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Journal of Virology, September 2004, p. 10034-10044, Vol. 78, No. 18
0022-538X/04/$08.00+0 DOI: 10.1128/JVI.78.18.10034-10044.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.
Department of Biological Sciences, Purdue University, West Lafayette, Indiana,1 School of Biochemistry and Microbiology, University of Leeds, Leeds,2 Liverpool School of Tropical Medicine, Liverpool, United Kingdom3
Received 13 February 2004/ Accepted 7 May 2004
Intercellular adhesion molecule 1 (ICAM-1) is the cellular receptor for the major group of human rhinovirus serotypes, including human rhinovirus 14 (HRV14) and HRV16. A naturally occurring variant of ICAM-1, ICAM-1Kilifi, has altered binding characteristics with respect to different HRV serotypes. HRV14 binds to ICAM-1 only transiently at physiological temperatures but forms a stable complex with ICAM-1Kilifi. Conversely, HRV16 forms a stable complex with ICAM-1 but does not bind to ICAM-1Kilifi. The three-dimensional structures of HRV14 and HRV16, complexed with ICAM-1, and the structure of HRV14, complexed with ICAM-1Kilifi, have been determined by cryoelectron microscopy (cryoEM) image reconstruction to a resolution of approximately 10 Å. Structures determined by X-ray crystallography of both viruses and of ICAM-1 were fitted into the cryoEM density maps. The interfaces between the viruses and receptors contain extensive ionic networks. However, the interactions between the viruses and ICAM-1Kilifi contain one less salt bridge than between the viruses and ICAM-1. As HRV16 has fewer overall interactions with ICAM-1 than HRV14, the absence of this charge interaction has a greater impact on the binding of ICAM-1Kilifi to HRV16 than to HRV14.
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