1JTY

Crystal structure of the multidrug binding transcriptional regulator QacR bound to ethidium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.97 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.239 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Structural mechanisms of QacR induction and multidrug recognition.

Schumacher, M.A.Miller, M.C.Grkovic, S.Brown, M.H.Skurray, R.A.Brennan, R.G.

(2001) Science 294: 2158-2163

  • DOI: https://doi.org/10.1126/science.1066020
  • Primary Citation of Related Structures:  
    1JT6, 1JTX, 1JTY, 1JUM, 1JUP, 1JUS

  • PubMed Abstract: 

    The Staphylococcus aureus multidrug binding protein QacR represses transcription of the qacA multidrug transporter gene and is induced by structurally diverse cationic lipophilic drugs. Here, we report the crystal structures of six QacR-drug complexes. Compared to the DNA bound structure, drug binding elicits a coil-to-helix transition that causes induction and creates an expansive multidrug-binding pocket, containing four glutamates and multiple aromatic and polar residues. These structures indicate the presence of separate but linked drug-binding sites within a single protein. This multisite drug-binding mechanism is consonant with studies on multidrug resistance transporters.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Oregon Health & Science University, Portland, OR 97201, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HYPOTHETICAL TRANSCRIPTIONAL REGULATOR IN QACA 5'REGIONA [auth B],
B [auth D],
C [auth A],
D [auth E]
194Staphylococcus aureusMutation(s): 2 
UniProt
Find proteins for P0A0N4 (Staphylococcus aureus)
Explore P0A0N4 
Go to UniProtKB:  P0A0N4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A0N4
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ET
Query on ET

Download Ideal Coordinates CCD File 
J [auth A]ETHIDIUM
C21 H20 N3
QTANTQQOYSUMLC-UHFFFAOYSA-O
SO4
Query on SO4

Download Ideal Coordinates CCD File 
E [auth B]
F [auth B]
G [auth B]
H [auth D]
I [auth D]
E [auth B],
F [auth B],
G [auth B],
H [auth D],
I [auth D],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth E],
S [auth E],
T [auth E],
U [auth E],
V [auth E]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.97 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.239 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 172α = 90
b = 172β = 90
c = 95γ = 90
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
CCP4data scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-12-12
    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: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-16
    Changes: Data collection, Refinement description