Biological Assembly 1  

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

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 61.29 kDa 
• Atom Count: 3870 
• Modelled Residue Count: 461 
• Deposited Residue Count: 530 
• Unique protein chains: 1

3CRA

Crystal Structure of Escherichia coli MazG, the Regulator of Nutritional Stress Response

• PDB DOI: 10.2210/pdb3CRA/pdb

• Classification: HYDROLASE
• Organism(s): Escherichia coli K-12
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2008-04-05 Released: 2008-04-22 
• Deposition Author(s): Lee, S., Kim, M.H., Kang, B.S., Kim, J.S., Kim, Y.G., Kim, K.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.284 
• R-Value Work: 0.226 
• R-Value Observed: 0.229 

Literature

Crystal structure of Escherichia coli MazG, the regulator of nutritional stress response.

Lee, S., Kim, M.H., Kang, B.S., Kim, J.S., Kim, G.H., Kim, Y.G., Kim, K.J.

(2008) J Biol Chem 283: 15232-15240

• PubMed: 18353782 
• DOI: 10.1074/jbc.M800479200
• Primary Citation of Related Structures:  
  3CRA, 3CRC


• PubMed Abstract: 
  

MazG is a nucleoside triphosphate pyrophosphohydrolase that hydrolyzes all canonical nucleoside triphosphates. The mazG gene located downstream from the chromosomal mazEF "addiction module," that mediated programmed cell death in Escherichia coli. MazG activity is inhibited by the MazEF complex both in vivo and in vitro. Enzymatic activity of MazG in vivo affects the cellular level of guanosine 3',5'-bispyrophosphate (ppGpp), synthesized by RelA under amino acid starvation. The reduction of ppGpp, caused by MazG, may extend the period of cell survival under nutritional stress. Here we describe the first crystal structure of active MazG from E. coli, which is composed of two similarly folded globular domains in tandem. Among the two putative catalytic domains, only the C-terminal domain has well ordered active sites and exhibits an NTPase activity. The MazG-ATP complex structure and subsequent mutagenesis studies explain the peculiar active site environment accommodating all eight canonical NTPs as substrates. In vivo nutrient starvation experiments show that the C terminus NTPase activity is responsible for the regulation of bacterial cell survival under nutritional stress.

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Organizational Affiliation: 

Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, Kyungbuk, Korea.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein mazG	A, B	265	Escherichia coli K-12	Mutation(s): 0  Gene Names: mazG, b2781, JW2752 EC: 3.6.1.8
UniProt
Find proteins for P0AEY3 (Escherichia coli (strain K12)) Explore P0AEY3  Go to UniProtKB:  P0AEY3

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.284 
• R-Value Work: 0.226 
• R-Value Observed: 0.229 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 62.789	α = 90
b = 67.568	β = 90
c = 140.425	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
ADSC	data collection
HKL-2000	data reduction
HKL-2000	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-04-05 
• Released Date: 2008-04-22 
Deposition Author(s): Lee, S., Kim, M.H., Kang, B.S., Kim, J.S., Kim, Y.G., Kim, K.J.

Revision History  

• Version 1.0: 2008-04-22
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance