Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 48.00 kDa 
• Atom Count: 3329 
• Residue Count: 401 
• Unique protein chains: 1

1G6N

2.1 ANGSTROM STRUCTURE OF CAP-CAMP

• DOI: 10.2210/pdb1G6N/pdb
• Entry: 1G6N supersedes: 3GAP

• Classification: DNA BINDING PROTEIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2000-11-07 Released: 2000-12-15 
• Deposition Author(s): Passner, J.M., Schultz, S.C., Steitz, T.A.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Work: 0.207 
• R-Value Observed: 0.207 

Literature

Modeling the cAMP-induced allosteric transition using the crystal structure of CAP-cAMP at 2.1 A resolution.

Passner, J.M., Schultz, S.C., Steitz, T.A.

(2000) J Mol Biol 304: 847-859

• PubMed: 11124031 
• DOI: 10.1006/jmbi.2000.4231
• Primary Citation of Related Structures:  
  1G6N


• PubMed Abstract: 
  

After an allosteric transition produced by the binding of cyclic AMP (cAMP), the Escherichia coli catabolite gene activator protein (CAP) binds DNA specifically and activates transcription. The three-dimensional crystal structure of the CAP-cAMP complex has been refined at 2.1 A resolution, thus enabling a better evaluation of the structural basis for CAP phenotypes, the interactions of cAMP with CAP and the roles played by water structure. A review of mutational analysis of CAP together with the additional structural information presented here suggests a possible mechanism for the cAMP-induced allostery required for DNA binding and transcriptional activation. We hypothesize that cAMP binding may reorient the coiled-coil C-helices, which provide most of the dimer interface, thereby altering the relative positions of the DNA-binding domains of the CAP dimer. Additionally, cAMP binding may cause a further rearrangement of the DNA-binding and cAMP-binding domains of CAP via a flap consisting of beta-strands 4 and 5 which lies over the cAMP.

---

Related Citations: 

• Structure of a complex of catabolite gene activator protein and cyclic AMP at 2.5 A resolution
  Weber, I.T., Steitz, T.A.
  (1987) J Mol Biol 198: 311

---

Organizational Affiliation: 

Department of Molecular Biophysics and Biochemistry, Mount Sinai Schoolof Medicine, New York, NY 10029, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CATABOLITE GENE ACTIVATOR PROTEIN	A, B	210	Escherichia coli	Mutation(s): 0
Find proteins for P0ACJ8 (Escherichia coli (strain K12)) Explore P0ACJ8  Go to UniProtKB:  P0ACJ8

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CMP	A, B	ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE C10 H12 N5 O6 P IVOMOUWHDPKRLL-KQYNXXCUSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Work: 0.207 
• R-Value Observed: 0.207 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.8	α = 90
b = 95.6	β = 90
c = 105.5	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-11-07 
• Released Date: 2000-12-15 
Deposition Author(s): Passner, J.M., Schultz, S.C., Steitz, T.A.
• This entry supersedes: 3GAP

Revision History 

• Version 1.0: 2000-12-15
  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: 2017-10-04
  Changes: Refinement description