| 摘要 |
The present invention discloses a new ribosome-inactivating protein, bryodin 2, isolated from the plamt Bryonia dioica. This ribosomeinactivating protein (RIP) is a type I RIP having a single polypeptide chain and no cellular receptor domain. Like many type I RIPs, bryodin 2 has a molecular weight of about 27,000 daltons and pI of 9.5. Bryodin 2 differs from previously identified ribosome-inactivating protein in its amino acid composition, amino acid sequence, and toxicity in vitro and in vivo. Bryodin 2 is useful, as are other type I ribosomeinactivating proteins, as am abortifacient, immunomodulator, anti-tumor or anti-viral agent. Compositions comprising bryodin 2 as am immunoconjugate or fusion molecule are particularly useful to kill cells of a target population.
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