title: A potent peptidomimetic inhibitor of HSV ribonucleotide reductase with antiviral activity in vivo.
abstract: Herpes simplex viruses (HSV) types 1 and 2 encode their own ribonucleotide reductases (RNRs) (EC 1.17.4.1) to convert ribonucleoside diphosphates into the corresponding deoxyribonucleotides. Like other iron-dependent RNRs, the viral enzyme is formed by the reversible association of two distinct homodimeric subunits. The carboxy terminus of the RNR small subunit (R2) is critical for subunit association and synthetic peptides containing these amino-acid sequences selectively inhibit the viral enzyme by preventing subunit association. Increasing evidence indicates that the HSV RNR is important for virulence and reactivation from latency. Previously, we reported on the design of HSV RNR inhibitors with enhanced inhibitory potency in vitro. We now report on BILD 1263, which to our knowledge is the first HSV RNR subunit-association inhibitor with antiviral activity in vivo. This compound suppresses the replication of HSV-1, HSV-2 and acyclovir-resistant HSV strains in cell culture, and also strongly potentiates the antiviral activity of acyclovir. Most importantly, its anti-herpetic activity is shown in a murine ocular model of HSV-1-induced keratitis, providing an example of potent nonsubstrate-based antiviral agents that prevent protein-protein interactions. The unique antiviral properties of BILD 1263 may lead to the design of new strategies to treat herpesvirus infections in humans.
authors.affiliation: Bio-Méga/Boehringer Ingelheim Research Inc., Laval, Québec, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Liuzzi
authors.forename: R
authors.initials: R
authors.lastname: Déziel
authors.forename: N
authors.initials: N
authors.lastname: Moss
authors.forename: P
authors.initials: P
authors.lastname: Beaulieu
authors.forename: A M
authors.initials: AM
authors.lastname: Bonneau
authors.forename: C
authors.initials: C
authors.lastname: Bousquet
authors.forename: J G
authors.initials: JG
authors.lastname: Chafouleas
authors.forename: M
authors.initials: M
authors.lastname: Garneau
authors.forename: J
authors.initials: J
authors.lastname: Jaramillo
authors.forename: R L
authors.initials: RL
authors.lastname: Krogsrud
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000998:Antiviral Agents / Q000737:chemistry / Q000494:pharmacology*; D002460:Cell Line; D006224:Cricetinae; D004195:Disease Models, Animal; D005260:Female; D018259:Herpesvirus 1, Human / Q000187:drug effects* / Q000201:enzymology; D018258:Herpesvirus 2, Human / Q000187:drug effects* / Q000201:enzymology; D007635:Keratitis, Dendritic / Q000188:drug therapy; D051379:Mice; D008807:Mice, Inbred BALB C; D018716:Molecular Mimicry; D008969:Molecular Sequence Data; D009842:Oligopeptides / Q000494:pharmacology*; D012262:Ribonucleoside Diphosphate Reductase / Q000037:antagonists & inhibitors*; D012265:Ribonucleotides / Q000378:metabolism; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000998:Antiviral Agents; C090897:BILD 1263; D009842:Oligopeptides; D012265:Ribonucleotides; D012262:Ribonucleoside Diphosphate Reductase