Ricin - P02879 (RICI_RICCO)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P02879: 57
Ricin is highly toxic to animal cells and to a lesser extent to plant cells. The A chain acts as a glycosidase that removes a specific adenine residue from an exposed loop of the 28S rRNA (A4324 in mammals), leading to rRNA breakage. As this loop is involved in elongation factor binding, modified ribosomes are catalytically inactive and unable to support protein synthesis. The A chain can inactivate a few thousand ribosomes per minute, faster than the cell can make new ones. Therefore a single A chain molecule can kill an animal cell. The B chain binds to beta-D-galactopyranoside moieties on cell surface glycoproteins and glycolipids and facilitates the entry into the cell of the A chain; B chains are also responsible for cell agglutination (Lectin activity). UniProt
Catalytic Activity
Endohydrolysis of the N-glycosidic bond at one specific adenosine on the 28S rRNA. UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
Disulfide-linked dimer of A and B chains. UniProt
The B chain is composed of two domains, each domain consists of 3 homologous subdomains (alpha, beta, gamma). UniProt
  • Organism: Castor bean
  • Length:
  • UniProt
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