Tetanus toxin is a potent neurotoxin that is taken up by presynaptic terminals at the neuromuscular junction, travels retrogradely within motor neurons and is transported transsynaptically to spinal cord interneurons. Upon entering the motor neuron, tetanus toxin associates with lipid rafts, is incorporated into non-acidified vesicles, sorted in a Rab 5/7 dependent pathway and transported to the cell body. The toxin is trancytosed so that it enters upstream inhibitory neurons where it cleaves VAMP-2, inhibiting neurotransmitter release. Tetanus toxin inhibits neurotransmitter release with great potency and selectivity, cleaving a bond in vesicle-associated membrane protein-2 (VAMP-2) or synaptobrevin-2, thereby preventing the fusion of synaptic vesicles with the presynaptic membrane. Tetanus toxoid is currently used as a vaccine to produce immunity to tetanus, the disease caused by Clostridium tetani. Additionally, tetanus toxoid functions as a carrier of conjugated polysaccharides in the development of vaccines against encapsulated bacterial pathogens.
Tetanus toxin C-fragment consists of the C-terminal portion of the heavy chain of tetanus toxin. Although it is non toxic, it retains the binding and internalization properties associated with intact tetanus toxin. These properties make C-fragment and its conjugates useful in tracing nerve fiber connections in the CNS.
Source:Recombinant protein corresponding to the light chain from tetanus toxin, aa2-438, containing 12aa from the affinity tag at the N-terminus for a total length of 449aa, expressed in E. coli.
Biological Activity:Tested for activity in an endopeptidase assay. Tetanus toxin light chain (20nm) was able to cleave 5uM His6-Synaptobrevin at 37°C in 20mM Tris-HCI, pH 8.0, 50mM NaCI.
Toxicity:The light chain of Tetanus neurotoxin is non-toxic and unable to penetrate cells in the absence of the heavy chain. The expression and purification of light chain from a recombinant setting ensures there is no possible contamination with heavy chain or full length intact toxin.
Storage and Stability:Lyophilized powder may be stored at -20°C. Reconstitute with sterile buffer or ddH2O. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Reconstituted product is stable for 6 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.
仕様
Size：10ug
Source Antigen：Recombinant, E. coli
Grade：Purified
Purity：Purified (~90%)
Form：Supplied as a lyophilized powder in 20mM HEPES, pH 7.4, 1.25% lactose. Reconstitute with 90ul sterile ddH2O.
