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Journal of General Virology header logo Journal of General Virology

Volume 80, Issue 6

N- and C-terminal external domains of human herpesvirus-6 glycoprotein H affect a fusion-associated conformation mediated by glycoprotein L binding the N terminus No Access

Abstract

Human herpesvirus-6 (HHV-6), like other betaherpesviruses, shows cell fusion with wild-type strains, and this cellular spread is mediated by the glycoprotein gH/gL complex. Anti-fusion monoclonal antibodies (MAbs) specific for HHV-6 glycoprotein gH inhibit infection and prevent cellular spread by syncytia formation. Reactivity of these MAbs with gH deletion mutants suggests a conserved C-terminal fusion-associated domain. A conserved motif here has an N-glycosylation site and characteristics of a beta turn. Motif deletion abrogated MAb recognition while co-expression with glycoprotein gL restored this conformational epitope, indicating the importance of folding and not glycosylation at this site. Our previous studies showed gL binding to gH at an N-terminal domain specific for betaherpesviruses. To further examine the function of this N-terminal domain, a betaherpesvirus-specific motif was deleted. This mutant gH still bound gL, and was recognized by the anti-fusion MAbs; however, recognition was now primarily in the immature form and reduced during processing to the mature form. A model is discussed whereby gL binding gH at the N-terminal domain acts to draw together the C-terminal extracellular domain and this interaction affects a functional conformation during glycoprotein maturation.

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© Journal of General Virology 1999
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1999-06-01
2025-05-19
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/content/journal/jgv/10.1099/0022-1317-80-6-1485
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N- and C-terminal external domains of human herpesvirus-6 glycoprotein H affect a fusion-associated conformation mediated by glycoprotein L binding the N terminus
J. Gen. Virol. 80, 1485 (1999); https://doi.org/10.1099/0022-1317-80-6-1485
/content/journal/jgv/10.1099/0022-1317-80-6-1485
/content/journal/jgv/10.1099/0022-1317-80-6-1485
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