Methods for the manufacture of proteolytically processed polypeptides
The present invention relates to a novel protcolytically active polypeptide and various uses of the polypeptide (and others) in screening and manufacturing methods.
1. A method for manufacturing a di-chain botulinum neurotoxin serotype F (BoNT/F) or derivative thereof, the method comprising contacting Lys-C polypeptide with a single-chain BoNT/F or derivative thereof; wherein the single-chain BoNT/F or derivative thereof is proteolytically processed by the Lys-C polypeptide to produce a di-chain BoNT/F or derivative thereof.
2. The method of claim 1 , wherein the single-chain BoNT/F or derivative thereof comprises an amino acid sequence having at least 50% sequence identity with a polypeptide sequence selected from the group consisting of: SEQ ID NO: 19; SEQ ID NO: 20; SEQ ID NO: 21; SEQ ID NO: 22; and SEQ ID NO: 23.
3. The method of claim 1 , wherein the single-chain BoNT/F is prepared by recombinant expression in E. coli.
4. The method of claim 1 , wherein the single-chain BoNT/F or a derivative thereof is a naturally-occurring neurotoxin, a recombinant neurotoxin, a modified neurotoxin, a neurotoxin lacking the native H C domain or parts thereof, or a BoNT/F derivative with other amino acid residues replacing the neurotoxin H C domain.
5. The method of claim 2 , wherein the Lys-C polypeptide proteolytically cleaves the single-chain BoNT/F or derivative thereof at a position immediately C-terminal to a basic amino acid residue within the amino acid sequence having at least 50% sequence identity with a polypeptide sequence selected from the group consisting of: SEQ ID NO: 19; SEQ ID NO: 20; SEQ ID NO: 21; SEQ ID NO: 22; and SEQ ID NO: 23.
6. The method of claim 1 , wherein the step of contacting the Lys-C polypeptide with the single-chain BoNT/F or derivative thereof occurs within a cell, in a cell lysate, in a purified cell lysate, or in a subject.