Transport protein which is used to introduce chemical compounds into nerve cells

1. A transport protein, obtained by modification of the heavy chain of a Clostridium botulinum type A (BoNT/A), said heavy chain comprising a H N -fragment and a H C -fragment, wherein said H C -fragment includes a H CC -fragment and a H CN -fragment, said H CC -fragment corresponding to amino acids 1092 to 1296 of the Clostridium botulinum neurotoxin type A (SEQ ID NO.: 1, 14, 15 or 16), are substituted by one of the following sequences:

corresponding to Clostridium botulinum neurotoxin type B protein (SEQ ID NO.: 17, 18, 19, 20, 21 or 22), amino acids 1079 to 1291;

corresponding to Clostridium botulinum neurotoxin type C 1 protein (SEQ ID NO.: 23, 24 or 25), amino acids 1093 to 1291, or amino acids 1084 to 1280 of BoNT/C 1 (SEQ ID NO.: 26 or 27);

corresponding to Clostridium botulinum neurotoxin type D protein (SEQ ID NO.: 28 or 29), amino acids 1080 to 1276, or amino acids 1089 to 1285 of BoNT/D (SEQ ID NO.: 30 or 31);

corresponding to Clostridium botulinum neurotoxin type E protein (SEQ ID NO.: 32), amino acids 1067 to 1252, or amino acids 1067 to 1251 of BoNT/E (SEQ ID NO.: 33 or 34);

corresponding to Clostridium botulinum neurotoxin type F protein (SEQ ID NO.: 35), amino acids 1087 to 1274, amino acids 1088 to 1280 of BoNT/F (SEQ ID NO.: 36), amino acids 1085 to 1278 of BoNT/F (SEQ ID NO.: 37), or amino acids 1076 to 1268 of BoNT/F (SEQ ID NO.: 38); or

corresponding to Clostridium botulinum neurotoxin type G protein (SEQ ID NO.: 39 or 40), amino acids 1087 to 1297;

wherein said transport protein binds to a nerve cell.

2. The transport protein according to claim 1 , wherein the protein binds specifically to nerve cells and enters the cells by endocytosis.

3. The transport protein according to claim 1 , wherein the protein binds specifically to complex gangliosides of cholinergic motor neurons, localised in the plasma membrane.

4. The transport protein according to claim 1 , wherein said Hcc-fragment corresponding to amino acids 1092 to 1296 of the Clostridium botulinum neurotoxin type A (SEQ ID NO.: 1, 14, 15 or 16), are substituted by one of the following sequences:

corresponding to Clostridium botulinum neurotoxin type B protein (SEQ ID NO.: 17, 18, 19, 20, 21 or 22), amino acids 1079 to 1291;

corresponding to Clostridium botulinum neurotoxin type C 1 protein (SEQ ID NO.: 23, 24 or 25), amino acids 1093 to 1291, or amino acids 1084 to 1280 of BoNT/C 1 (SEQ ID NO.: 26 or 27).

5. The transport protein according to claim 4 , wherein the protein exhibits a binding affinity for a nerve cell that is at least 15% higher than native Clostridium botulinum type A.

6. The transport protein according to claim 4 , wherein said transport protein binds to a nerve cell with a higher affinity than native Clostridium botulinum type A.

7. A composition comprising the transport protein according to claim 1 , wherein said transport protein is coupled to a clostridial neurotoxin protease.

8. A method for treating a disorder or disease for which a therapy with botulinum neurotoxin is indicated, said method comprising administration of an effective amount of the composition according to claim 7 .

9. The method of claim 8 , wherein the disorder or disease is one of the following: hemi-facial spasm, spasmodic torticollis, spasticities, dystonias, migraine, pain, disorders of the neck and lumbar vertebral column, strabism and hypersalivation.

10. A method for treating a cosmetic indication selected from hyperhidrosis and pronounced facial wrinkles, said method comprising administration of an effective amount of the composition according to claim 7 .

11. The transport protein according to claim 3 , wherein the complex gangliosides of cholinergic motor neurons is GT1 b.