3CB4

The Crystal Structure of LepA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.246 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The structure of LepA, the ribosomal back translocase.

Evans, R.N.Blaha, G.Bailey, S.Steitz, T.A.

(2008) Proc.Natl.Acad.Sci.Usa 105: 4673-4678

  • DOI: 10.1073/pnas.0801308105

  • PubMed Abstract: 
  • LepA is a highly conserved elongation factor that promotes the back translocation of tRNAs on the ribosome during the elongation cycle. We have determined the crystal structure of LepA from Escherichia coli at 2.8-A resolution. The high degree of seq ...

    LepA is a highly conserved elongation factor that promotes the back translocation of tRNAs on the ribosome during the elongation cycle. We have determined the crystal structure of LepA from Escherichia coli at 2.8-A resolution. The high degree of sequence identity between LepA and EF-G is reflected in the structural similarity between the individual homologous domains of LepA and EF-G. However, the orientation of domains III and V in LepA differs from their orientations in EF-G. LepA also contains a C-terminal domain (CTD) not found in EF-G that has a previously unobserved protein fold. The high structural similarity between LepA and EF-G enabled us to derive a homology model for LepA bound to the ribosome using a 7.3-A cryo-EM structure of a complex between EF-G and the 70S ribosome. In this model, the very electrostatically positive CTD of LepA is placed in the direct vicinity of the A site of the large ribosomal subunit, suggesting a possible interaction between the CTD and the back translocated tRNA or 23S rRNA.


    Organizational Affiliation

    Departments of Molecular Biophysics and Biochemistry and Chemistry and Howard Hughes Medical Institute, Yale University, New Haven, CT 06520-8114, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GTP-binding protein lepA
D, A, B, C, E, F
599Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: lepA
EC: 3.6.5.n1
Find proteins for P60785 (Escherichia coli (strain K12))
Go to UniProtKB:  P60785
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.246 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 97.960α = 90.00
b = 146.243β = 100.60
c = 139.317γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SOLVEphasing
CBASSdata collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-03-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Source and taxonomy, Version format compliance