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F Nahhas A, F Nahhas A, J Webster T. Nanoscale pathogens treated with nanomaterial-like peptides: a platform technology appropriate for future pandemics. Nanomedicine (Lond) 2021; 16:1237-1254. [PMID: 33988037 PMCID: PMC8120868 DOI: 10.2217/nnm-2020-0447] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 03/29/2021] [Indexed: 01/13/2023] Open
Abstract
Viral infections are historically very difficult to treat. Although imperfect and time-consuming to develop, we do have some conventional vaccine and therapeutic approaches to stop viral spreading. Most importantly, all of this takes significant time while viruses continue to wreak havoc on our healthcare system. Furthermore, viral infections are accompanied by a weakened immune system which is often overlooked in antiviral drug strategies and requires additional drug development. In this review, for the first time, we touch on some promising alternative approaches to treat viral infections, specifically those focused on the use of platform nanomaterials with antiviral peptides. In doing so, this review presents a timely discussion of how we need to change our old way of treating viruses into one that can quickly meet the demands of COVID-19, as well as future pandemic-causing viruses, which will come.
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Affiliation(s)
- Alaa F Nahhas
- Biochemistry Department, College of Science, King Abdulaziz University, Jeddah 21589, KSA
| | - Alrayan F Nahhas
- Biochemistry Department, College of Science, King Abdulaziz University, Jeddah 21589, KSA
| | - Thomas J Webster
- Department of Chemical Engineering, College of Engineering, Northeastern University, Boston, MA 02115, USA
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2
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Yang C, Pan X, Huang Y, Cheng C, Xu X, Wu Y, Xu Y, Shang W, Niu X, Wan Y, Li Z, Zhang R, Liu S, Xiao G, Xu W. Drug Repurposing of Itraconazole and Estradiol Benzoate against COVID-19 by Blocking SARS-CoV-2 Spike Protein-Mediated Membrane Fusion. ADVANCED THERAPEUTICS 2021; 4:2000224. [PMID: 33786369 PMCID: PMC7994988 DOI: 10.1002/adtp.202000224] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 12/31/2020] [Indexed: 12/12/2022]
Abstract
SARS-CoV-2 caused the emerging epidemic of coronavirus disease in 2019 (COVID-19). To date, there are more than 82.9 million confirmed cases worldwide, there is no clinically effective drug against SARS-CoV-2 infection. The conserved properties of the membrane fusion domain of the spike (S) protein across SARS-CoV-2 make it a promising target to develop pan-CoV therapeutics. Herein, two clinically approved drugs, Itraconazole (ITZ) and Estradiol benzoate (EB), are found to inhibit viral entry by targeting the six-helix (6-HB) fusion core of SARS-CoV-2 S protein. Further studies shed light on the mechanism that ITZ and EB can interact with the heptad repeat 1 (HR1) region of the spike protein, to present anti-SARS-CoV-2 infections in vitro, indicating they are novel potential therapeutic remedies for COVID-19 treatment. Furthermore, ITZ shows broad-spectrum activity targeting 6-HB in the S2 subunit of SARS-CoV and MERS-CoV S protein, inspiring that ITZ have the potential for development as a pan-coronavirus fusion inhibitor.
