Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C4  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C4  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 308.05 kDa 
• Atom Count: 21516 
• Modelled Residue Count: 2548 
• Deposited Residue Count: 2808 
• Unique protein chains: 1

2BZN

Crystal structure of human guanosine monophosphate reductase 2 GMPR2 in complex with IMP

• PDB DOI: 10.2210/pdb2BZN/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2005-08-19 Released: 2005-09-02 
• Deposition Author(s): Stenmark, P., Kursula, P., Arrowsmith, C., Berglund, H., Edwards, A., Ehn, M., Graslund, S., Hammarstrom, M., Hallberg, B.M., Kotenyova, T., Nilsson-Ehle, P., Nordlund, P., Ogg, D., Persson, C., Sagemark, J., Schuler, H., Sundstrom, M., Thorsell, A., Weigelt, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.210 
• R-Value Work: 0.158 
• R-Value Observed: 0.161 

Literature

Cofactor Mobility Determines Reaction Outcome in the Impdh and Gmpr (Beta-Alpha)(8) Barrel Enzymes.

Patton, G.C., Stenmark, P., Gollapalli, D.R., Sevastik, R., Kursula, P., Flodin, S., Schuler, H., Swales, C.T., Eklund, H., Himo, F., Nordlund, P., Hedstrom, L.

(2011) Nat Chem Biol 7: 950

• PubMed: 22037469 
• DOI: 10.1038/nchembio.693
• Primary Citation of Related Structures:  
  2BZN, 2C6Q


• PubMed Abstract: 
  

Inosine monophosphate dehydrogenase (IMPDH) and guanosine monophosphate reductase (GMPR) belong to the same structural family, share a common set of catalytic residues and bind the same ligands. The structural and mechanistic features that determine reaction outcome in the IMPDH and GMPR family have not been identified. Here we show that the GMPR reaction uses the same intermediate E-XMP* as IMPDH, but in this reaction the intermediate reacts with ammonia instead of water. A single crystal structure of human GMPR type 2 with IMP and NADPH fortuitously captures three different states, each of which mimics a distinct step in the catalytic cycle of GMPR. The cofactor is found in two conformations: an 'in' conformation poised for hydride transfer and an 'out' conformation in which the cofactor is 6 Å from IMP. Mutagenesis along with substrate and cofactor analog experiments demonstrate that the out conformation is required for the deamination of GMP. Remarkably, the cofactor is part of the catalytic machinery that activates ammonia.

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Organizational Affiliation: 

Department of Biology, Brandeis University, Waltham, Massachusetts, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
GMP REDUCTASE 2	A, B, C, D, E, F, G, H	351	Homo sapiens	Mutation(s): 0  Gene Names: GMPR2 EC: 1.7.1.7
UniProt & NIH Common Fund Data Resources
Find proteins for Q9P2T1 (Homo sapiens) Explore Q9P2T1  Go to UniProtKB:  Q9P2T1
PHAROS:  Q9P2T1 GTEx:  ENSG00000100938

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IMP	I [auth A], J [auth B], K [auth C], L [auth D], M [auth E], N [auth F], O [auth G], P [auth H]	INOSINIC ACID C10 H13 N4 O8 P GRSZFWQUAKGDAV-KQYNXXCUSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.210 
• R-Value Work: 0.158 
• R-Value Observed: 0.161 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 131.291	α = 90
b = 141.35	β = 90
c = 164.895	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-08-19 
• Released Date: 2005-09-02 
Deposition Author(s): Stenmark, P., Kursula, P., Arrowsmith, C., Berglund, H., Edwards, A., Ehn, M., Graslund, S., Hammarstrom, M., Hallberg, B.M., Kotenyova, T., Nilsson-Ehle, P., Nordlund, P., Ogg, D., Persson, C., Sagemark, J., Schuler, H., Sundstrom, M., Thorsell, A., Weigelt, J.

Revision History  

• Version 1.0: 2005-09-02
  Type: Initial release
  
• Version 1.1: 2011-11-30
  Changes: Database references, Derived calculations, Non-polymer description, Other, Version format compliance