in crops of agricultural interest and will promote further study of allosteric signal transmission and molecular evolution in this important enzyme family.


    Organizational Affiliation

    Loyola University Chicago, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glucose-1-phosphate adenylyltransferase
A, B, C, D, E, H, I, J, K, L, N, O, P, Q, R, F, G, M, T, U
420Rhizobium radiobacterMutation(s): 0 
Gene Names: glgC
EC: 2.7.7.27
Find proteins for P39669 (Rhizobium radiobacter)
Go to UniProtKB:  P39669
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, T, U
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.200 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 93.439α = 72.04
b = 140.685β = 78.19
c = 228.490γ = 89.98
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-3000data scaling
PHENIXrefinement
HKL-3000data reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (United States)United StatesMCB1616851

Revision History 

  • Version 1.0: 2018-11-14
    Type: Initial release
  • Version 1.1: 2018-11-21
    Type: Data collection, Database references
  • Version 1.2: 2019-02-20
    Type: Author supporting evidence, Data collection