8Q90

Halophilic Lrp transcription factor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Global Lrp regulator protein from Haloferax mediterranei: Transcriptional analysis and structural characterization.

Matarredona, L.Garcia-Bonete, M.J.Guio, J.Camacho, M.Fillat, M.F.Esclapez, J.Bonete, M.J.

(2024) Int J Biol Macromol 260: 129541-129541

  • DOI: https://doi.org/10.1016/j.ijbiomac.2024.129541
  • Primary Citation of Related Structures:  
    8Q90

  • PubMed Abstract: 

    Haloferax mediterranei, an extreme halophilic archaeon thriving in hypersaline environments, has acquired significant attention in biotechnological and biochemical research due to its remarkable ability to flourish in extreme salinity conditions. Transcription factors, essential in regulating diverse cellular processes, have become focal points in understanding its adaptability. This study delves into the role of the Lrp transcription factor, exploring its modulation of glnA, nasABC, and lrp gene promoters in vivo through β-galactosidase assays. Remarkably, our findings propose Lrp as the pioneering transcriptional regulator of nitrogen metabolism identified in a haloarchaeon. This study suggests its potential role in activating or repressing assimilatory pathway enzymes (GlnA and NasA). The interaction between Lrp and these promoters is analyzed using Electrophoretic Mobility Shift Assay and Differential Scanning Fluorimetry, highlighting l-glutamine's indispensable role in stabilizing the Lrp-DNA complex. Our research uncovers that halophilic Lrp forms octameric structures in the presence of l-glutamine. The study reveals the three-dimensional structure of the Lrp as a homodimer using X-ray crystallography, confirming this state in solution by Small-Angle X-ray Scattering. These findings illuminate the complex molecular mechanisms driving Hfx. mediterranei's nitrogen metabolism, offering valuable insights about its gene expression regulation and enriching our comprehension of extremophile biology.


  • Organizational Affiliation

    Departamento de Bioquímica y Biología Molecular y Edafología y Química Agrícola, Grupo Biotecnología de Extremófilos, Universidad de Alicante, San Vicente del Raspeig, Alicante, Spain.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
AsnC family transcriptional regulator
A, B
159Haloferax mediterraneiMutation(s): 0 
Gene Names: lrp
UniProt
Find proteins for I3R177 (Haloferax mediterranei (strain ATCC 33500 / DSM 1411 / JCM 8866 / NBRC 14739 / NCIMB 2177 / R-4))
Explore I3R177 
Go to UniProtKB:  I3R177
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupI3R177
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 32.36α = 90
b = 60β = 95.99
c = 87.39γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other governmentSpainVIGROB_016

Revision History  (Full details and data files)

  • Version 1.0: 2024-01-31
    Type: Initial release
  • Version 1.1: 2024-02-07
    Changes: Database references, Refinement description