Crystal structure of the liganded anti-gibberellin A(4) antibody 4-B8(8)/E9 Fab fragment.Murata, T., Fushinobu, S., Nakajima, M., Asami, O., Sassa, T., Wakagi, T., Yamaguchi, I.
(2002) Biochem.Biophys.Res.Commun. 293: 489-496
- PubMed: 12054627
- DOI: 10.1016/S0006-291X(02)00225-5
- PubMed Abstract:
- Monoclonal antibodies specific for non-derivatized gibberellins I
Nakajima, M.,Yamaguchi, I.,Nagatani, A.,Kizawa, S.,Murofushi, N.,Furuya, N.,Takahashi, N.
(1991) PLANT CELL.PHYSIOL. 32: 515
Gibberellins, a class of plant hormones, consist of more than 120 members. Only a few of them are recognized by a receptor that remains unknown. The haptenic mouse monoclonal antibody, 4-B8(8)/E9, was generated against gibberellin A(4) (GA(4)) to rec ...
Gibberellins, a class of plant hormones, consist of more than 120 members. Only a few of them are recognized by a receptor that remains unknown. The haptenic mouse monoclonal antibody, 4-B8(8)/E9, was generated against gibberellin A(4) (GA(4)) to recognize biologically active GA selectivity, and we attempted to confirm the binding properties between the antibody and GA(4). We carried out an X-ray crystallographic analysis of the 4-B8(8)/E9 Fab fragment complexed with GA(4) at a 2.8 A resolution by using the molecular replacement method. The crystal structure of the Fab fragment showed the typical immunoglobulin fold of the beta-barrel structure which is the common motif of all antibodies. A small hapten-combining site was made up of three heavy chain CDR loops. On the other hand, CDRs of the light chain did not interact directly with GA(4). The C/D rings of the GA(4) molecule were in van der Waals contact mainly with the aromatic side chain of Tyr100AH and Phe100BH of CDR-H3. The 3 beta-hydroxyl and 6 beta-carboxyl groups were, respectively, hydrogen-bonded to the main chain of Ala33H and to the Thr53H heavy chain.
Department of Applied Biological Chemistry, Division of Agriculture and Agricultural Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan. email@example.com