title: Study of a novel hypervariable region in hepatitis C virus (HCV) E2 envelope glycoprotein.
abstract: A large share of hepatitis C virus amino acid sequence variation is concentrated within two hypervariable regions located at the N-terminus of the E2 envelope glycoprotein (HVR1 and HVR2). Interhost and intrahost comparison of 391 E2 sequences derived from 17 subjects infected with HCV using amino acid entropy revealed clustering of amino acid variability at a third site (residues 431-466), which was termed HVR3. Genetic distance analysis supported the division of HVR3 into three subdomains (HVR3a, HVR3b, and HVR3c). Study of synonymous and nonsynonymous nucleic acid substitutions confirmed that HVR3a was subjected to strong intrahost-selective pressure. Physicochemical and antigenicity predictions, conservation of key residues, and molecular modeling were concordant with one another and further validated the proposed organization of HVR3. Taken together, these results are suggestive of a role for HVR3 in cell surface receptor binding and viral entry akin to that proposed for HVR1 and HVR2.
authors.affiliation: Unité d'immunopathologie virale, Centre de recherche du CHU mère-enfant Sainte-Justine, Montreal, Quebec, Canada H3T 1C5.
authors.forename: Myriam
authors.initials: M
authors.lastname: Troesch
authors.forename: Isabelle
authors.initials: I
authors.lastname: Meunier
authors.forename: Pascal
authors.initials: P
authors.lastname: Lapierre
authors.forename: Normand
authors.initials: N
authors.lastname: Lapointe
authors.forename: Fernando
authors.initials: F
authors.lastname: Alvarez
authors.forename: Marc
authors.initials: M
authors.lastname: Boucher
authors.forename: Hugo
authors.initials: H
authors.lastname: Soudeyns
mesh_terms: D001483:Base Sequence; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004279:DNA, Viral / Q000235:genetics; D005260:Female; D005814:Genes, Viral; D014644:Genetic Variation; D015658:HIV Infections / Q000150:complications; D015497:HIV-1; D016174:Hepacivirus / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification; D006526:Hepatitis C / Q000150:complications / Q000821:virology; D018936:Hepatitis C Antigens / Q000737:chemistry / Q000235:genetics; D006801:Humans; D008958:Models, Molecular; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000821:virology; D011487:Protein Conformation; D012641:Selection, Genetic; D014759:Viral Envelope Proteins / Q000737:chemistry / Q000235:genetics* / Q000276:immunology
chemical_list: D004279:DNA, Viral; D018936:Hepatitis C Antigens; D014759:Viral Envelope Proteins; C091015:glycoprotein E2, Hepatitis C virus