1PNR

PURINE REPRESSOR-HYPOXANTHINE-PURF-OPERATOR COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of LacI member, PurR, bound to DNA: minor groove binding by alpha helices.

Schumacher, M.A.Choi, K.Y.Zalkin, H.Brennan, R.G.

(1994) Science 266: 763-770

  • Primary Citation of Related Structures:  2PUA, 2PUB, 2PUC, 2PUD

  • PubMed Abstract: 
  • The three-dimensional structure of a ternary complex of the purine repressor, PurR, bound to both its corepressor, hypoxanthine, and the 16-base pair purF operator site has been solved at 2.7 A resolution by x-ray crystallography. The bipartite struc ...

    The three-dimensional structure of a ternary complex of the purine repressor, PurR, bound to both its corepressor, hypoxanthine, and the 16-base pair purF operator site has been solved at 2.7 A resolution by x-ray crystallography. The bipartite structure of PurR consists of an amino-terminal DNA-binding domain and a larger carboxyl-terminal corepressor binding and dimerization domain that is similar to that of the bacterial periplasmic binding proteins. The DNA-binding domain contains a helix-turn-helix motif that makes base-specific contacts in the major groove of the DNA. Base contacts are also made by residues of symmetry-related alpha helices, the "hinge" helices, which bind deeply in the minor groove. Critical to hinge helix-minor groove binding is the intercalation of the side chains of Leu54 and its symmetry-related mate, Leu54', into the central CpG-base pair step. These residues thereby act as "leucine levers" to pry open the minor groove and kink the purF operator by 45 degrees.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Oregon Health Sciences University, Portland 97201-3098.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (PURINE REPRESSOR)
A
340Escherichia coli (strain K12)Gene Names: purR
Find proteins for P0ACP7 (Escherichia coli (strain K12))
Go to UniProtKB:  P0ACP7
Entity ID: 1
MoleculeChainsLengthOrganism
DNA (5'-D(*AP*AP*CP*GP*AP*AP*AP*AP*CP*GP*TP*TP*TP*TP*CP*GP*T )-3')B17N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HPA
Query on HPA

Download SDF File 
Download CCD File 
A
HYPOXANTHINE
C5 H4 N4 O
FDGQSTZJBFJUBT-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 175.850α = 90.00
b = 94.790β = 90.00
c = 81.840γ = 90.00
Software Package:
Software NamePurpose
TNTrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-11-20
    Type: Initial release
  • Version 1.1: 2008-05-22
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance