skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Identification and characterization of influenza variants resistant to a viral endonuclease inhibitor

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [3];  [4];  [1];  [2];  [3]; ORCiD logo [1];  [1];  [4];  [1];  [2]
  1. St. Jude Children's Research Hospital, Memphis, TN (United States). Dept. of Infectious Diseases
  2. St. Jude Children's Research Hospital, Memphis, TN (United States). Dept. of Structural Biology
  3. St. Jude Children's Research Hospital, Memphis, TN (United States). Dept. of Chemical Biology and Therapeutics
  4. SRI International, Menlo Park, CA (United States). Bioscience Division

The influenza endonuclease is an essential subdomain of the viral RNA polymerase. It processes host pre-mRNAs to serve as primers for viral mRNA and is an attractive target for antiinfluenza drug discovery. Compound L-742,001 is a prototypical endonuclease inhibitor, and we found that repeated passaging of influenza virus in the presence of this drug did not lead to the development of resistant mutant strains. Reduced sensitivity to L-742,001 could only be induced by creating point mutations via a random mutagenesis strategy. Furthermore, these mutations mapped to the endonuclease active site where they can directly impact inhibitor binding. Engineered viruses containing the mutations showed resistance to L-742,001 both in vitro and in vivo, with only a modest reduction in fitness. Introduction of the mutations into a second virus also increased its resistance to the inhibitor. When using the isolated wild-type and mutant endonuclease domains, we used kinetics, inhibitor binding and crystallography to characterize how the two most significant mutations elicit resistance to L-742,001. These studies lay the foundation for the development of a new class of influenza therapeutics with reduced potential for the development of clinical endonuclease inhibitor-resistant influenza strains.

Research Organization:
St. Jude Children's Research Hospital, Memphis, TN (United States); SRI International, Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; National Inst. of Health (NIH) (United States); American Lebanese Syrian Associated Charities (ALSAC) (United States)
Grant/Contract Number:
W‐31‐109‐Eng‐38; AI098757; CA21765; HHSN266200700005C; HHSN272201400006C
OSTI ID:
1247357
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 113, Issue 13; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

References (55)

Initial Genetic Characterization of the 1918 "Spanish" Influenza Virus journal March 1997
WHO recommendations for the viruses used in the 2013–2014 Northern Hemisphere influenza vaccine: Epidemiology, antigenic and genetic characteristics of influenza A(H1N1)pdm09, A(H3N2) and B influenza viruses collected from October 2012 to January 2013 journal August 2014
Identification of Influenza Endonuclease Inhibitors Using a Novel Fluorescence Polarization Assay journal January 2012
Automated minimization of steric clashes in protein structures journal November 2010
Overview of the CCP 4 suite and current developments journal March 2011
Combination chemotherapy, a potential strategy for reducing the emergence of drug-resistant influenza A variants journal July 2006
Antigenic and Genetic Characteristics of Swine-Origin 2009 A(H1N1) Influenza Viruses Circulating in Humans journal May 2009
Mutational Analysis of the Binding Pockets of the Diketo Acid Inhibitor L-742,001 in the Influenza Virus PA Endonuclease journal July 2013
Endonuclease substrate selectivity characterized with full-length PA of influenza A virus polymerase journal November 2012
Therapeutics for HIV-1 reactivation from latency journal August 2013
Some Problems of Modern Influenza Prophylaxis with Live Vaccine journal April 1977
Characterization of PA-N terminal domain of Influenza A polymerase reveals sequence specific RNA cleavage journal July 2013
Coot model-building tools for molecular graphics journal November 2004
Brief literature review for the WHO global influenza research agenda - highly pathogenic avian influenza H5N1 risk in humans journal August 2013
A DNA transfection system for generation of influenza A virus from eight plasmids journal May 2000
Resistance of influenza viruses to neuraminidase inhibitors — a review journal July 2000
Understanding the hepatitis C virus life cycle paves the way for highly effective therapies journal July 2013
Oseltamivir-Resistant Influenza Viruses A (H1N1), Norway, 2007–08 journal February 2009
The influenza virus RNA synthesis machine: Advances in its structure and function journal March 2011
The epidemiology and spread of drug resistant human influenza viruses journal October 2014
The cap-snatching endonuclease of influenza virus polymerase resides in the PA subunit journal February 2009
Metal-Chelating 2-Hydroxyphenyl Amide Pharmacophore for Inhibition of Influenza Virus Endonuclease journal November 2013
The polymerase complex genes contribute to the high virulence of the human H5N1 influenza virus isolate A/Vietnam/1203/04 journal March 2006
Structural Analysis of Specific Metal Chelating Inhibitor Binding to the Endonuclease Domain of Influenza pH1N1 (2009) Polymerase journal August 2012
Structural and Biochemical Basis for Development of Influenza Virus Inhibitors Targeting the PA Endonuclease journal August 2012
Experimental adaptation of an influenza H5 HA confers respiratory droplet transmission to a reassortant H5 HA/H1N1 virus in ferrets journal May 2012
The molecular basis of the specific anti-influenza action of amantadine. journal November 1985
Airborne Transmission of Influenza A/H5N1 Virus Between Ferrets journal June 2012
Cochrane re-arranged: Support for policies to vaccinate elderly people against influenza journal December 2013
Phenyl Substituted 4-Hydroxypyridazin-3(2 H )-ones and 5-Hydroxypyrimidin-4(3 H )-ones: Inhibitors of Influenza A Endonuclease journal September 2014
Influenza Research Database: an integrated bioinformatics resource for influenza research and surveillance: Influenza Research Database journal January 2012
Mortality Associated With Influenza and Respiratory Syncytial Virus in the United States journal January 2003
A unique cap(m7GpppXm)-dependent influenza virion endonuclease cleaves capped RNAs to generate the primers that initiate viral RNA transcription journal March 1981
In Vitro Generation of Neuraminidase Inhibitor Resistance in A(H5N1) Influenza Viruses journal August 2009
Overview of the CCP4 suite and current developments. text January 2011
Automated minimization of steric clashes in protein structures text January 2011
Structural insight into cap-snatching and RNA synthesis by influenza polymerase journal November 2014
Efficacy and effectiveness of influenza vaccines: a systematic review and meta-analysis journal January 2012
NMRPipe: A multidimensional spectral processing system based on UNIX pipes journal November 1995
PA subunit of RNA polymerase as a promising target for anti-influenza virus agents journal June 2008
Structure of influenza A polymerase bound to the viral RNA promoter journal November 2014
A trade-off between neutrality and adaptability limits the optimization of viral quasispecies journal November 2009
Surveillance of illness associated with pandemic (H1N1) 2009 virus infection among adults using a global clinical site network approach: The INSIGHT FLU 002 and FLU 003 studies journal July 2011
3-Hydroxyquinolin-2(1 H )-ones As Inhibitors of Influenza A Endonuclease journal May 2013
Mutational and Metal Binding Analysis of the Endonuclease Domain of the Influenza Virus Polymerase PA Subunit journal June 2010
Structural and computational study on inhibitory compounds for endonuclease activity of influenza virus polymerase journal September 2015
The RNA polymerase of influenza A virus: mechanisms of viral transcription and replication journal January 2013
Multi-functionality of a tryptophan residue conserved in substrate-binding groove of GH19 chitinases journal January 2021
Inhibition of cap (m7GpppXm)-dependent endonuclease of influenza virus by 4-substituted 2,4-dioxobutanoic acid compounds. journal December 1994
Anti-influenza virus activities of 4-substituted 2,4-dioxobutanoic acid inhibitors. journal May 1996
Epidemiology of Human Infections with Avian Influenza A(H7N9) Virus in China journal February 2014
Crystal structure of an avian influenza polymerase PAN reveals an endonuclease active site journal February 2009
Evolution and ecology of influenza A viruses journal March 1992
Characterization of mutants of influenza A virus selected with the neuraminidase inhibitor 4-guanidino-Neu5Ac2en. journal January 1996
[20] Processing of X-ray diffraction data collected in oscillation mode book January 1997

Cited By (11)

Identification of the I38T PA Substitution as a Resistance Marker for Next-Generation Influenza Virus Endonuclease Inhibitors journal April 2018
Antiviral Effects of Black Raspberry (Rubus coreanus) Seed and Its Gallic Acid against Influenza Virus Infection journal June 2016
Susceptibility of Influenza Viruses to the Novel Cap-Dependent Endonuclease Inhibitor Baloxavir Marboxil journal December 2018
A Novel Endonuclease Inhibitor Exhibits Broad-Spectrum Anti-Influenza Virus Activity In Vitro journal July 2016
Characterization of influenza virus variants induced by treatment with the endonuclease inhibitor baloxavir marboxil journal June 2018
The Influenza Virus Polymerase Complex: An Update on Its Structure, Functions, and Significance for Antiviral Drug Design: THE INFLUENZA VIRUS POLYMERASE COMPLEX journal August 2016
Aryl and Arylalkyl Substituted 3‐Hydroxypyridin‐2(1 H )‐ones: Synthesis and Evaluation as Inhibitors of Influenza A Endonuclease journal May 2019
Protein-Structure Assisted Optimization of 4,5-Dihydroxypyrimidine-6-Carboxamide Inhibitors of Influenza Virus Endonuclease journal December 2017
Complete Genome Sequence of an Avian H1N1 Influenza Virus Strain Isolated from Migratory Birds in the Republic of Korea journal May 2017
mSphere of Influence: Resolution of the Structure of an Influenza Virus Polymerase Is a Game Changer journal August 2019
Progress of small molecular inhibitors in the development of anti-influenza virus agents journal January 2017