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Related Experiment Videos

Ricin.

S Olsnes1, J V Kozlov

  • 1Institute for Cancer Research, The Norwegian Radium Hospital, Montebello, 0310, Oslo, Norway. olsnes@radium.uio.no

Toxicon : Official Journal of the International Society on Toxinology
|October 12, 2001
PubMed
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Ricin toxin uses its B-chain to bind cell surfaces, enabling the A-chain to enter the cytosol and halt protein synthesis by inactivating ribosomes. This plant toxin

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Toxicology

Background:

  • Ricin is a potent plant toxin composed of two distinct polypeptide chains: A and B.
  • The A-chain possesses enzymatic activity, while the B-chain exhibits lectin properties for cell surface binding.
  • Cellular entry and toxicity mechanisms of ricin are critical areas of toxicological research.

Purpose of the Study:

  • To elucidate the functional roles of ricin's A and B chains in cellular intoxication.
  • To detail the pathway of ricin entry and translocation into the cell's cytosol.
  • To investigate the molecular interactions governing ricin's retrograde transport and cytosolic delivery.

Main Methods:

  • Analysis of ricin's polypeptide functions (A-chain enzymatic activity, B-chain lectin binding).

Related Experiment Videos

  • Investigation of ricin-carbohydrate interactions at the cell surface.
  • Tracing ricin's endocytic pathway, including retrograde transport through Golgi to ER.
  • Examination of the role of the sec61p complex in ricin translocation to the cytosol.

    • Main Results:

    • Ricin's B-chain mediates binding to cell surface carbohydrates, a prerequisite for A-chain entry.
    • The toxin undergoes endocytosis and retrograde transport via the Golgi apparatus.
    • Translocation of the A-chain into the cytosol appears to be facilitated by the sec61p complex.

    Conclusions:

    • Ricin employs a sophisticated mechanism involving cell surface binding, endocytosis, and retrograde transport for intoxication.
    • The sec61p complex is implicated in the final step of delivering the toxic A-chain to the cytosol.
    • Understanding ricin's pathway provides insights into protein translocation and cellular defense mechanisms.