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Affiliation(s)
- Chan Yang
- School of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou510515China
| | | | - Yuan Huang
- School of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou510515China
| | - Chen Cheng
- School of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou510515China
| | - Xinfeng Xu
- School of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou510515China
| | - Yan Wu
- Chinese Academy of SciencesWuhan430071China
| | - Yunxia Xu
- Guangzhou Eighth People's HospitalGuangzhou Medical UniversityGuangzhou510000China
| | | | - Xiaoge Niu
- School of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou510515China
| | - Yihong Wan
- School of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou510515China
| | - Zhaofeng Li
- School of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou510515China
| | - Rong Zhang
- School of Basic Medical SciencesFudan UniversityShanghai200433China
| | - Shuwen Liu
- School of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou510515China
| | | | - Wei Xu
- School of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou510515China
- Guangzhou Eighth People's HospitalGuangzhou Medical UniversityGuangzhou510000China
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3
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Vougogiannopoulou K, Corona A, Tramontano E, Alexis MN, Skaltsounis AL. Natural and Nature-Derived Products Targeting Human Coronaviruses. Molecules 2021; 26:448. [PMID: 33467029 PMCID: PMC7831024 DOI: 10.3390/molecules26020448] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 01/12/2021] [Accepted: 01/13/2021] [Indexed: 01/18/2023] Open
Abstract
The ongoing pandemic of severe acute respiratory syndrome (SARS), caused by the SARS-CoV-2 human coronavirus (HCoV), has brought the international scientific community before a state of emergency that needs to be addressed with intensive research for the discovery of pharmacological agents with antiviral activity. Potential antiviral natural products (NPs) have been discovered from plants of the global biodiversity, including extracts, compounds and categories of compounds with activity against several viruses of the respiratory tract such as HCoVs. However, the scarcity of natural products (NPs) and small-molecules (SMs) used as antiviral agents, especially for HCoVs, is notable. This is a review of 203 publications, which were selected using PubMed/MEDLINE, Web of Science, Scopus, and Google Scholar, evaluates the available literature since the discovery of the first human coronavirus in the 1960s; it summarizes important aspects of structure, function, and therapeutic targeting of HCoVs as well as NPs (19 total plant extracts and 204 isolated or semi-synthesized pure compounds) with anti-HCoV activity targeting viral and non-viral proteins, while focusing on the advances on the discovery of NPs with anti-SARS-CoV-2 activity, and providing a critical perspective.
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Affiliation(s)
- Konstantina Vougogiannopoulou
- Department of Pharmacognosy and Natural Products Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece;
| | - Angela Corona
- Department of Life and Environmental Sciences, University of Cagliari, Biomedical Section, Laboratory of Molecular Virology, E block, Cittadella Universitaria di Monserrato, SS55409042 Monserrato, Italy; (A.C.); (E.T.)
| | - Enzo Tramontano
- Department of Life and Environmental Sciences, University of Cagliari, Biomedical Section, Laboratory of Molecular Virology, E block, Cittadella Universitaria di Monserrato, SS55409042 Monserrato, Italy; (A.C.); (E.T.)
| | - Michael N. Alexis
- Molecular Endocrinology Team, Inst of Chemical Biology, National Hellenic Research Foundation (NHRF), 48 Vassileos Constantinou Ave., 11635 Athens, Greece;
| | - Alexios-Leandros Skaltsounis
- Department of Pharmacognosy and Natural Products Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece;
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4
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Wenzhong L, Hualan L. COVID-19: the CaMKII-like system of S protein drives membrane fusion and induces syncytial multinucleated giant cells. Immunol Res 2021; 69:496-519. [PMID: 34410575 PMCID: PMC8374125 DOI: 10.1007/s12026-021-09224-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 07/24/2021] [Indexed: 02/07/2023]
Abstract
The SARS-CoV-2 S protein on the membrane of infected cells can promote receptor-dependent syncytia formation, relating to extensive tissue damage and lymphocyte elimination. In this case, it is challenging to obtain neutralizing antibodies and prevent them through antibodies effectively. Considering that, in the current study, structural domain search methods are adopted to analyze the SARS-CoV-2 S protein to find the fusion mechanism. The results show that after the EF-hand domain of S protein bound to calcium ions, S2 protein had CaMKII protein activities. Besides, the CaMKII_AD domain of S2 changed S2 conformation, facilitating the formation of HR1-HR2 six-helix bundles. Apart from that, the Ca2+-ATPase of S2 pumped calcium ions from the virus cytoplasm to help membrane fusion, while motor structures of S drove the CaATP_NAI and CaMKII_AD domains to extend to the outside and combined the viral membrane and the cell membrane, thus forming a calcium bridge. Furthermore, the phospholipid-flipping-ATPase released water, triggering lipid mixing and fusion and generating fusion pores. Then, motor structures promoted fusion pore extension, followed by the cytoplasmic contents of the virus being discharged into the cell cytoplasm. After that, the membrane of the virus slid onto the cell membrane along the flowing membrane on the gap of the three CaATP_NAI. At last, the HR1-HR2 hexamer would fall into the cytoplasm or stay on the cell membrane. Therefore, the CaMKII_like system of S protein facilitated membrane fusion for further inducing syncytial multinucleated giant cells.
