Preparation of virus-like particle mimetic nanovesicles displaying the S protein of Middle East respiratory syndrome coronavirus using insect cells

In this study, structural proteins of MERS-CoV were expressed in silkworm larvae and Bm5 cells for the development of vaccine candidates against MERS-CoV and diagnostic methods. The spike (S) protein of MERS-CoV lacking its transmembrane and cytoplasmic domains (SοTM) was secreted into the hemolymph of silkworm larvae using a bombyxin signal peptide and purified using affinity chromatography. The purified SοTM forms small nanoparticles as well as the full-length S protein and has the ability to bind human dipeptidyl peptidase 4 (DPP4), which is a receptor of MERS-CoV. These results indicate that bioactive SοTM was expressed in silkworm larvae. To produce MERS-CoV-like particles (MERS-CoV-LPs), the coexpression of spike proteins was performed in Bm5 cells and envelope (E) and membrane (M) proteins secreted E and M proteins extracellularly, suggesting that MERS-CoV-LPs may be formed. However, this S protein was not displayed on virus-like particles (VLPs) even though E and M proteins were secreted into the culture supernatant. By surfactant treatment and mechanical extrusion using S protein- or three structural protein-expressing Bm5 cells, S protein-displaying nanovesicles with diameters of approximately 100⿿nm⿿⿿⿿200⿿nm were prepared and confirmed by immuno-TEM. The mechanical extrusion method is favorable for obtaining uniform recombinant protein-displaying nanovesicles from cultured cells. The purified SοTM from silkworm larvae and S...
Source: Journal of Biotechnology - Category: Biotechnology Source Type: research

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Condition:   Middle East Respiratory Syndrome Coronavirus Intervention:   Biological: ChAdOx1 MERS Sponsors:   King Abdullah International Medical Research Center;   University of Oxford Not yet recruiting
Source: ClinicalTrials.gov - Category: Research Source Type: clinical trials
Middle East Respiratory Syndrome Coronavirus (MERS-COV) is the main cause of lung and kidney infections in developing countries such as Saudi Arabia and South Korea. This infectious single-stranded, positive (...
Source: Journal of Translational Medicine - Category: Research Authors: Tags: Research Source Type: research
Severe Acute Respiratory Syndrome (SARS) and Middle East Respiratory Syndrome (MERS) are two coronaviruses with demonstrated potential to generate significant nosocomial outbreaks. In particular, MERS continue...
Source: Theoretical Biology and Medical Modelling - Category: Biomedical Science Authors: Tags: Research Source Type: research
Publication date: 24 September 2019Source: Cell Reports, Volume 28, Issue 13Author(s): Nianshuang Wang, Osnat Rosen, Lingshu Wang, Hannah L. Turner, Laura J. Stevens, Kizzmekia S. Corbett, Charles A. Bowman, Jesper Pallesen, Wei Shi, Yi Zhang, Kwanyee Leung, Robert N. Kirchdoerfer, Michelle M. Becker, Mark R. Denison, James D. Chappell, Andrew B. Ward, Barney S. Graham, Jason S. McLellanSummaryMiddle East respiratory syndrome coronavirus (MERS-CoV) emerged into the human population in 2012 and has caused substantial morbidity and mortality. Potently neutralizing antibodies targeting the receptor-binding domain (RBD) on MER...
Source: Cell Reports - Category: Cytology Source Type: research
Publication date: 2019Source: Advances in Virus Research, Volume 105Author(s): M. Alejandra Tortorici, David VeeslerAbstractCoronaviruses (CoVs) have caused outbreaks of deadly pneumonia in humans since the beginning of the 21st century. The severe acute respiratory syndrome coronavirus (SARS-CoV) emerged in 2002 and was responsible for an epidemic that spread to five continents with a fatality rate of 10% before being contained in 2003 (with additional cases reported in 2004). The Middle-East respiratory syndrome coronavirus (MERS-CoV) emerged in the Arabian Peninsula in 2012 and has caused recurrent outbreaks in humans w...
Source: Advances in Virus Research - Category: Virology Source Type: research
Coronaviruses are enveloped, single-stranded RNA viruses that are distributed worldwide. They include transmissible gastroenteritis virus (TGEV), porcine epidemic diarrhea virus (PEDV), and the human coronaviruses severe acute respiratory syndrome coronavirus (SARS-CoV) and Middle East respiratory syndrome coronavirus (MERS-CoV), many of which seriously endanger human health and well-being. Only alphacoronaviruses and betacoronaviruses harbor nonstructural protein 1 (nsp1), which performs multiple functions in inhibiting antiviral host responses. The role of the C terminus of betacoronavirus nsp1 in virulence has been char...
Source: Journal of Biological Chemistry - Category: Chemistry Authors: Tags: Microbiology Source Type: research
by Dan Lu, Kefang Liu, Di Zhang, Can Yue, Qiong Lu, Hao Cheng, Liang Wang, Yan Chai, Jianxun Qi, Lin-Fa Wang, George F. Gao, William J. Liu Bats harbor many zoonotic viruses, including highly pathogenic viruses of humans and other mammals, but they are typically asymptomatic in bats. To further understand the antiviral immunity of bats, we screened and identified a series of bat major histocompatibility complex (MHC) I Ptal-N*01:01– binding peptides derived from four different bat-borne viruses, i.e., Hendra virus (HeV), Ebola virus (EBOV), Middle East respiratory syndrome coronavirus (MERS-CoV), and H17N10 influenz...
Source: PLoS Biology: Archived Table of Contents - Category: Biology Authors: Source Type: research
In this study, a bacterium (Lactococcus lactis)-like particle (BLP) vaccine displaying the MERS-CoV receptor-binding domain (RBD) was developed, and gram-positive enhancer matrix (GEM) particles were used as substrates to externally bind to the MERS-CoV RBD through a protein anchor (PA). The designs included different numbers of lysin motif (LysM) repeats in the PAs linked by linkers (RBD-linker-PA2 (RLP2), RBD-linker-PA3 (RLP3) and RBD-PA3 (RP3)), and three LysM repeats and a linker in the fusion proteins increased the binding activity to the RBD. The specific immune responses were tested by intranasally immunizing mice w...
Source: Viruses - Category: Virology Authors: Tags: Article Source Type: research
Publication date: Available online 22 August 2019Source: Advances in Virus ResearchAuthor(s): M. Alejandra Tortorici, David VeeslerAbstractCoronaviruses (CoVs) have caused outbreaks of deadly pneumonia in humans since the beginning of the 21st century. The severe acute respiratory syndrome coronavirus (SARS-CoV) emerged in 2002 and was responsible for an epidemic that spread to five continents with a fatality rate of 10% before being contained in 2003 (with additional cases reported in 2004). The Middle-East respiratory syndrome coronavirus (MERS-CoV) emerged in the Arabian Peninsula in 2012 and has caused recurrent outbre...
Source: Advances in Virus Research - Category: Virology Source Type: research
Middle East respiratory syndrome (MERS) is a deadly viral respiratory disease caused by MERS-coronavirus (MERS-CoV) infection. To date, there is no specific treatment proven effective against this viral disease. In addition, no vaccine has been licensed to prevent MERS-CoV thus far. Therefore, our current review focuses on the most recent studies in search of an effective MERS vaccine. Overall, vaccine candidates against MERS-CoV are mainly based upon the viral spike (S) protein, due to its vital role in the viral infectivity, although several studies focused on other viral proteins such as the nucleocapsid (N) protein, en...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
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