Crystal structure of Nmra, a negative transcriptional regulator (Trigonal form)

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.209 

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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: 6619-6626

  • DOI: https://doi.org/10.1093/emboj/20.23.6619
  • Primary Citation of Related Structures:  
    1K6I, 1K6J, 1K6X

  • PubMed Abstract: 

    NmrA is a negative transcriptional regulator involved in the post-translational modulation of the GATA-type transcription factor AreA, forming part of a system controlling nitrogen metabolite repression in various fungi. X-ray structures of two NmrA crystal forms, both to 1.8 A resolution, show NmrA consists of two domains, including a Rossmann fold. NmrA shows an unexpected similarity to the short-chain dehydrogenase/reductase (SDR) family, with the closest relationship to UDP-galactose 4-epimerase. We show that NAD binds to NmrA, a previously unreported nucleotide binding property for this protein. NmrA is unlikely to be an active dehydrogenase, however, as the conserved catalytic tyrosine in SDRs is absent in NmrA, and thus the nucleotide binding to NmrA could have a regulatory function. Our results suggest that other transcription factors possess the SDR fold with functions including RNA binding. The SDR fold appears to have been adapted for other roles including non-enzymatic control functions such as transcriptional regulation and is likely to be more widespread than previously recognized.

  • Organizational Affiliation

    Structural Biology Division, The Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, Oxford, UK. daves@strubi.ox.ac.uk

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NmrA352Aspergillus nidulansMutation(s): 0 
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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5AU62
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.209 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.8α = 90
b = 76.8β = 90
c = 104.9γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-12-05
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-07
    Changes: Data collection, Database references, Derived calculations