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Affiliation(s)
- Liu Wenzhong
- grid.412605.40000 0004 1798 1351School of Computer Science and Engineering, Sichuan University of Science & Engineering, Zigong, 643002 China ,grid.413041.30000 0004 1808 3369School of Life Science and Food Engineering, Yibin University, Yibin, 644000 China
| | - Li Hualan
- grid.413041.30000 0004 1808 3369School of Life Science and Food Engineering, Yibin University, Yibin, 644000 China
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Vilas Boas LCP, Campos ML, Berlanda RLA, de Carvalho Neves N, Franco OL. Antiviral peptides as promising therapeutic drugs. Cell Mol Life Sci 2019; 76:3525-3542. [PMID: 31101936 PMCID: PMC7079787 DOI: 10.1007/s00018-019-03138-w] [Citation(s) in RCA: 168] [Impact Index Per Article: 33.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 05/04/2019] [Accepted: 05/07/2019] [Indexed: 01/28/2023]
Abstract
While scientific advances have led to large-scale production and widespread distribution of vaccines and antiviral drugs, viruses still remain a major cause of human diseases today. The ever-increasing reports of viral resistance and the emergence and re-emergence of viral epidemics pressure the health and scientific community to constantly find novel molecules with antiviral potential. This search involves numerous different approaches, and the use of antimicrobial peptides has presented itself as an interesting alternative. Even though the number of antimicrobial peptides with antiviral activity is still low, they already show immense potential to become pharmaceutically available antiviral drugs. Such peptides can originate from natural sources, such as those isolated from mammals and from animal venoms, or from artificial sources, when bioinformatics tools are used. This review aims to shed some light on antimicrobial peptides with antiviral activities against human viruses and update the data about the already well-known peptides that are still undergoing studies, emphasizing the most promising ones that may become medicines for clinical use.
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Affiliation(s)
| | - Marcelo Lattarulo Campos
- Centro de Análises Bioquímicas e Proteômicas, Pós-graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, DF, 70790-160, Brazil
- Departamento de Botânica e Ecologia, Instituto de Biociências, Universidade Federal de Mato Grosso, Cuiabá, MT, 78060-900, Brazil
| | - Rhayfa Lorrayne Araujo Berlanda
- Centro de Análises Bioquímicas e Proteômicas, Pós-graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, DF, 70790-160, Brazil
| | - Natan de Carvalho Neves
- Centro de Análises Bioquímicas e Proteômicas, Pós-graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, DF, 70790-160, Brazil
| | - Octávio Luiz Franco
- Universidade de Brasília, Pós-Graduação em Patologia Molecular, Campus Darcy Ribeiro, Brasília, DF, 70910-900, Brazil.
- Centro de Análises Bioquímicas e Proteômicas, Pós-graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, DF, 70790-160, Brazil.
- S-Inova Biotech, Pós-graduação em Biotecnologia Universidade Católica Dom Bosco, Campo Grande, MS, 79117-900, Brazil.
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Xia S, Xu W, Wang Q, Wang C, Hua C, Li W, Lu L, Jiang S. Peptide-Based Membrane Fusion Inhibitors Targeting HCoV-229E Spike Protein HR1 and HR2 Domains. Int J Mol Sci 2018; 19:ijms19020487. [PMID: 29415501 PMCID: PMC5855709 DOI: 10.3390/ijms19020487] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 01/24/2018] [Accepted: 01/31/2018] [Indexed: 12/11/2022] Open
Abstract
Human coronavirus 229E (HCoV-229E) infection in infants, elderly people, and immunocompromised patients can cause severe disease, thus calling for the development of effective and safe therapeutics to treat it. Here we reported the design, synthesis and characterization of two peptide-based membrane fusion inhibitors targeting HCoV-229E spike protein heptad repeat 1 (HR1) and heptad repeat 2 (HR2) domains, 229E-HR1P and 229E-HR2P, respectively. We found that 229E-HR1P and 229E-HR2P could interact to form a stable six-helix bundle and inhibit HCoV-229E spike protein-mediated cell-cell fusion with IC50 of 5.7 and 0.3 µM, respectively. 229E-HR2P effectively inhibited pseudotyped and live HCoV-229E infection with IC50 of 0.5 and 1.7 µM, respectively. In a mouse model, 229E-HR2P administered intranasally could widely distribute in the upper and lower respiratory tracts and maintain its fusion-inhibitory activity. Therefore, 229E-HR2P is a promising candidate for further development as an antiviral agent for the treatment and prevention of HCoV-229E infection.
