[Recombinant design and expression of human anti-rabies virus ScdsFv].

To constructed the recombinant human anti-rabies virus ScdsFv, cys sites were introduced into framework region (FR) of VH and VL genes which were amplified from human anti-rabies virus ScFv respectively using genetic point mutation technology. Cloned the ScdsFv gene into expression vector pET22b (+) and transformed into E. coli BL21 (DE3). The target protein was expressed by inducing with IPTG. Followed by renaturation in vitro and purified by Ni-NTA. The binding activity of ScdsFv was identified by Fluorescent antibody test (FAT) and ELISA. Results showed that recombinant ScdsFv were expressed at high level. Purity of the protein > 90% after purified by Ni-NTA and renaturaton in vitro. FAT and ELISA results demonstrated that ScdsFv could binding antigen specificity and was more stable than ScFv. Recombinant ScdsFv provided experiment materials for further functional study.