1EGA

CRYSTAL STRUCTURE OF A WIDELY CONSERVED GTPASE ERA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.243 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of ERA: a GTPase-dependent cell cycle regulator containing an RNA binding motif.

Chen, X.Court, D.L.Ji, X.

(1999) Proc.Natl.Acad.Sci.USA 96: 8396-8401

  • Also Cited By: 1X18, 1X1L, 3R9W

  • PubMed Abstract: 
  • ERA forms a unique family of GTPase. It is widely conserved and essential in bacteria. ERA functions in cell cycle control by coupling cell division with growth rate. ERA homologues also are found in eukaryotes. Here we report the crystal structure o ...

    ERA forms a unique family of GTPase. It is widely conserved and essential in bacteria. ERA functions in cell cycle control by coupling cell division with growth rate. ERA homologues also are found in eukaryotes. Here we report the crystal structure of ERA from Escherichia coli. The structure has been determined at 2.4-A resolution. It reveals a two-domain arrangement of the molecule: an N-terminal domain that resembles p21 Ras and a C-terminal domain that is unique. Structure-based topological search of the C domain fails to reveal any meaningful match, although sequence analysis suggests that it contains a KH domain. KH domains are RNA binding motifs that usually occur in tandem repeats and exhibit low sequence similarity except for the well-conserved segment VIGxxGxxIK. We have identified a betaalphaalphabeta fold that contains the VIGxxGxxIK sequence and is shared by the C domain of ERA and the KH domain. We propose that this betaalphaalphabeta fold is the RNA binding motif, the minimum structural requirement for RNA binding. ERA dimerizes in crystal. The dimer formation involves a significantly distorted switch II region, which may shed light on how ERA protein regulates downstream events.


    Related Citations: 
    • Cell Cycle Arrest in Era GTPase Mutants: A Potential Growth Rate-Regulated Checkpoint in E. Coli
      Britton, R.A.,Powell, B.S.,Dasgupta, S.,Sun, Q.,Margolin, W.,Lupski, J.R.,Court, D.L.
      (1998) Mol.Microbiol. 27: 739


    Organizational Affiliation

    Biomolecular Structure Group, Advanced BioScience Laboratories-Basic Research Program, National Cancer Institute-Frederick Cancer Research and Development Center, P.O. Box B, Frederick, MD 21702, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (GTP-BINDING PROTEIN ERA)
A, B
301Escherichia coli (strain K12)Gene Names: era (rbaA, sdgE)
Find proteins for P06616 (Escherichia coli (strain K12))
Go to UniProtKB:  P06616
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.243 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 86.790α = 90.00
b = 67.560β = 115.82
c = 87.290γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
HKL-2000data scaling
SHARPphasing
PHASESphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1998-12-01 
  • Released Date: 1999-07-12 
  • Deposition Author(s): Chen, X., Ji, X.

Revision History 

  • Version 1.0: 1999-07-12
    Type: Initial release
  • Version 1.1: 2007-10-16
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance