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Recombinant immunotoxin for the treatment of cancer was made by connecting toxins to 'carcinoma-specific' antibodies that selectively bind to cancer cells, then kills them without harming the normal cells. The divalent recombinant immunotoxin, [B3(Fab)-ext-PE38]2, is a derivative of B3(Fab)-PE38. B3(Fab)-PE38 was made by fusing the Fab domain of the monoclonal antibody (MAb) B3 to PE38, a truncated mutant form of Pseudomonas exotoxin (PE). In this study, B3(Fab)-ext-PE38 was constructed, which has the hinge region of the B3(Fab)-PE38 extended with the peptide extension, G4C(G4S)2, and connected to the C3 connector. The Cys residue of the extension peptide chain makes the disulfide bond between the two Fab domains. The extension sequence (ext) makes the dimerization of B3(Fab)-ext-PE38 easier to form the divalent immunotoxin, because it decreases the steric hindrance between the two PE38s. The constructed genes were expressed in E. coli as inclusion bodies. Polypeptides that were obtained from the inclusion body were refolded, and the active forms were purified. The ID50 values of the divalent molecule, [B3(Fab)-ext-PE38]2, were about 4 ng/ml on A431 cell lines, about 1 ng/ml on CRL1739 cell lines, and 5 ng/ml on MCF-7 cell lines. The [B3(Fab)-ext-PE38]2 showed about a 12-fold higher cytotoxicity on CRL1739 cell lines than B3(scFv)-PE40 did.
J H Park, and
H W Kwon, and
H K Chung, and
I H Kim, and
K Ahn, and
E J Choi, and
I Pastan, and
M Choe
January 2012,
Protein engineering, design & selection : PEDS,
J H Park, and
H W Kwon, and
H K Chung, and
I H Kim, and
K Ahn, and
E J Choi, and
I Pastan, and
M Choe
September 2012,
Bioorganic & medicinal chemistry letters,
J H Park, and
H W Kwon, and
H K Chung, and
I H Kim, and
K Ahn, and
E J Choi, and
I Pastan, and
M Choe
August 2011,
Journal of microbiology and biotechnology,
J H Park, and
H W Kwon, and
H K Chung, and
I H Kim, and
K Ahn, and
E J Choi, and
I Pastan, and
M Choe
August 1993,
Proceedings of the National Academy of Sciences of the United States of America,
J H Park, and
H W Kwon, and
H K Chung, and
I H Kim, and
K Ahn, and
E J Choi, and
I Pastan, and
M Choe
March 1978,
Proceedings of the National Academy of Sciences of the United States of America,
J H Park, and
H W Kwon, and
H K Chung, and
I H Kim, and
K Ahn, and
E J Choi, and
I Pastan, and
M Choe
September 2022,
Bioinformatics (Oxford, England),
J H Park, and
H W Kwon, and
H K Chung, and
I H Kim, and
K Ahn, and
E J Choi, and
I Pastan, and
M Choe
July 1991,
The Journal of biological chemistry,
J H Park, and
H W Kwon, and
H K Chung, and
I H Kim, and
K Ahn, and
E J Choi, and
I Pastan, and
M Choe
May 2022,
Journal of cheminformatics,
J H Park, and
H W Kwon, and
H K Chung, and
I H Kim, and
K Ahn, and
E J Choi, and
I Pastan, and
M Choe
September 2015,
Astrobiology,
J H Park, and
H W Kwon, and
H K Chung, and
I H Kim, and
K Ahn, and
E J Choi, and
I Pastan, and
M Choe
September 2012,
Organic & biomolecular chemistry,
