2ZFZ

Crystal structure of the C-terminal domain hexamer of ArgR from Mycobacterium tuberculosis in complex with arginine

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

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Literature

Structure of the C-terminal domain of the arginine repressor protein from Mycobacterium tuberculosis.

Cherney, L.T., Cherney, M.M., Garen, C.R., Lu, G.J., James, M.N.

(2008) Acta Crystallogr D Biol Crystallogr 64: 950-956

  • DOI: 10.1107/S0907444908021513
  • Primary Citation of Related Structures:  
    2ZFZ, 3BUE, 3CAG

  • PubMed Abstract: 

    • The Mycobacterium tuberculosis (Mtb) gene product encoded by open reading frame Rv1657 is an arginine repressor (ArgR). All genes involved in the L-arginine (hereafter arginine) biosynthetic pathway are essential for optimal growth of the Mtb pathogen, thus making MtbArgR a potential target for drug design ...

    The Mycobacterium tuberculosis (Mtb) gene product encoded by open reading frame Rv1657 is an arginine repressor (ArgR). All genes involved in the L-arginine (hereafter arginine) biosynthetic pathway are essential for optimal growth of the Mtb pathogen, thus making MtbArgR a potential target for drug design. The C-terminal domains of arginine repressors (CArgR) participate in oligomerization and arginine binding. Several crystal forms of CArgR from Mtb (MtbCArgR) have been obtained. The X-ray crystal structures of MtbCArgR were determined at 1.85 A resolution with bound arginine and at 2.15 A resolution in the unliganded form. These structures show that six molecules of MtbCArgR are arranged into a hexamer having approximate 32 point symmetry that is formed from two trimers. The trimers rotate relative to each other by about 11 degrees upon binding arginine. All residues in MtbCArgR deemed to be important for hexamer formation and for arginine binding have been identified from the experimentally determined structures presented. The hexamer contains six regular sites in which the arginine molecules have one common binding mode and three sites in which the arginine molecules have two overlapping binding modes. The latter sites only bind the ligand at high (200 mM) arginine concentrations.

    Organizational Affiliation: 

    Group in Protein Structure and Function, Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Arginine repressor
A, B, C, D, E, F
A, B, C, D, E, F
79Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: argR, ahrC, Rv1657, MT1695, MTCY06H11.22
UniProt
Find proteins for P9WPY9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WPY9 
Go to UniProtKB:  P9WPY9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WPY9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.673α = 90
b = 75.947β = 90
c = 107.099γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
Blu-Icedata collection
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-02-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.2: 2017-10-11
    Changes: Refinement description