Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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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: 48003.29 
• Atom Count: 3214 
• Residue Count: 420 
• 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 (strain K12)
• Expression System: Escherichia coli


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

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.1 Å
• R-Value Work: 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


• 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.

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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




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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

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

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.1 Å
• R-Value Work: 0.207 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 46.800	α = 90.00
b = 95.600	β = 90.00
c = 105.500	γ = 90.00

Software Package:

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

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
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2017-10-04
  Type: Refinement description