3WG9

Crystal structure of RSP, a Rex-family repressor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Distinct structural features of Rex-family repressors to sense redox levels in anaerobes and aerobes.

Zheng, Y.Ko, T.-P.Sun, H.Huang, C.-H.Pei, J.Qiu, R.Wang, A.H.-J.Wiegel, J.Shao, W.Guo, R.-T.

(2014) J Struct Biol 188: 195-204

  • DOI: 10.1016/j.jsb.2014.11.001
  • Primary Citation of Related Structures:  
    3WG9, 3WGH, 3WGI

  • PubMed Abstract: 
  • The Rex-family repressors sense redox levels by alternative binding to NADH or NAD(+). Unlike other Rex proteins that regulate aerobic respiration, RSP controls ethanol fermentation in the obligate anaerobe Thermoanaerobacter ethanolicus JW200(T). It ...

    The Rex-family repressors sense redox levels by alternative binding to NADH or NAD(+). Unlike other Rex proteins that regulate aerobic respiration, RSP controls ethanol fermentation in the obligate anaerobe Thermoanaerobacter ethanolicus JW200(T). It is also found in other anaerobic microorganisms. Here we present the crystal structures of apo-RSP, RSP/NADH and RSP/NAD(+)/DNA, which are the first structures of Rex-family members from an obligate anaerobe. RSP functions as a homodimer. It assumes an open conformation when bound to the operator DNA and a closed conformation when not DNA-bound. The DNA binds to the N-terminal winged-helix domain and the dinucleotide, either reduced or oxidized, binds to the C-terminal Rossmann-fold domain. The two distinct orientations of nicotinamide ring, anti in NADH and syn in NAD(+), give rise to two sets of protein-ligand interactions. Consequently, NADH binding makes RSP into a closed conformation, which does not bind to DNA. Both the conserved residues and the DNA specificity of RSP show a number of variations from those of the aerobic Rex, reflecting different structural bases for redox-sensing by the anaerobic and aerobic Rex-family members.


    Organizational Affiliation

    Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China. Electronic address: guo_rt@tib.cas.cn.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Redox-sensing transcriptional repressor rexABCD224Thermoanaerobacter ethanolicus JW 200Mutation(s): 0 
Gene Names: rexrsp
Find proteins for D5KM69 (Thermoanaerobacter ethanolicus JW 200)
Explore D5KM69 
Go to UniProtKB:  D5KM69
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download CCD File 
A, C, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.201 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.412α = 90
b = 90.098β = 90
c = 171.637γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
CNSphasing
REFMACrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-08-13
    Type: Initial release
  • Version 1.1: 2019-12-25
    Changes: Database references