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Khrustalev VV, Kordyukova LV, Arutyunyan AM, Poboinev VV, Khrustaleva TA, Stojarov AN, Baratova LA, Sapon AS, Lugin VG. The cytoplasmic tail of influenza A/H1N1 virus hemagglutinin is β-structural. J Biomol Struct Dyn 2020; 40:4642-4661. [PMID: 33317396 DOI: 10.1080/07391102.2020.1860827] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Influenza A/H1N1 virus hemagglutinin (HA) is an integral type I glycoprotein that contains a large glycosylated ectodomain, a transmembrane domain, and a cytoplasmic tail (CT) of 10-14 amino acid residues. There are absolutely no data on the secondary or tertiary structure of the HA CT, which is important for virus pathogenesis. Three highly conserved cysteines are post-translationally modified by the attachment of fatty acid residues that pin the CT to the lipid membrane inside the virion. We applied circular dichroism (CD) and fluorescence spectroscopy analysis to examine four synthetic peptides corresponding to 14-15 C-terminal residues of H1 subtype HA (NH2-WMCSNGSLQCRICI-COOH; NH2-FWMCSNGSLQCRICI-COOH), with free or acetaminomethylated cysteines, in the reduced or non-reduced state, at various pH values and temperatures. The CD analysis detected the formation of a β-structure (30-65% according to the new BeStSel algorithm), in addition to an unstructured random coil, in every peptide in various conditions. It was completely or partially recognized as an antiparallel β-structure that was also confirmed by the multi-bounce Horizontal Attenuated Total Reflectance Fourier Transformed Infrared (HATR-FTIR) spectroscopy analysis. According to the experimental data, as well as 3 D modeling, we assume that the amino acid sequence corresponding to the HA CT may form a short antiparallel β-structure under the lipid membrane within a virion.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
| | - Larisa V Kordyukova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Alexander M Arutyunyan
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Victor V Poboinev
- Department of General Chemistry, Belarusian State Medical University, Minsk, Belarus
| | - Tatyana A Khrustaleva
- Biochemical group of the Multidisciplinary Diagnostic Laboratory, Institute of Physiology of the National Academy of Sciences of Belarus, Minsk, Belarus
| | - Aleksander N Stojarov
- Department of Radiation Medicine and Ecology, Belarusian State Medical University, Minsk, Belarus
| | - Lyudmila A Baratova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russia
| | - Alena S Sapon
- Center for Physical and Chemical Research Methods, Belarusian State Technological University, Minsk, Belarus
| | - Valery G Lugin
- Center for Physical and Chemical Research Methods, Belarusian State Technological University, Minsk, Belarus
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Kordyukova LV, Mintaev RR, Rtishchev AA, Kunda MS, Ryzhova NN, Abramchuk SS, Serebryakova MV, Khrustalev VV, Khrustaleva TA, Poboinev VV, Markushin SG, Voronina OL. Filamentous versus Spherical Morphology: A Case Study of the Recombinant A/WSN/33 (H1N1) Virus. Microsc Microanal 2020; 26:297-309. [PMID: 32036809 DOI: 10.1017/s1431927620000069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Influenza A virus is a serious human pathogen that assembles enveloped virions on the plasma membrane of the host cell. The pleiomorphic morphology of influenza A virus, represented by spherical, elongated, or filamentous particles, is important for the spread of the virus in nature. Using fixative protocols for sample preparation and negative staining electron microscopy, we found that the recombinant A/WSN/33 (H1N1) (rWSN) virus, a strain considered to be strictly spherical, may produce filamentous particles when amplified in the allantoic cavity of chicken embryos. In contrast, the laboratory WSN strain and the rWSN virus amplified in Madin-Darby canine kidney cells exhibited a spherical morphology. Next-generation sequencing (NGS) suggested a rare Ser126Cys substitution in the M1 protein of rWSN, which was confirmed by the mass spectrometric analysis. No structurally relevant substitutions were found by NGS in other proteins of rWSN. Bioinformatics algorithms predicted a neutral structural effect of the Ser126Cys mutation. The mrWSN_M1_126S virus generated after the introduction of the reverse Cys126Ser substitution exhibited a similar host-dependent partially filamentous phenotype. We hypothesize that a shortage of some as-yet-undefined cellular components involved in virion budding and membrane scission may result in the appearance of filamentous particles in the case of usually "nonfilamentous" virus strains.
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Affiliation(s)
- Larisa V Kordyukova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991Moscow, Russia
| | - Ramil R Mintaev
- Mechnikov Research Institute of Vaccine and Sera, 105064Moscow, Russia
- Federal State Budgetary Institution «Center for Strategic Planning and Management for Medical and Biological Health Risks», Ministry of Health, 119121Moscow, Russia
| | | | - Marina S Kunda
- N.F. Gamaleya National Research Center for Epidemiology and Microbiology, Ministry of Health, 123098Moscow, Russia
| | - Natalia N Ryzhova
- N.F. Gamaleya National Research Center for Epidemiology and Microbiology, Ministry of Health, 123098Moscow, Russia
| | - Sergei S Abramchuk
- Department of Chemistry, Lomonosov Moscow State University, 119234Moscow, Russia
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 119991Moscow, Russia
| | - Marina V Serebryakova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991Moscow, Russia
| | - Vladislav V Khrustalev
- Department of General Chemistry, Belarusian State Medical University, 220116Minsk, Belarus
| | - Tatyana A Khrustaleva
- Biochemical Group of the Multidisciplinary Diagnostic Laboratory, Institute of Physiology of the National Academy of Sciences of Belarus, 220072Minsk, Belarus
| | - Victor V Poboinev
- Department of General Chemistry, Belarusian State Medical University, 220116Minsk, Belarus
| | | | - Olga L Voronina
- N.F. Gamaleya National Research Center for Epidemiology and Microbiology, Ministry of Health, 123098Moscow, Russia
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