| 摘要 |
A chimeric transmembrane protein comprising a membrane-spanning polypeptide and an internalization motif of the sequence MXXXL, where X is any amino acid. The chimeric protein can be expressed on the surface of a cell and internalized. Polynucleotides and expression vectors encoding chimeric transmembrane proteins are also provided. Expression of chimeric proteins in the plasma membrane of target cells, followed by binding of antibodies to the chimeric proteins, where the antibodies are conjugated to a cytotoxic agent, provides a means to deliver the cytotoxic agent to the inside of the target cells.
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