Hybrid proteins between an extracytoplasmic enzyme and at least another protein, preparation and method and application therefor

摘要

Hybrid proteins between a fragment of an extracytoplasmic protein P1, a protein P2 and an extracytoplasmic enzyme, the protein P2 being, in particular, an antigen or a single-chain variable fragment (Fv) of an antibody, preparation method therefor and applications thereof, in particular as a diagnostic agent and in the screening of a nucleic acid library or in the selection of recombinant clones. DNA sequences coding for the said hybrid proteins, expression vectors containing the said sequences, bacterial or yeast strains transformed by the said vectors and application thereof for the production and secretion of the said hybrid proteins. The said hybrid protein comprises, in particular, in succession, a fragment of a protein P1 exported or secreted by a microorganism, in particular one chosen from the group comprising bacteria and yeasts, a suitable protein P2 or a fragment of the latter and at least one functional fragment of a suitable enzyme, and possesses both properties of the enzyme and some properties of the protein P2, in particular that of interacting specifically with an antibody, an antigen or a receptor.