Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

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

Macromolecule Content

• Total Structure Weight: 52.11 kDa 
• Atom Count: 3817 
• Residue Count: 473 
• Unique protein chains: 1

1Q5X

Structure of OF RRAA (MENG), a protein inhibitor of RNA processing

• DOI: 10.2210/pdb1Q5X/pdb

• Classification: hydrolase inhibitor
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2003-08-11 Released: 2003-09-30 
• Deposition Author(s): Monzingo, A.F., Gao, J., Qiu, J., Georgiou, G., Robertus, J.D.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.274 
• R-Value Work: 0.226 
• R-Value Observed: 0.228 

Literature

The X-ray Structure of Escherichia coli RraA (MenG), A Protein Inhibitor of RNA Processing.

Monzingo, A.F., Gao, J., Qiu, J., Georgiou, G., Robertus, J.D.

(2003) J Mol Biol 332: 1015-1024

• PubMed: 14499605 
• DOI: 10.1016/s0022-2836(03)00970-7
• Primary Citation of Related Structures:  
  1Q5X


• PubMed Abstract: 
  

The Escherichia coli protein regulator of RNase E activity A (RraA) has recently been shown to act as a trans-acting modulator of RNA turnover in bacteria; it binds to the essential endonuclease RNase E and inhibits RNA processing in vivo and in vitro. Here, we report the 2.0A X-ray structure of RraA. The structure reveals a ring-like trimer with a central cavity of approximately 12A in diameter. Based on earlier sequence analysis, RraA had been identified as a putative S-adenosylmethionine:2-demethylmenaquinone and was annotated as MenG. However, an analysis of the RraA structure shows that the protein lacks the structural motifs usually required for methylases. Comparison of the observed fold with that of other proteins (and domains) suggests that the RraA fold is an ancient platform that has been adapted for a wide range of functions. An analysis of the amino acid sequence shows that the E.coli RraA exhibits an ancient relationship to a family of aldolases.

---

Related Citations: 

• RraA: a protein inhibitor of RNase E activity that globally modulates RNA abundance in E. coli.
  LEE, K., ZHAN, X., GAO, J., QIU, J., FANG, Y., MEGANATHAN, R., COHEN, S.N., GEORGIOU, G.
  (2003) Cell 114: 623

---

Organizational Affiliation: 

Institute for Cellular and Molecular Biology, 1 University Station, University of Texas at Austin, Austin, TX 78712, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
REGULATOR OF RNASE E ACTIVITY A	A, B, C	161	Escherichia coli	Mutation(s): 0  Gene Names: menG
Find proteins for P0A8R0 (Escherichia coli (strain K12)) Explore P0A8R0  Go to UniProtKB:  P0A8R0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.274 
• R-Value Work: 0.226 
• R-Value Observed: 0.228 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 94.454	α = 90
b = 93.945	β = 132.72
c = 67.949	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing
RESOLVE	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-08-11 
• Released Date: 2003-09-30 
Deposition Author(s): Monzingo, A.F., Gao, J., Qiu, J., Georgiou, G., Robertus, J.D.

Revision History 

• Version 1.0: 2003-09-30
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance