1RTC

THE STRUCTURE OF RECOMBINANT RICIN A CHAIN AT 2.3 ANGSTROMS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of recombinant ricin A chain at 2.3 A.

Mlsna, D.Monzingo, A.F.Katzin, B.J.Ernst, S.Robertus, J.D.

(1993) Protein Sci. 2: 429-435

  • DOI: 10.1002/pro.5560020315

  • PubMed Abstract: 
  • The plant cytotoxin ricin is a heterodimer with a cell surface binding (B) chain and an enzymatically active A chain (RTA) known to act as a specific N-glycosidase. RTA must be separated from B chain to attack rRNA. The X-ray structure of ricin has b ...

    The plant cytotoxin ricin is a heterodimer with a cell surface binding (B) chain and an enzymatically active A chain (RTA) known to act as a specific N-glycosidase. RTA must be separated from B chain to attack rRNA. The X-ray structure of ricin has been solved recently; here we report the structure of the isolated A chain expressed from a clone in Escherichia coli. This structure of wild-type rRTA has and will continue to serve as the parent compound for difference Fouriers used to assess the structure of site-directed mutants designed to analyze the mechanism of this medically and commercially important toxin. The structure of the recombinant protein, rRTA, is virtually identical to that seen previously for A chain in the heterodimeric toxin. Some minor conformational changes due to interactions with B chain and to crystal packing differences are described. Perhaps the most significant difference is the presence in rRTA of an additional active site water. This molecule is positioned to act as the ultimate nucleophile in the depurination reaction mechanism proposed by Monzingo and Robertus (1992, J. Mol. Biol. 227, 1136-1145).


    Related Citations: 
    • Structure of Ricin A-Chain at 2.5 Angstroms
      Katzin, B.J.,Collins, E.J.,Robertus, J.D.
      (1991) Proteins 10: 251
    • Crystallization of Ricin a Chain Obtained from a Cloned Gene Expressed in Escherichia Coli
      Robertus, J.D.,Piatak, M.,Ferris, R.,Houston, L.L.
      (1987) J.Biol.Chem. 262: 19


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Texas, Austin 78712.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RICIN
A
268Ricinus communisMutation(s): 0 
Find proteins for P02879 (Ricinus communis)
Go to UniProtKB:  P02879
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Work: 0.230 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 42.600α = 90.00
b = 68.100β = 112.90
c = 50.200γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORrefinement
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1993-10-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance