Mutagenic analysis of herpes simplex virus type 1 glycoprotein L reveals the importance of an arginine-rich region for function.
Herpes simplex virus type 1 (HSV-1) glycoproteins H and L (gH and gL) are required for virus-induced membrane fusion. Expression of gH at the virion or infected cell surface is mediated by the chaperone-like activity of gL. We have previously shown that a region between amino acids 155 and 161 is critical for gL chaperone-like activity. Here, we conducted Ala substitution mutagenesis of residues in this region and found that substitution of Cys160, Arg156, Arg158, or Arg156/158/159 with Ala resulted in a gL mutant that bound gH but displayed a reduced ability in gH trafficking and membrane fusion. Substitution of Arg156 with another positively charged amino acid, Lys, restored function. Substitution of Arg158 with Lys restored function in gH trafficking and cell fusion but not virus entry. These results indicate that an arginine-rich region of gL is critical for function.
Klyachkin
Yuri M
YM
University of Kentucky, Department of Microbiology, Immunology, and Molecular Genetics, 800 Rose St., UKMC MS423, Lexington, KY 40536-0298, USA.
Geraghty
Robert J
RJ
D019943:Amino Acid Substitution / Q000235:genetics; D004279:DNA, Viral / Q000235:genetics*; D018259:Herpesvirus 1, Human / Q000235:genetics / Q000502:physiology*; D018832:Molecular Chaperones / Q000235:genetics / Q000378:metabolism*; D016297:Mutagenesis, Site-Directed; D017434:Protein Structure, Tertiary; D021381:Protein Transport; D014759:Viral Envelope Proteins / Q000235:genetics / Q000378:metabolism*; D053586:Virus Internalization
D004279:DNA, Viral; D018832:Molecular Chaperones; D014759:Viral Envelope Proteins; C044200:glycoprotein H, herpes simplex virus type 1; C077407:glycoprotein L, Human herpesvirus 1