The first immunoglobulin-like domain of HveC is sufficient to bind herpes simplex virus gD with full affinity, while the third domain is involved in oligomerization of HveC

被引:114
作者
Krummenacher, C
Rux, AH
Whitbeck, JC
Ponce-De-Leon, M
Lou, H
Baribaud, I
Hou, WF
Zou, CH
Geraghty, RJ
Spear, PG
Eisenberg, RJ
Cohen, GH
机构
[1] Univ Penn, Sch Dent Med, Dept Microbiol, Philadelphia, PA 19104 USA
[2] Univ Penn, Sch Dent Med, Ctr Oral Hlth Res, Philadelphia, PA 19104 USA
[3] Univ Penn, Sch Vet Med, Philadelphia, PA 19104 USA
[4] Northwestern Univ, Sch Med, Dept Microbiol Immunol, Chicago, IL 60611 USA
关键词
D O I
10.1128/JVI.73.10.8127-8137.1999
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The human herpesvirus entry mediator C (HVeC/PRR1) is a member of the immunoglobulin family used as a cellular receptor by the alphaherpesviruses herpes simplex virus (HSV), pseudorabies virus, and bovine herpesvirus type 1. We previously demonstrated direct binding of the purified HveC ectodomain to purified HSV type 1 (HSV-1) and HSV-2 glycoprotein D (gD). Here, using a baculovirus expression system, we constructed and purified truncated forms of the receptor containing one [HveC(143t)], two [HveC(245t)], or all three immunoglobulin-like domains [HveC(346t)] of the extracellular region. All three constructs were equally able to compete with HveC(346t) for go binding. The variable domain bound to virions and blocked HSV infection as well as HveC(346t). Thus, all of the binding to the receptor occurs within the first immunoglobulin-like domain, or V-domain, of HveC. These data confirm and extend those of Cocchi ct al. (F. Cocchi, M. Lopez, L. Menotti, M. Aoubala, P. Dubreuil, and G. Campadelli-Fiume, Proc. Natl. Acad. Sci. USA 95:15700, 1998). Using biosensor analysis, we measured the affinity of binding of go from HSV strains KOS and rid1 to two forms of HveC. Soluble gDs from the KOS strain of HSV-I had the same affinity for HveC(346t) and HveC(143t). The mutant gD(rid1t) had an increased affinity for HveC(346t) and HveC(143t) due to a faster rate of complex formation. Interestingly, we found that HveC(346t) was a tetramer in solution, whereas HveC(143t) and HveC(245t) formed dimers, suggesting a role for the third immunoglobulin-like domain of HveC in oligomerization. In addition, the stoichiometry between gD and HveC appeared to be influenced by the level of HveC oligomerization.
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页码:8127 / 8137
页数:11
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