Biological Assembly 1  

 3D View: Structure | Electron Density

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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: 48001.41 
• Atom Count: 3156 
• Residue Count: 420 
• Unique protein chains: 1

4N9H

Crystal structure of Transcription regulation Protein CRP

• DOI: 10.2210/pdb4N9H/pdb

• Classification: TRANSCRIPTION REGULATOR
• Organism(s): Escherichia coli
• Expression System: Escherichia coli


• Deposited: 2013-10-21 Released: 2014-07-09 
• Deposition Author(s): Lee, B.J., Seok, S.H., Im, H., Yoon, H.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.263 
• R-Value Work: 0.202 

Literature

Structures of inactive CRP species reveal the atomic details of the allosteric transition that discriminates cyclic nucleotide second messengers.

Seok, S.H., Im, H., Won, H.S., Seo, M.D., Lee, Y.S., Yoon, H.J., Cha, M.J., Park, J.Y., Lee, B.J.

(2014) Acta Crystallogr.,Sect.D 70: 1726-1742

• PubMed: 24914983 
• DOI: 10.1107/S139900471400724X
• Primary Citation of Related Structures:  
  4N9I


• PubMed Abstract: 
  

The prokaryotic global transcription factor CRP has been considered to be an ideal model for in-depth study of both the allostery of the protein and the differential utilization of the homologous cyclic nucleotide second messengers cAMP and cGMP. Here, atomic details from the crystal structures of two inactive CRP species, an apo form and a cGMP-bound form, in comparison with a known active conformation, the cAMP-CRP complex, provide macroscopic and microscopic insights into CRP allostery, which is coupled to specific discrimination between the two effectors. The cAMP-induced conformational transition, including dynamic fluctuations, can be driven by the fundamental folding forces that cause water-soluble globular proteins to construct an optimized hydrophobic core, including secondary-structure formation. The observed conformational asymmetries underlie a negative cooperativity in the sequential binding of cyclic nucleotides and a stepwise manner of binding with discrimination between the effector molecules. Additionally, the finding that cGMP, which is specifically recognized in a syn conformation, induces an inhibitory conformational change, rather than a null effect, on CRP supports the intriguing possibility that cGMP signalling could be widely utilized in prokaryotes, including in aggressive inhibition of CRP-like proteins.

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Organizational Affiliation: 

Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Catabolite gene activator	A, B	210	Escherichia coli	Mutation(s): 0  Gene Names: crp
Find proteins for C3SQJ7 (Escherichia coli) Go to UniProtKB:  C3SQJ7

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A, B	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.263 
• R-Value Work: 0.202 
• Space Group: P 6₁

Unit Cell:

Length (Å)	Angle (°)
a = 120.617	α = 90.00
b = 120.617	β = 90.00
c = 60.349	γ = 120.00

Software Package:

Software Name	Purpose
HKL-2000	data scaling
PHENIX	model building
PHENIX	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data collection

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-10-21 
• Released Date: 2014-07-09 
• Deposition Author(s): Lee, B.J., Seok, S.H., Im, H., Yoon, H.J.

Revision History 

• Version 1.0: 2014-07-09
  Type: Initial release