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Affiliation(s)
- Shuai Xia
- Key Laboratory of Medical Molecular Virology of MOE/MOH, School of Basic Medical Sciences & Shanghai Public Health Clinical Center, Fudan University, 130 Dong An Rd., Xuhui District, Shanghai 200032, China.
| | - Wei Xu
- Key Laboratory of Medical Molecular Virology of MOE/MOH, School of Basic Medical Sciences & Shanghai Public Health Clinical Center, Fudan University, 130 Dong An Rd., Xuhui District, Shanghai 200032, China.
| | - Qian Wang
- Key Laboratory of Medical Molecular Virology of MOE/MOH, School of Basic Medical Sciences & Shanghai Public Health Clinical Center, Fudan University, 130 Dong An Rd., Xuhui District, Shanghai 200032, China.
| | - Cong Wang
- Key Laboratory of Medical Molecular Virology of MOE/MOH, School of Basic Medical Sciences & Shanghai Public Health Clinical Center, Fudan University, 130 Dong An Rd., Xuhui District, Shanghai 200032, China.
| | - Chen Hua
- Key Laboratory of Medical Molecular Virology of MOE/MOH, School of Basic Medical Sciences & Shanghai Public Health Clinical Center, Fudan University, 130 Dong An Rd., Xuhui District, Shanghai 200032, China.
| | - Weihua Li
- Key Laboratory of Reproduction Regulation of National Population and Family Planning Commission, The Shanghai Institute of Planned Parenthood Research, Institute of Reproduction and Development, Fudan University, Shanghai 200032, China.
| | - Lu Lu
- Key Laboratory of Medical Molecular Virology of MOE/MOH, School of Basic Medical Sciences & Shanghai Public Health Clinical Center, Fudan University, 130 Dong An Rd., Xuhui District, Shanghai 200032, China.
| | - Shibo Jiang
- Key Laboratory of Medical Molecular Virology of MOE/MOH, School of Basic Medical Sciences & Shanghai Public Health Clinical Center, Fudan University, 130 Dong An Rd., Xuhui District, Shanghai 200032, China.
- Key Laboratory of Reproduction Regulation of National Population and Family Planning Commission, The Shanghai Institute of Planned Parenthood Research, Institute of Reproduction and Development, Fudan University, Shanghai 200032, China.
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, NY 10065, USA.
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Lu L, Liu Q, Zhu Y, Chan KH, Qin L, Li Y, Wang Q, Chan JFW, Du L, Yu F, Ma C, Ye S, Yuen KY, Zhang R, Jiang S. Structure-based discovery of Middle East respiratory syndrome coronavirus fusion inhibitor. Nat Commun 2014; 5:3067. [PMID: 24473083 PMCID: PMC7091805 DOI: 10.1038/ncomms4067] [Citation(s) in RCA: 293] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 12/04/2013] [Indexed: 01/12/2023] Open
Abstract
A novel human coronavirus, Middle East respiratory syndrome coronavirus (MERS-CoV), has caused outbreaks of a SARS-like illness with high case fatality rate. The reports of its person-to-person transmission through close contacts have raised a global concern about its pandemic potential. Here we characterize the six-helix bundle fusion core structure of MERS-CoV spike protein S2 subunit by X-ray crystallography and biophysical analysis. We find that two peptides, HR1P and HR2P, spanning residues 998-1039 in HR1 and 1251-1286 in HR2 domains, respectively, can form a stable six-helix bundle fusion core structure, suggesting that MERS-CoV enters into the host cell mainly through membrane fusion mechanism. HR2P can effectively inhibit MERS-CoV replication and its spike protein-mediated cell-cell fusion. Introduction of hydrophilic residues into HR2P results in significant improvement of its stability, solubility and antiviral activity. Therefore, the HR2P analogues have good potential to be further developed into effective viral fusion inhibitors for treating MERS-CoV infection.
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Affiliation(s)
- Lu Lu
- Key Laboratory of Medical Molecular Virology of Ministries of Education and Health, Shanghai Medical College and Institute of Medical Microbiology, Fudan University, Shanghai, 200032 China
| | - Qi Liu
- Key Laboratory of Medical Molecular Virology of Ministries of Education and Health, Shanghai Medical College and Institute of Medical Microbiology, Fudan University, Shanghai, 200032 China
| | - Yun Zhu
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101 China
| | - Kwok-Hung Chan
- Department of Microbiology, State Key Laboratory of Emerging Infectious Diseases, Carol Yu Centre for Infection, The University of Hong Kong, Pokfulam, Hong Kong
| | - Lili Qin
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101 China
| | - Yuan Li
- Key Laboratory of Medical Molecular Virology of Ministries of Education and Health, Shanghai Medical College and Institute of Medical Microbiology, Fudan University, Shanghai, 200032 China
| | - Qian Wang
- Key Laboratory of Medical Molecular Virology of Ministries of Education and Health, Shanghai Medical College and Institute of Medical Microbiology, Fudan University, Shanghai, 200032 China
| | - Jasper Fuk-Woo Chan
- Department of Microbiology, State Key Laboratory of Emerging Infectious Diseases, Carol Yu Centre for Infection, The University of Hong Kong, Pokfulam, Hong Kong
| | - Lanying Du
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, 10065 New York USA
| | - Fei Yu
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, 10065 New York USA
| | - Cuiqing Ma
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, 10065 New York USA
| | - Sheng Ye
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101 China
| | - Kwok-Yung Yuen
- Department of Microbiology, State Key Laboratory of Emerging Infectious Diseases, Carol Yu Centre for Infection, The University of Hong Kong, Pokfulam, Hong Kong
| | - Rongguang Zhang
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101 China
| | - Shibo Jiang
- Key Laboratory of Medical Molecular Virology of Ministries of Education and Health, Shanghai Medical College and Institute of Medical Microbiology, Fudan University, Shanghai, 200032 China
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, 10065 New York USA
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The first complete genome sequences of clinical isolates of human coronavirus 229E. Virus Genes 2012; 45:433-9. [PMID: 22926811 PMCID: PMC7088690 DOI: 10.1007/s11262-012-0807-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Accepted: 08/10/2012] [Indexed: 12/20/2022]
Abstract
Human coronavirus 229E has been identified in the mid-1960s, yet still only one full-genome sequence is available. This full-length sequence has been determined from the cDNA-clone Inf-1 that is based on the lab-adapted strain VR-740. Lab-adaptation might have resulted in genomic changes, due to insufficient pressure to maintain gene integrity of non-essential genes. We present here the first full-length genome sequence of two clinical isolates. Each encoded gene was compared to Inf-1. In general, little sequence changes were noted, most could be attributed to genetic drift, since the clinical isolates originate from 2009 to 2010 and VR740 from 1962. Hot spots of substitutions were situated in the S1 region of the Spike, the nucleocapsid gene, and the non-structural protein 3 gene, whereas several deletions were detected in the 3′UTR. Most notable was the difference in genome organization: instead of an ORF4A and ORF4B, an intact ORF4 was present in clinical isolates.
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Overlapping repressor binding sites result in additive regulation of Escherichia coli FadH by FadR and ArcA. J Bacteriol 2010; 192:4289-99. [PMID: 20622065 DOI: 10.1128/jb.00516-10] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Escherichia coli fadH encodes a 2,4-dienoyl reductase that plays an auxiliary role in beta-oxidation of certain unsaturated fatty acids. In the 2 decades since its discovery, FadH biochemistry has been studied extensively. However, the genetic regulation of FadH has been explored only partially. Here we report mapping of the fadH promoter and document its complex regulation by three independent regulators, the fatty acid degradation FadR repressor, the oxygen-responsive ArcA-ArcB two-component system, and the cyclic AMP receptor protein-cyclic AMP (CRP-cAMP) complex. Electrophoretic mobility shift assays demonstrated that FadR binds to the fadH promoter region and that this binding can be specifically reversed by long-chain acyl-coenzyme A (CoA) thioesters. In vivo data combining transcriptional lacZ fusion and real-time quantitative PCR (qPCR) analyses indicated that fadH is strongly repressed by FadR, in agreement with induction of fadH by long-chain fatty acids. Inactivation of arcA increased fadH transcription by >3-fold under anaerobic conditions. Moreover, fadH expression was increased 8- to 10-fold under anaerobic conditions upon deletion of both the fadR and the arcA gene, indicating that anaerobic expression is additively repressed by FadR and ArcA-ArcB. Unlike fadM, a newly reported member of the E. coli fad regulon that encodes another auxiliary beta-oxidation enzyme, fadH was activated by the CRP-cAMP complex in a manner similar to those of the prototypical fad genes. In the absence of the CRP-cAMP complex, repression of fadH expression by both FadR and ArcA-ArcB was very weak, suggesting a possible interplay with other DNA binding proteins.
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Abstract
HCoV-NL63 and HCoV-229E are two of the four human coronaviruses that circulate worldwide. These two viruses are unique in their relationship towards each other. Phylogenetically, the viruses are more closely related to each other than to any other human coronavirus, yet they only share 65% sequence identity. Moreover, the viruses use different receptors to enter their target cell. HCoV-NL63 is associated with croup in children, whereas all signs suggest that the virus probably causes the common cold in healthy adults. HCoV-229E is a proven common cold virus in healthy adults, so it is probable that both viruses induce comparable symptoms in adults, even though their mode of infection differs. Here, we present an overview of the current knowledge on both human coronaviruses, focusing on similarities and differences.
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Affiliation(s)
- Ronald Dijkman
- Laboratory of Experimental Virology, Department of Medical Microbiology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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Feng Y, Zheng F, Pan X, Sun W, Wang C, Dong Y, Ju AP, Ge J, Liu D, Liu C, Yan J, Tang J, Gao GF. Existence and characterization of allelic variants of Sao, a newly identified surface protein from Streptococcus suis. FEMS Microbiol Lett 2007; 275:80-8. [PMID: 17854470 PMCID: PMC7110054 DOI: 10.1111/j.1574-6968.2007.00859.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Surface antigen one (Sao) is a newly identified protein from the major zoonotic pathogen, Streptococcus suis. In search of functional proteins related to the pathogenesis of Chinese S. suis 2 (SS2), unexpectedly, a variant of Sao protein was obtained. To test its prevalence in S. suis, PCR assay was adopted to address the coding genes systematically. It was found that there are three allelic variants of sao gene, namely sao-S, sao-M, and sao-L based on the different lengths of the genes (approximately 1.5, approximately 1.7, and approximately 2.0 kb, respectively). These differences were determined to be caused by heterogeneity within the number of C-terminal repeat sequences (R), which had been seen as a pathogenicity-related domain in the plant pathogen, Xanthomonas oryzae. Two variants (sao-M and sao-L) were only found in SS2. All three variant proteins were prepared in vitro and their biochemical and biophysical properties were characterized. A soluble form of Sao-M protein was then used as a capture antigen to develop an enzyme-linked immunosorbent assay method to detect antibodies against SS2 in convalescent pig sera. Taken together, the results exhibit the properties of Sao proteins and provide an efficient Sao-M-based method for monitoring SS2 infection.
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Affiliation(s)
- Youjun Feng
- Center for Molecular Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- Graduate University, Chinese Academy of Sciences, Beijing, China
| | - Feng Zheng
- Department of Epidemiology, Research Institute for Medicine of Nanjing Command, Nanjing, China
| | - Xiuzhen Pan
- Department of Epidemiology, Research Institute for Medicine of Nanjing Command, Nanjing, China
| | - Wen Sun
- Department of Epidemiology, Research Institute for Medicine of Nanjing Command, Nanjing, China
| | - Changjun Wang
- Department of Epidemiology, Research Institute for Medicine of Nanjing Command, Nanjing, China
| | - Yaqing Dong
- Department of Epidemiology, Research Institute for Medicine of Nanjing Command, Nanjing, China
| | - Ai-ping Ju
- Department of Epidemiology, Research Institute for Medicine of Nanjing Command, Nanjing, China
| | - Junchao Ge
- Department of Epidemiology, Research Institute for Medicine of Nanjing Command, Nanjing, China
| | - Di Liu
- Center for Molecular Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Cuihua Liu
- Center for Molecular Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Jinghua Yan
- Center for Molecular Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Jiaqi Tang
- Department of Epidemiology, Research Institute for Medicine of Nanjing Command, Nanjing, China
| | - George F. Gao
- Center for Molecular Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- Correspondence: George F. Gao, Center for Molecular Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China. Tel.: +86 10 62552530; fax: +86 10 62521882; e-mail:
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