1B44

CRYSTAL STRUCTURE OF THE B SUBUNIT OF HEAT-LABILE ENTEROTOXIN FROM E. COLI CARRYING A PEPTIDE WITH ANTI-HSV ACTIVITY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the B subunit of Escherichia coli heat-labile enterotoxin carrying peptides with anti-herpes simplex virus type 1 activity.

Matkovic-Calogovic, D.Loregian, A.D'Acunto, M.R.Battistutta, R.Tossi, A.Palu, G.Zanotti, G.

(1999) J.Biol.Chem. 274: 8764-8769

  • Primary Citation of Related Structures:  1LTR

  • PubMed Abstract: 
  • Two chimeric proteins, consisting of the B subunit of Escherichia coli heat-labile enterotoxin with different peptides fused to the COOH-terminal ends, have been crystallized and their three-dimensional structure determined. The two extensions corres ...

    Two chimeric proteins, consisting of the B subunit of Escherichia coli heat-labile enterotoxin with different peptides fused to the COOH-terminal ends, have been crystallized and their three-dimensional structure determined. The two extensions correspond to (a) a nonapeptide representing the COOH-terminal sequence of the small subunit of herpes simplex virus type 1 ribonucleotide reductase and (b) a 27-amino acid long peptide, corresponding to the COOH-terminal end of the catalytic subunit (POL) of DNA polymerase from the same virus. Both proteins crystallize in the P41212 space group with one pentameric molecule per asymmetric unit, corresponding to a solvent content of about 75%. The overall conformation of the B subunit pentamer in the two chimeric proteins, which consists of five identical polypeptide chains, is very similar to that in the native AB complex and conforms strictly to 5-fold symmetry. On the contrary, the peptide extensions are essentially disordered: in the case of the nonapeptide, only 5 and 6 amino acids were, respectively, positioned in two monomers, while in the other three only 2 residues are ordered. The extension is fully confined to the surface of the pentamer opposite to the face that interacts with the membrane and consequently it does not interfere with the ability of the B subunit to interact with membrane receptors. Moreover, the conformational flexibility of the two peptide extensions could be correlated to their propensity for proteolytic processing and consequent release of a biologically active molecule into cultured cells.


    Related Citations: 
    • Specific Inhibition of Herpes Virus Replication by Receptor-Mediated Entry of an Antiviral Peptide Linked to Escherichia Coli Enterotoxin B Subunit
      Marcello, A.,Loreggian, A.,Cross, A.,Marsden, H.,Hirst, T.R.,Palu, G.
      (1994) Proc.Natl.Acad.Sci.USA 91: 8994
    • Refined Structure of Escherichia Coli Heat-Labile Enterotoxin, a Close Relative of Cholera Toxin
      Sixma, T.K.,Kalk, K.H.,Van Zanten, B.A.M.,Dauter, Z.,Kingma, J.,Witholt, B.,Hol, W.G.J.
      (1993) J.Mol.Biol. 230: 890


    Organizational Affiliation

    Department of Organic Chemistry and Biopolymer Research Center, University of Padova, Via Marzolo 1, 35131 Padova, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (B-POL SUBUNIT OF HEAT-LABILE ENTEROTOXIN)
D, E, F, G, H
129Escherichia coliGene Names: eltB (ltpB)
Find proteins for P0CK94 (Escherichia coli)
Go to UniProtKB:  P0CK94
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.212 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 127.100α = 90.00
b = 127.100β = 90.00
c = 176.100γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-01-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance