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Liu X, Ding L, Yuan J, Liao J, Duan L, Wang W, Tan W, Yu W, Zhou B, Chen X, Yang Z. Identification of a Novel Universal Potential Epitope on the Cytoplasmic Tail of H7N9 Virus Hemagglutinin. Virol Sin 2019; 34:334-337. [PMID: 31016481 DOI: 10.1007/s12250-019-00110-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 03/05/2019] [Indexed: 11/30/2022] Open
Affiliation(s)
- Xi Liu
- Department of Infectious Diseases, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, 51900, China
| | - Li Ding
- Department of Infectious Diseases, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, 51900, China
| | - Jing Yuan
- Department of Infectious Diseases, The Third People's Hospital of Shenzhen (The Second Affiliated Hospital of Southern University of Science and Technology), Shenzhen, 518000, China
| | - Jian Liao
- Shenzhen Key Laboratory of Infection and Immunity, The Third People's Hospital of Shenzhen (The Second Affiliated Hospital of Southern University of Science and Technology), Shenzhen, 518000, China
| | - Lian Duan
- Shenzhen Key Laboratory of Infection and Immunity, The Third People's Hospital of Shenzhen (The Second Affiliated Hospital of Southern University of Science and Technology), Shenzhen, 518000, China
| | - Wenfei Wang
- Department of Pathogen Biology, School of Medicine, Shenzhen University, Shenzhen, 518000, China
| | - Weiguo Tan
- Lab for Tuberculosis Research, Shenzhen Center for Chronic Disease Control, Shenzhen, 518020, China
| | - Weiye Yu
- Lab for Tuberculosis Research, Shenzhen Center for Chronic Disease Control, Shenzhen, 518020, China
| | - Boping Zhou
- Longhua Branch of Shenzhen People's Hospital, Shenzhen, 518000, China
| | - Xinchun Chen
- Department of Pathogen Biology, School of Medicine, Shenzhen University, Shenzhen, 518000, China
| | - Zheng Yang
- Lab for Tuberculosis Research, Shenzhen Center for Chronic Disease Control, Shenzhen, 518020, China. .,Shenzhen Key Laboratory of Infection and Immunity, The Third People's Hospital of Shenzhen (The Second Affiliated Hospital of Southern University of Science and Technology), Shenzhen, 518000, China.
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The Influenza B Virus Hemagglutinin Head Domain Is Less Tolerant to Transposon Mutagenesis than That of the Influenza A Virus. J Virol 2018; 92:JVI.00754-18. [PMID: 29899093 DOI: 10.1128/jvi.00754-18] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 06/04/2018] [Indexed: 11/20/2022] Open
Abstract
Influenza A and B viruses can continuously evade humoral immune responses by developing mutations in the globular head of the hemagglutinin (HA) that prevent antibody binding. However, the influenza B virus HA over time displays less antigenic variation despite being functionally and structurally similar to the influenza A virus HA. To determine if the influenza B virus HA is under constraints that limit its antigenic variation, we performed a transposon screen to compare the mutational tolerance of the currently circulating influenza A virus HAs (H1 and H3 subtypes) and influenza B virus HAs (B/Victoria87 and B/Yamagata88 antigenic lineages). A library of insertional mutants for each HA was generated and deep sequenced after passaging to determine where insertions were tolerated in replicating viruses. The head domains of both viruses tolerated transposon mutagenesis, but the influenza A virus head was more tolerant to insertions than the influenza B virus head domain. Furthermore, all five of the known antigenic sites of the influenza A virus HA were tolerant of 15 nucleotide insertions, while insertions were detected in only two of the four antigenic sites in the influenza B virus head domain. Our analysis demonstrated that the influenza B virus HA is inherently less tolerant of transposon-mediated insertions than the influenza A virus HA. The reduced insertional tolerance of the influenza B virus HA may reveal genetic restrictions resulting in a lower capacity for antigenic evolution.IMPORTANCE Influenza viruses cause seasonal epidemics and result in significant human morbidity and mortality. Influenza viruses persist in the human population through generating mutations in the hemagglutinin head domain that prevent antibody recognition. Despite the similar selective pressures on influenza A and B viruses, influenza A virus displays a higher rate and breadth of antigenic variability than influenza B virus. A transposon mutagenesis screen was used to examine if the reduced antigenic variability of influenza B virus was due to inherent differences in mutational tolerance. This study demonstrates that the influenza A virus head domain and the individual antigenic sites targeted by humoral responses are more tolerant to insertions than those of influenza B virus. This finding sheds light on the genetic factors controlling the antigenic evolution of influenza viruses.
