3CRA

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


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 

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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

  • 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. Ma ...

    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.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein mazGAB265Escherichia coli K-12Mutation(s): 0 
Gene Names: mazGb2781JW2752
EC: 3.6.1.8
Find proteins for P0AEY3 (Escherichia coli (strain K12))
Explore P0AEY3 
Go to UniProtKB:  P0AEY3
Protein Feature View
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  • Reference Sequence
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 = 62.789α = 90
b = 67.568β = 90
c = 140.425γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling
SOLVEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

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