Two-Component response regulator NarL/DNA Complex: DNA Bending Found in a High Affinity Site

Experimental Data Snapshot

  • Resolution: 2.12 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.228 

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Dimerization allows DNA target site recognition by the NarL response regulator.

Maris, A.E.Sawaya, M.R.Kaczor-Grzeskowiak, M.Jarvis, M.R.Bearson, S.M.Kopka, M.L.Schroder, I.Gunsalus, R.P.Dickerson, R.E.

(2002) Nat Struct Biol 9: 771-778

  • DOI: https://doi.org/10.1038/nsb845
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Two-component signal transduction systems are modular phosphorelay regulatory pathways common in prokaryotes. In the co-crystal structure of the Escherichia coli NarL signal output domain bound to DNA, we observe how the NarL family of two-component response regulators can bind DNA. DNA recognition is accompanied by the formation of a new dimerization interface, which could occur only in the full-length protein via a large intramolecular domain rearrangement. The DNA is recognized by the concerted effects of solvation, van der Waals forces and inherent DNA deformability, rather than determined primarily by major groove hydrogen bonding. These subtle forces permit a small DNA-binding domain to perturb the DNA helix, leading to major DNA curvature and a transition from B- to A-form DNA at the binding site, where valine on the recognition helix interacts unexpectedly with the polar major groove floor.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, Los Angeles, P.O. Box 951569, Los Angeles, California 90095-1569, USA.


Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Nitrate/Nitrite Response Regulator Protein NARLE [auth A],
F [auth B],
G [auth E],
H [auth F]
82Escherichia coliMutation(s): 3 
Find proteins for P0AF28 (Escherichia coli (strain K12))
Explore P0AF28 
Go to UniProtKB:  P0AF28
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AF28
Sequence Annotations
  • Reference Sequence

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Entity ID: 1
MoleculeChains LengthOrganismImage
B [auth D],
C [auth G],
D [auth H]
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.12 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.228 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.257α = 90
b = 52.741β = 90
c = 83.863γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
TRUNCATEdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2002-09-27
    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: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.4: 2023-11-15
    Changes: Data collection