Patent ID: 7265217

Claim:
A process for the production of a mistletoe lectin polypeptide in a heterologous system, said mistletoe lectin comprising having a polypeptide sequence of SEQ ID NO: 1 or SEQ ID NO: 40, wherein Xaa at position 533 of SEQ ID NO: 1 and Xaa at position 534 of SEQ ID NO: 40 is phenylalanine, or a fragment thereof that binds to galactose-containing structures on the surface of cell membranes or that binds to ribosomal 28S subunit, comprising the step of expressing by means of a eukaryotic or prokaryotic vector, in which a nucleic acid coding for the mistletoe lectin polypeptide according to the usual genetic code or the fragment thereof is cloned in a suitable heterologous eukaryotic or prokaryotic host.