Generation and characterization of high affinity humanized fab against Hepatitis B surface antigen

Tiwari, Ashutosh ; Dutta, Durgashree ; Khanna, Navin ; Acharya, Subrat K. ; Sinha, Subrata (2009) Generation and characterization of high affinity humanized fab against Hepatitis B surface antigen Molecular Biotechnology, 43 (1). pp. 29-40. ISSN 1073-6085

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Official URL: http://www.springerlink.com/content/mw313157042452...

Related URL: http://dx.doi.org/10.1007/s12033-009-9165-9

Abstract

5S is a mouse monoclonal IgG1 that binds to the 'a' epitope of the Hepatitis B surface antigen (HBsAg) and tested positive in an in vitro test for virus neutralization. We have earlier reported the generation of humanized single chain variable fragment (scFv) from the same. In this article we report the generation of a recombinant Fab molecule by fusing humanized variable domains of 5S with the constant domains of human IgG1. The humanized Fab expressed in E. coli and subsequently purified, retained a high binding affinity (KD =3.63 nmol/L) to HBsAg and bound to the same epitope of HBsAg as the parent molecule. The humanized Fab also maintained antigen binding in the presence of various destabilizing agents like 3 M NaCl, 30% DMSO, 8 M urea, and extreme pH. This high affinity humanized Fab provides a basis for the development of therapeutic molecules that can be safely utilized for the prophylaxis and treatment for Hepatitis B infection.

Item Type:Article
Source:Copyright of this article belongs to Springer.
Keywords:Fab Fragment; HBsAg; Humanization; Anti-HBs Antibody; Phage Display
ID Code:62579
Deposited On:22 Sep 2011 08:26
Last Modified:03 Jul 2012 13:23

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