Methods of activating clostridial toxins

Abstract

The specification discloses modified Clostridial toxins comprising an exogenous Clostridial toxin di-chain loop protease cleavage site located within the di-chain loop region; polynucleotide molecules encoding such modified Clostridial toxins; method of producing such modified Clostridial toxins, method of activating such modified Clostridial toxins and methods of activating recombinantly-expressed Clostridial toxins.

What is claimed: 
     
         1 . A modified Clostridial toxin comprising an exogenous BoNT/A di-chain loop region including a BoNT/A di-chain protease cleavage site;
 wherein the Clostridial toxin is a BoNT/B; and,   wherein the BoNT/A di-chain loop region replaces an endogenous Clostridial toxin di-chain loop region.   
     
     
         2 . A polynucleotide molecule encoding a modified Clostridial toxin according to  claim 1 . 
     
     
         3 . A method of producing a modified Clostridial toxin comprising the step of expressing in a cell a polynucleotide molecule according to  claim 2 , wherein expression from the polynucleotide molecule produces the encoded modified Clostridial toxin. 
     
     
         4 . A method of producing a modified Clostridial toxin comprising the steps of:
 a. oducing into a cell a polynucleotide molecule as defined in  claim 2 ; and   b. expressing the polynucleotide molecule, wherein expression from the polynucleotide molecule produces the encoded modified Clostridial toxin.