Selection of influenza A and B viruses for resistance to 4-guanidino-Neu5Ac2en in cell culture.
The reassortant influenza viruses, A/NWS-G70c with N9 neuraminidase (NA) and B/HK/8/73 (HG) with B/Lee/40 NA, were selected for resistance to 4-guanidino-Neu5Ac2en (4-GuDANA) by passaging the virus in stepwise increases in the concentration of 4-GuDANA. In the NA of resistant viruses, the absolutely conserved Glu 119, which lies in a pocket beneath the active site of the enzyme and interacts with the guanidinium moiety of 4-GuDANA, was changed to Gly. The mutant NA was >200-fold more resistant to 4-GuDANA than was the wild-type enzyme. During 72 h in cell culture, resistant A and B viruses displayed much less NA activity than did wild-type viruses but did undergo multicycle replication. While emergence of resistance to 4-GuDANA has not been observed in vivo, these results demonstrate that the development of resistance is possible and can be mediated by a single amino acid change in the active site of the viral NA.
Colacino
J M
JM
Lilly Research Laboratories, Indianapolis, Indiana 46285, USA.
Laver
W G
WG
Air
G M
GM
D000998:Antiviral Agents / Q000494:pharmacology*; D002478:Cells, Cultured; D004351:Drug Resistance; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D006146:Guanidines; D009980:Influenza A virus / Q000187:drug effects; D009981:Influenza B virus / Q000187:drug effects*; D009154:Mutation; D009439:Neuraminidase / Q000037:antagonists & inhibitors* / Q000235:genetics; D011714:Pyrans; D012794:Sialic Acids / Q000494:pharmacology*; D053243:Zanamivir
D000998:Antiviral Agents; D004791:Enzyme Inhibitors; D006146:Guanidines; D011714:Pyrans; D012794:Sialic Acids; D009439:Neuraminidase; D053243:Zanamivir