Issue 3, 2011
From the journal:

Molecular BioSystems

Structural and energetic hot-spots for the interaction between a ladder-like polycyclic ether and the anti-ciguatoxin antibody 10C9Fab†

Mihoko Ui,ab   Yoshikazu Tanaka,acd   Takeshi Tsumuraya,e   Ikuo Fujii,e   Masayuki Inoue,fg   Masahiro Hiramaf  and  Kouhei Tsumoto*ah  

* Corresponding authors

a Department of Medical Genome Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8562, Japan
E-mail: tsumoto@ims.u-tokyo.ac.jp
Fax: + 81 4-7136-3601
Tel: + 81 3-5449-5316

b Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan

c Creative Research Institute “Sousei”, Hokkaido University, Sapporo, Japan

d Faculty of Advanced Life Sciences, Hokkaido University, Sapporo, Japan

e Department of Biological Science, Graduate School of Science, Osaka Prefecture University, Osaka 599-8570, Japan

f Department of Chemistry, Graduate School of Science, Tohoku University, and SORST, Japan Science and Technology Agency (JST), Sendai 980-8578, Japan

g Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

h Medical Proteomics Laboratory, Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo 108-8639, Japan

Abstract

The mechanism by which anti-ciguatoxin antibody 10C9Fab recognizes a fragment of ciguatoxin CTX3C (CTX3C-ABCDE) was investigated by mutational analysis based on structural data. 10C9Fab has an extraordinarily large and deep antigen-binding pocket at the center of its variable region. We mutated several residues located at the antigen-binding pocket to Ala, and kinetic analysis of the interactions between the mutant proteins and the antigen fragment was performed. The results indicate that some residues associated with the rigid antigen-binding pocket are structural hot-spots and that L-N94 is an energetic hot-spot for association of the antibody with the antigen fragment CTX3C-ABCDE, suggesting the importance of structural complementarity and energetic hot-spot interactions for specific recognition of polycyclic ethers.

Graphical abstract: Structural and energetic hot-spots for the interaction between a ladder-like polycyclic ether and the anti-ciguatoxin antibody 10C9Fab

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Article information

DOI
https://doi.org/10.1039/C0MB00162G
Article type
Paper
Submitted
17 Aug 2010
Accepted
11 Oct 2010
First published
15 Dec 2010

Mol. BioSyst., 2011,7, 793-798

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Structural and energetic hot-spots for the interaction between a ladder-like polycyclic ether and the anti-ciguatoxin antibody 10C9Fab

M. Ui, Y. Tanaka, T. Tsumuraya, I. Fujii, M. Inoue, M. Hirama and K. Tsumoto, Mol. BioSyst., 2011, 7, 793 DOI: 10.1039/C0MB00162G

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