| 摘要 |
The invention features the use of a peptide for transferring genes in a eukaryotic target cell, which peptide has about 10 to about 200, in particular about 15 to about 150 amino acids, and advantageously about 20 amino acids, in which 30 % at least of the amino acids are constituted by proline radicals, which proline radicals are regularly arranged so as to induce polypeptide chain turnings at about 180~ (".beta.-turn" or "reverse-turn"), these turns being regularly spaced and gathering in a polyproline .beta.-turn helix, in a polypeptide construction containing, on the said peptide N-terminal side (upstream), an N-terminal (upstream) proteinic domain capable of recognising a targeted surface molecule or an antigen expressed on a cellular surface, in particular an appropriate receptor (targeted receptor) located on the said eukaryotic cell, and on the said peptide C-terminal side (downstream), a Cterminal (downstream) protein domain capable of recognising an appropriate receptor (auxiliary receptor) located on the said eukaryotic cell, which peptide is capable of facilitating or inhibiting interaction between the Cterminal (downstream) protein domain and the auxiliary receptor, the inhibition of this interaction taking place so long as the N-terminal (upstream) protein domain has not interacted with the targeted receptor, and the facilitating of the interaction between the C-terminal (downstream) protein domain and the auxiliary receptor taking place when the N-terminal (upstream) protein domain has interacted with the targeted receptor.
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