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J. Virol., Jun 1997, 4736-4743, Vol 71, No. 6
Copyright © 1997, American Society for Microbiology

Coxsackievirus A21 binds to decay-accelerating factor but requires intercellular adhesion molecule 1 for cell entry

DR Shafren, DJ Dorahy, RA Ingham, GF Burns and RD Barry
Department of Microbiology, Faculty of Medicine, The University of Newcastle, New South Wales, Australia. dshafren@medicine- dmb.newcastle.ed.au

It is becoming increasingly apparent that many viruses employ multiple receptor molecules in their cell entry mechanisms. The human enterovirus coxsackievirus A21 (CAV21) has been reported to bind to the N-terminal domain of intercellular adhesion molecule 1 (ICAM-1) and undergo limited replication in ICAM-1-expressing murine L cells. In this study, we show that in addition to binding to ICAM-1, CAV21 binds to the first short consensus repeat (SCR) of decay-accelerating factor (DAF). Dual antibody blockade using both anti-ICAM-1 (domain 1) and anti-DAF (SCR1) monoclonal antibodies (MAbs) is required to completely abolish binding and replication of high-titered CAV21. However, the binding of CAV21 to DAF, unlike that to ICAM-1, does not initiate a productive cell infection. The capacity of an anti-DAF (SCR3) MAb to block CAV21 infection but not binding, coupled with immunoprecipitation data from chemical cross-linking studies, indicates that DAF and ICAM-1 are closely associated on the cell surface. It is therefore suggested that DAF may function as a low-affinity attachment receptor either enhancing viral presentation or providing a viral sequestration site for subsequent high-affinity binding to ICAM-1.


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