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Computational Docking of Antibody-Antigen Complexes, Opportunities and Pitfalls Illustrated by Influenza Hemagglutinin
Institute for Research in Biomedicine, via Vela 6, 6500 Bellinzona, Switzerland
These authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 2 November 2010; in revised form: 22 December 2010 / Accepted: 4 January 2011 / Published: 5 January 2011
Abstract: Antibodies play an increasingly important role in both basic research and the pharmaceutical industry. Since their efficiency depends, in ultimate analysis, on their atomic interactions with an antigen, studying such interactions is important to understand how they function and, in the long run, to design new molecules with desired properties. Computational docking, the process of predicting the conformation of a complex from its separated components, is emerging as a fast and affordable technique for the structural characterization of antibody-antigen complexes. In this manuscript, we first describe the different computational strategies for the modeling of antibodies and docking of their complexes, and then predict the binding of two antibodies to the stalk region of influenza hemagglutinin, an important pharmaceutical target. The purpose is two-fold: on a general note, we want to illustrate the advantages and pitfalls of computational docking with a practical example, using different approaches and comparing the results to known experimental structures. On a more specific note, we want to assess if docking can be successful in characterizing the binding to the same influenza epitope of other antibodies with unknown structure, which has practical relevance for pharmaceutical and biological research. The paper clearly shows that some of the computational docking predictions can be very accurate, but the algorithm often fails to discriminate them from inaccurate solutions. It is of paramount importance, therefore, to use rapidly obtained experimental data to validate the computational results.
Keywords: antibody modeling; computational docking; influenza; hemagglutinin; antibody-antigen complexes
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Pedotti, M.; Simonelli, L.; Livoti, E.; Varani, L. Computational Docking of Antibody-Antigen Complexes, Opportunities and Pitfalls Illustrated by Influenza Hemagglutinin. Int. J. Mol. Sci. 2011, 12, 226-251.
Pedotti M, Simonelli L, Livoti E, Varani L. Computational Docking of Antibody-Antigen Complexes, Opportunities and Pitfalls Illustrated by Influenza Hemagglutinin. International Journal of Molecular Sciences. 2011; 12(1):226-251.
Pedotti, Mattia; Simonelli, Luca; Livoti, Elsa; Varani, Luca. 2011. "Computational Docking of Antibody-Antigen Complexes, Opportunities and Pitfalls Illustrated by Influenza Hemagglutinin." Int. J. Mol. Sci. 12, no. 1: 226-251.