1XGK

CRYSTAL STRUCTURE OF N12G AND A18G MUTANT NMRA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Modulation of the ligand binding properties of the transcription repressor NmrA by GATA-containing DNA and site-directed mutagenesis

Lamb, H.K.Ren, J.Park, A.Johnson, C.Leslie, K.Cocklin, S.Thompson, P.Mee, C.Cooper, A.Stammers, D.K.Hawkins, A.R.

(2004) Protein Sci 13: 3127-3138

  • DOI: 10.1110/ps.04958904
  • Primary Citation of Related Structures:  
    1XGK

  • PubMed Abstract: 
  • NmrA is a negative transcription-regulating protein that binds to the C-terminal region of the GATA transcription-activating protein AreA. The proposed molecular mechanism of action for NmrA is to inhibit AreA binding to its target promoters. In cont ...

    NmrA is a negative transcription-regulating protein that binds to the C-terminal region of the GATA transcription-activating protein AreA. The proposed molecular mechanism of action for NmrA is to inhibit AreA binding to its target promoters. In contrast to this proposal, we report that a C-terminal fragment of AreA can bind individually to GATA-containing DNA and NmrA and that in the presence of a mixture of GATA-containing DNA and NmrA, the AreA fragment binds preferentially to the GATA-containing DNA in vitro. These observations are consistent with NmrA acting by an indirect route, such as by controlling entry into the nucleus. Deletion of the final nine amino acids of a C-terminal fragment of AreA does not affect NmrA binding. Wild-type NmrA binds NAD(+)(P+) with much greater affinity than NAD(P)H, despite the lack of the consensus GXXGXXG dinucleotide-binding motif. However, introducing the GXXGXXG sequence into the NmrA double mutant N12G/A18G causes an approximately 13-fold increase in the KD for NAD+ and a 2.3-fold increase for NADP+. An H37W mutant in NmrA designed to increase the interaction with the adenine ring of NAD+ has a decrease in KD of approximately 4.5-fold for NAD+ and a marginal 24% increase for NADP+. The crystal structure of the N12G/A18G mutant protein shows changes in main chain position as well as repositioning of H37, which disrupts contacts with the adenine ring of NAD+, changes which are predicted to reduce the binding affinity for this dinucleotide. The substitutions E193Q/D195N or Q202E/F204Y in the C-terminal domain of NmrA reduced the affinity for a C-terminal fragment of AreA, implying that this region of the protein interacts with AreA.


    Related Citations: 
    • The Negative Transcriptional Regulator Nmra Discriminates between Oxidized and Reduced Dinucleotides
      Lamb, H.K., Leslie, K., Dodds, A.L., Nutley, M., Cooper, A., Johnson, C., Thompson, P., Stammers, D.K., Hawkins, A.R.
      (2003) J Biol Chem 278: 32107
    • The Structure of the Negative Transcriptional Regulator Nmra Reveals a Structural Superfamily which Includes the Short-Chain Dehydrogenase/Reductases
      Stammers, D.K., Ren, J., Leslie, K., Nichols, C.E., Lamb, H.K., Cocklin, S., Dodds, A., Hawkins, A.R.
      (2001) EMBO J 20: 6619
    • Expression, Purification and Crystallization of Aspergillus Nidulans Nmra, a Negative Regulatory Protein Involved in Nitrogen-Metabolite Repression
      Nichols, C.E., Cocklin, S., Dodds, A., Ren, J., Lamb, H., Hawkins, A.R., Stammers, D.K.
      (2001) Acta Crystallogr D Biol Crystallogr 57: 1722

    Organizational Affiliation

    School of Cell and Molecular Biosciences, University of Newcastle upon Tyne, Newcastle upon Tyne, NE2 4HH, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NITROGEN METABOLITE REPRESSION REGULATOR NMRAA352Aspergillus nidulansMutation(s): 2 
Gene Names: nmrA
Find proteins for Q5AU62 (Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139))
Explore Q5AU62 
Go to UniProtKB:  Q5AU62
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
K
Query on K

Download CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.61α = 90
b = 76.61β = 90
c = 103.82γ = 120
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-12-14
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance