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J. Virol., Jun 1997, 4736-4743, Vol 71, No. 6
DR Shafren, DJ Dorahy, RA Ingham, GF Burns and RD Barry
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.
Copyright © 1997, American Society for Microbiology
Coxsackievirus A21 binds to decay-accelerating factor but requires intercellular adhesion molecule 1 for cell entry
Department of Microbiology, Faculty of Medicine, The University of Newcastle, New South Wales, Australia. dshafren@medicine- dmb.newcastle.ed.au
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