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J Virol, May 1998, p. 4396-4402, Vol. 72, No. 5
Institut de Biologie Structurale Jean-Pierre
Ebel, 38027 Grenoble, France,1 and
Institute of Biochemistry, University of Vienna, A-1030
Vienna, Austria2
Received 9 July 1997/Accepted 26 January 1998
The structure of a complex between human rhinovirus 2 (HRV2) and
the Fab fragment of neutralizing monoclonal antibody (MAb) 3B10 has
been determined to 25-Å resolution by cryoelectron microscopy and
three-dimensional reconstruction techniques. The footprint of 3B10 on
HRV2 is very similar to that of neutralizing MAb 8F5, which binds
bivalently across the icosahedral twofold axis. However, the 3B10 Fab
fragment (Fab-3B10) is bound in an orientation, inclined at
approximately 45° to the surface of the virus capsid, which is
compatible only with monovalent binding of the antibody. The canyon
around the fivefold axis is not directly obstructed by the bound Fab.
The X-ray structures of a closely related HRV (HRV1A) and a Fab
fragment were fitted to the density maps of the HRV2-Fab-3B10 complex
obtained by cryoelectron microscope techniques. The footprint of 3B10
on the viral surface is largely on VP2 but also covers the VP3 loop
centered on residue 3064 and the VP1 loop centered on residue 1267. MAb
3B10 can interact directly with VP2 residue 2164, the site of an escape
mutation on VP2, and with VP1 residues 1264 to 1267, the site of a
deletion escape mutation. Deletion of these residues shortens the VP1
loop, moving it away from the MAb binding site. All structural and
biochemical evidence indicates that MAb 3B10 binds to a conformation
epitope on HRV2.
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Structure of a Neutralizing Antibody Bound
Monovalently to Human Rhinovirus 2
*
Corresponding author. Mailing address: Institut de
Biologie Structurale Jean-Pierre Ebel, 41 av. des Martyrs, 38027 Grenoble, France. Phone: (33) 4 76 884568. Fax: (33) 4 76 885494. E-mail: HEWAT{at}IBS.FR.
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