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Kordyukova L. Structural and functional specificity of Influenza virus haemagglutinin and paramyxovirus fusion protein anchoring peptides. Virus Res 2017; 227:183-199. [DOI: 10.1016/j.virusres.2016.09.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 09/21/2016] [Accepted: 09/23/2016] [Indexed: 02/08/2023]
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Siche S, Brett K, Möller L, Kordyukova LV, Mintaev RR, Alexeevski AV, Veit M. Two Cytoplasmic Acylation Sites and an Adjacent Hydrophobic Residue, but No Other Conserved Amino Acids in the Cytoplasmic Tail of HA from Influenza A Virus Are Crucial for Virus Replication. Viruses 2015; 7:6458-75. [PMID: 26670246 PMCID: PMC4690873 DOI: 10.3390/v7122950] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Revised: 11/24/2015] [Accepted: 12/03/2015] [Indexed: 02/06/2023] Open
Abstract
Recruitment of the matrix protein M1 to the assembly site of the influenza virus is thought to be mediated by interactions with the cytoplasmic tail of hemagglutinin (HA). Based on a comprehensive sequence comparison of all sequences present in the database, we analyzed the effect of mutating conserved residues in the cytosol-facing part of the transmembrane region and cytoplasmic tail of HA (A/WSN/33 (H1N1) strain) on virus replication and morphology of virions. Removal of the two cytoplasmic acylation sites and substitution of a neighboring isoleucine by glutamine prevented rescue of infectious virions. In contrast, a conservative exchange of the same isoleucine, non-conservative exchanges of glycine and glutamine, deletion of the acylation site at the end of the transmembrane region and shifting it into the tail did not affect virus morphology and had only subtle effects on virus growth and on the incorporation of M1 and Ribo-Nucleoprotein Particles (RNPs). Thus, assuming that essential amino acids are conserved between HA subtypes we suggest that, besides the two cytoplasmic acylation sites (including adjacent hydrophobic residues), no other amino acids in the cytoplasmic tail of HA are indispensable for virus assembly and budding.
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Affiliation(s)
- Stefanie Siche
- Institute of Virology, Faculty of Veterinary Medicine, Freie Universität Berlin, 14163 Berlin, Germany.
| | - Katharina Brett
- Institute of Virology, Faculty of Veterinary Medicine, Freie Universität Berlin, 14163 Berlin, Germany.
| | - Lars Möller
- Robert Koch Institute, Advanced Light and Electron Microscopy (ZBS4), Nordufer 20, 13353 Berlin, Germany.
| | - Larisa V Kordyukova
- A.N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia.
| | - Ramil R Mintaev
- A.N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia.
- I.I. Mechnikov Research Institute of Vaccines and Sera, Russian Academy of Medical Sciences, 105064 Moscow, Russia.
| | - Andrei V Alexeevski
- A.N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia.
- Department of Bioengineering and Bioinformatics, Lomonosov Moscow State University, 119991 Moscow, Russia.
| | - Michael Veit
- Institute of Virology, Faculty of Veterinary Medicine, Freie Universität Berlin, 14163 Berlin, Germany.
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Cold adaptation improves the growth of seasonal influenza B vaccine viruses. Vaccine 2014; 32:2474-9. [DOI: 10.1016/j.vaccine.2014.02.079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 02/02/2014] [Accepted: 02/26/2014] [Indexed: 11/21/2022]
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