Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 74.6 kDa 
• Atom Count: 5,202 
• Modelled Residue Count: 586 
• Deposited Residue Count: 586 
• Unique protein chains: 1
• Unique nucleic acid chains: 1

 1RAM

A NOVEL DNA RECOGNITION MODE BY NF-KB P65 HOMODIMER

• PDB DOI:  https://doi.org/10.2210/pdb1RAM/pdb
• NDB: PDR050

• Classification: TRANSCRIPTION/DNA
• Organism(s): Mus musculus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1997-11-22 Released: 1998-05-27 
• Deposition Author(s): Chen, Y.-Q., Ghosh, S., Ghosh, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.324 
• R-Value Work: 0.222 

Literature

A novel DNA recognition mode by the NF-kappa B p65 homodimer.

Chen, Y.Q., Ghosh, S., Ghosh, G.

(1998) Nat Struct Biol 5: 67-73

• PubMed: 9437432 
• DOI: https://doi.org/10.1038/nsb0198-67
• Primary Citation of Related Structures:  
  1RAM, 2RAM


• PubMed Abstract: 
  

The crystal structure of the NF-kappa B p65 (RelA) homodimer in complex with a DNA target has been determined to 2.4 A resolution. The two p65 subunits are not symmetrically disposed on the DNA target. The homodimer should optimally bind to a pseudo-palindromic nine base pair target with each subunit recognizing a 5'GGAA-3' half site separated by a central A-T base pair. However, one of the subunits (subunit B) encounters a half site of 5'-GAAA-3'. The single base-pair change from G-C to A-T results in highly unfavorable interactions between this half site and the base contacting protein residues in subunit B, which leads to an 18 degrees rotation of the N-terminal terminal domain from its normal conformation. Remarkably, subunit B retains all the interactions with the sugar phosphate backbone of the DNA target. This mode of interaction allows the NF-kappa B p65 homodimer to recognize DNA targets containing only one cognate half site. Differences in the sequence of the other half site provide variations in conformation and affinity of the complex.

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Organizational Affiliation: 

Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla 92093-0359, USA.

Macromolecules

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (TRANSCRIPTION FACTOR NF-KB P65)	C [auth A], D [auth B]	273	Mus musculus	Mutation(s): 0  Gene Names: Rela, Nfkb3
UniProt
Find proteins for Q04207 (Mus musculus) Explore Q04207  Go to UniProtKB:  Q04207

Entity ID: 1
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*CP*GP*GP*CP*TP*GP*GP*AP*AP*AP*TP*TP*TP*CP*CP*AP*GP*CP*CP*G)-3')	A [auth C], B [auth D]	20	N/A

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
DTT	E [auth A], F [auth B]	2,3-DIHYDROXY-1,4-DITHIOBUTANE C4 H10 O2 S2 VHJLVAABSRFDPM-IMJSIDKUSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.324 
• R-Value Work: 0.222 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 65.69	α = 90
b = 81.08	β = 90
c = 167.56	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-05-27 
Deposition Author(s): Chen, Y.-Q., Ghosh, S., Ghosh, G.

Revision History  

• Version 1.0: 1998-05-27
  Type: Initial release
  
• Version 1.1: 2008-05-22
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance