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https://www.readbyqxmd.com/read/29143881/rmce-based-insect-cell-platform-to-produce-membrane-proteins-captured-on-hiv-1-gag-virus-like-particles
#1
João Vidigal, Bárbara Fernandes, Mafalda M Dias, Marco Patrone, António Roldão, Manuel J T Carrondo, Paula M Alves, Ana P Teixeira
Conformationally complex membrane proteins (MPs) are therapeutic targets in many diseases, but drug discovery has been slowed down by the lack of efficient production tools. Co-expression of MPs with matrix proteins from enveloped viruses is a promising approach to obtain correctly folded proteins at the surface of virus-like particles (VLPs), preserving their native lipidic environment. Here, we implemented a site-specific recombinase-mediated cassette exchange (RMCE) strategy to establish a reusable HIV-1 Gag-expressing insect cell line for fast production of target MPs on the surface of Gag-VLPs...
November 16, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29140444/safety-and-immunogenicity-of-different-formulations-of-norovirus-vaccine-candidate-in-healthy-adults-a-randomized-controlled-double-blind-clinical-trial
#2
G Leroux-Roels, J P Cramer, P M Mendelman, J Sherwood, R Clemens, A Aerssens, I De Coster, A Borkowski, F Baehner, P Van Damme
Background: We investigated safety and immunogenicity of 1-2 doses of different bivalent virus-like particle (VLP) norovirus vaccine candidate (NoV) formulations in healthy 18-64-year-olds. Methods: On Days 1 and 28 participants (n=420) randomized to 14 equal groups received intramuscular control vaccine (hepatitis A) or one of 11 NoV formulations contained varying dosages of GI.1 and GII.4c genotype VLP antigens with Al(OH)3, and 0μg, 15μg or 50μg MPL. Immunogenicity was assessed on Days 1, 28, 56, 208 and 393...
November 13, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29131580/modular-self-assembly-of-protein-cage-lattices-for-multistep-catalysis
#3
Masaki Uchida, Kimberly McCoy, Masafumi Fukuto, Lin Yang, Hideyuki Yoshimura, Heini M Miettinen, Ben LaFrance, Dustin P Patterson, Benjamin Schwarz, Jonathan A Karty, Peter E Prevelige, Byeongdu Lee, Trevor Douglas
The assembly of individual molecules into hierarchical structures is a promising strategy for developing three-dimensional materials with properties arising from interaction between the individual building blocks. Virus capsids are elegant examples of biomolecular nanostructures, which are themselves hierarchically assembled from a limited number of protein subunits. Here we demonstrate the bio-inspired modular construction of materials with two levels of hierarchy; the formation of catalytically active individual virus-like particles (VLPs) through directed self-assembly of capsid subunits with enzyme encapsulation, and the assembly of these VLP building blocks into three-dimensional arrays...
November 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/29129705/a-virus-like-particle-of-the-hepatitis-b-virus-pres-antigen-elicits-robust-neutralizing-antibodies-and-t-cell-responses-in-mice
#4
Xiaodan Cai, Weihao Zheng, Shaokun Pan, Shengyuan Zhang, Youhua Xie, Haitao Guo, Guoxin Wang, Zigang Li, Ming Luo
The preS antigen of hepatitis B virus (HBV) corresponds to the N-terminal polypeptide in the large (L) antigen in addition to the small (S) antigen. The virus-like particle (VLP) of the S antigen is widely used as a vaccine to protect the population from HBV infection. The presence of the S antigen and its antibodies in patient blood has been used as markers to monitor hepatitis B. However, there is very limited knowledge about the preS antigen. We generated a preS VLP that is formed by a chimeric protein between preS and hemagglutinin (HA), and the matrix protein M1 of influenza virus...
November 10, 2017: Antiviral Research
https://www.readbyqxmd.com/read/29129453/hepatitis-b-virus-core-particles-containing-multiple-epitopes-confer-protection-against-enterovirus-71-and-coxsackievirus-a16-infection-in-mice
#5
Chunling Huo, Jie Yang, Lei Lei, Lei Qiao, Jiantao Xin, Zishu Pan
Human enterovirus 71 (EV71) and coxsackievirus A16 (CA16) are the two major causative agents of hand-foot-and-mouth disease (HFMD). To investigate novel combined vaccines to prevent EV71 and CA16 infection, we constructed chimeric virus-like particles (tHBc/SPA or tHBc/SP VLPs) displaying conserved epitopes of EV71 (aa 208-222 of VP1 and aa 248-263 of VP2) and CA16 (aa271-285 of VP1) using a truncated hepatitis B virus core carrier (tHBc). Immunization with the chimeric VLPs induced epitope- or virus-specific IgG and neutralization antibodies against EV71 and CA16 in the mice...
November 9, 2017: Vaccine
https://www.readbyqxmd.com/read/29125554/antibody-competition-reveals-surface-location-of-hpv-l2-minor-capsid-protein-residues-17-36
#6
Stephanie M Bywaters, Sarah A Brendle, Kerstin P Tossi, Jennifer Biryukov, Craig Meyers, Neil D Christensen
The currently available nonavalent human papillomavirus (HPV) vaccine exploits the highly antigenic L1 major capsid protein to promote high-titer neutralizing antibodies, but is limited to the HPV types included in the vaccine since the responses are highly type-specific. The limited cross-protection offered by the L1 virus-like particle (VLP) vaccine warrants further investigation into cross-protective L2 epitopes. The L2 proteins are yet to be fully characterized as to their precise placement in the virion...
November 10, 2017: Viruses
https://www.readbyqxmd.com/read/29114389/adoptive-cell-therapy-with-cd4-t-helper-1-cells-and-cd8-cytotoxic-t-cells-enhances-complete-rejection-of-an-established-tumour-leading-to-generation-of-endogenous-memory-responses-to-non-targeted-tumour-epitopes
#7
Kunyu Li, Braeden Donaldson, Vivienne Young, Vernon Ward, Christopher Jackson, Margaret Baird, Sarah Young
The results of adoptive T-cell therapies (ACTs) are very encouraging and show clinical evidence that ACT can provide a cure for patients with metastatic disease. However, various response rates and long-term cancer remission have been observed in different ACT trials. The types of T cells, prior treatment with chemotherapy and co-administration of other immune-target therapies have been found to influence the efficacy of ACT. In this study, we investigate the ability of ACT using CD4(+) T helper 1 (Th1) cells and CD8(+) cytotoxic T lymphocytes (CTLs) to reject the growth of established B16-ovalbumin (OVA) melanoma...
October 2017: Clinical & Translational Immunology
https://www.readbyqxmd.com/read/29103166/transient-gene-expression-optimization-and-expression-vector-comparison-to-improve-hiv-1-vlp-production-in-hek293-cell-lines
#8
Javier Fuenmayor, Laura Cervera, Sonia Gutiérrez-Granados, Francesc Gòdia
Transient gene expression (TGE) has been used at small and medium scale for the production of biologicals in sufficient quantities to perform pre-clinical and characterization studies. Polyethyleneimine (PEI)-mediated transfection offers a low toxicity and non-expensive method for cell transfection. DNA and PEI concentration for transient gene expression has been extensively optimized in order to increase product titers. However, the possibility to extrapolate the optimal concentrations found for a specific bioprocess when expression vectors or cell lines need to be changed has not been investigated...
November 4, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29094307/plant-based-chimeric-hpv-virus-like-particles-bearing-amyloid-%C3%AE-epitopes-elicit-antibodies-able-to-recognize-amyloid-plaques-in-app-tg-mouse-and-alzheimer-s-disease-brains
#9
R Gonzalez-Castro, G Acero Galindo, Y García Salcedo, L Uribe Campero, V Vazquez Perez, M Carrillo-Tripp, G Gevorkian, M A Gomez Lim
The main amyloid-beta (Aβ) variants detected in the human brain are full-length Aβ1-40 and Aβ1-42 peptides; however, a significant proportion of AD brain Aβ consists also of N-terminal truncated/modified species. The majority of the previous immunotherapeutic strategies targeted the N-terminal immunodominant epitope of the full-length Aβ; however, most of the pathological N-truncated forms of Aβ lack this critical B cell epitope. Recently, virus-like particles (VLPs), self-assembled structures with highly ordered repetitive patterns on their surface and capable of inducing robust immune responses, were applied as a promising platform for various antigen expressions...
November 1, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/29093091/a-3-0-angstrom-resolution-cryo-electron-microscopy-structure-and-antigenic-sites-of-coxsackievirus-a6-like-particles
#10
Jinhuan Chen, Chao Zhang, Yu Zhou, Xiang Zhang, Chaoyun Shen, Xiaohua Ye, Wen Jiang, Zhong Huang, Yao Cong
Coxsackievirus A6 (CVA6) has recently emerged as one of the predominant causative agents of hand, foot, and mouth disease (HFMD). Structure of CVA6 mature viral particle has not been solved thus far. Our previous work shows that recombinant virus-like particles (VLPs) of CVA6 represent a promising CVA6 vaccine candidate. Here, we report the first cryo-electron microscopy (cryo-EM) structure of CVA6 VLP at 3.0 Å resolution. CVA6 VLP exhibits the characteristic features of enteroviruses, but presents an open channel at the two-fold axis and an empty, collapsed VP1 pocket, which is broadly similar to the structures of enterovirus 71 (EV71) VLP and coxsackievirus A16 (CVA16) 135S expanded particle, indicating that CVA6 VLP is in an expanded conformation...
November 1, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29083994/assembly-disassembly-of-a-complex-icosahedral-virus-to-incorporate-heterologous-nucleic-acids
#11
Elena Pascual, Carlos P Mata, José L Carrascosa, Jose R Caston
Hollow protein containers are widespread in nature, and include virus capsids as well as eukaryotic and bacterial complexes. Protein cages are studied extensively for applications in nanotechnology, nanomedicine and materials science. Their inner and outer surfaces can be modified chemically or genetically, and the internal cavity can be used to template, store and/or arrange molecular cargos. Virus capsids and virus-like particles (VLP, noninfectious particles) provide versatile platforms for nanoscale bioengineering...
October 30, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29080666/topically-applied-virus-like-particles-containing-hiv-1-pr55-gag-protein-reach-skin-antigen-presenting-cells-after-mild-skin-barrier-disruption
#12
Fiorenza Rancan, Zahra Afraz, Sabrina Hadam, Lina Weiß, Hélène Perrin, Alexander Kliche, Petra Schrade, Sebastian Bachmann, Monika Schäfer-Korting, Ulrike Blume-Peytavi, Ralf Wagner, Béhazine Combadière, Annika Vogt
Loading of antigen on particles as well as the choice of skin as target organ for vaccination were independently described as effective dose-sparing strategies for vaccination. Combining these two strategies, sufficient antigen recognition may be achievable via the transcutaneous route even with minimal-invasive tools. Here, we investigated the skin penetration and cellular uptake of topically administered virus-like particles (VLPs), composed of the HIV-1 precursor protein Pr55(gag), as well as the migratory activity of skin antigen-presenting cells (APCs)...
November 2, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29074234/development-of-a-rapid-and-quantitative-method-for-the-analysis-of-viral-entry-and-release-using-a-nanoluc-luciferase-complementation-assay
#13
Michihito Sasaki, Paulina D Anindita, Wallaya Phongphaew, Michael Carr, Shintaro Kobayashi, Yasuko Orba, Hirofumi Sawa
Subviral particles (SVPs) self-assemble and are released from cells transfected with expression plasmids encoding flavivirus structural proteins. Flavivirus-like particles (VLPs), consisting of flavivirus structural proteins and a subgenomic replicon, can enter cells and cause single-round infections. Neither SVPs or VLPs possess complete viral RNA genomes, therefore are replication-incompetent systems; however, they retain the capacity to fuse and bud from target cells and follow the same maturation process as whole virions...
October 23, 2017: Virus Research
https://www.readbyqxmd.com/read/29070691/structure-immunogenicity-and-protective-mechanism-of-an-engineered-enterovirus-71-like-particle-vaccine-mimicking-80s-empty-capsid
#14
Xiaoli Wang, Zhiqiang Ku, Xiang Zhang, Xiaohua Ye, Jinhuan Chen, Qingwei Liu, Wei Zhang, Chao Zhang, Zhenglin Fu, Xia Jin, Yao Cong, Zhong Huang
Enterovirus 71 (EV71) is the major causative agent of severe hand, foot and mouth disease which affects millions of young children in the Asia-Pacific region annually. In this study, we engineered a novel EV71 virus-like particle (VLP) that lacks VP4 (thereby designated "VLPΔVP4"), and investigated its structure, antigenicity and vaccine potential. The cryo-EM structure of VLPΔVP4 was reconstructed to 3.71 Å resolution. Results from structural and biochemical analyses reveal that VLPΔVP4 resembles the end product of the viral uncoating process, the 80S empty capsid...
October 25, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29067022/soil-viral-communities-vary-temporally-and-along-a-land-use-transect-as-revealed-by-virus-like-particle-counting-and-a-modified-community-fingerprinting-approach-frapd
#15
Anja Narr, Ali Nawaz, Lukas Y Wick, Hauke Harms, Antonis Chatzinotas
Environmental surveys on soil viruses are still rare and mostly anecdotal, i. e., they mostly report on viruses at one location or for only a few sampling dates. Detailed time-series analysis with multiple samples can reveal the spatio-temporal dynamics of viral communities and provide important input as to how viruses interact with their potential hosts and the environment. Such surveys, however, require fast, easy-to-apply and reliable methods. In the present study we surveyed monthly across 13 months the abundance of virus-like particles (VLP) and the structure of the viral communities in soils along a land use transect (i...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29046400/ribosome-biogenesis-modulates-ty1-copy-number-control-in-saccharomyces-cerevisiae
#16
Hyo Won Ahn, Jessica M Tucker, Joshua A Arribere, David J Garfinkel
Transposons can impact the host genome by altering gene expression and participating in chromosome rearrangements. Therefore, organisms evolved different ways to minimize the level of transposition. In Saccharomyces cerevisiae and its close relative S. paradoxus, Ty1 copy number control (CNC) is mediated by the self-encoded restriction factor p22, which is derived from the GAG capsid gene and inhibits virus-like particle (VLP) assembly and function. Based on secondary screens of Ty1 cofactors, we identified LOC1, a RNA localization/ribosome biogenesis gene that affects Ty1 mobility predominantly in strains harboring Ty1 elements...
October 18, 2017: Genetics
https://www.readbyqxmd.com/read/29046160/construction-and-production-of-hiv-vlp-harboring-mper-v3-for-potential-vaccine-study
#17
Tohidi Fatemeh, Sadat Seyed Mehdi, Bolhassani Azam, Yaghobi Ramin
Vaccine against HIV-1 is not currently available. In present, Virus like particles (VLPs) as effective strategy was used in several vaccine developing. Two conserved sequences; V3 loop of gp120 and the membrane-proximal external region (MPER) of gp41 are dominant sites for vaccine studies. In this study, we used fusion gene of MPER and V3 to product recombinant VLPs and introduced a novel retroviral VLPs harboring high copy of MPER-V3 for HIV-1 vaccine design. The pEGFP-N1 plasmid harboring MPER-V3 sequence with Vpr linker was constructed...
October 17, 2017: Current HIV Research
https://www.readbyqxmd.com/read/29031822/a-systematic-review-of-volar-locking-plate-removal-after-distal-radius-fracture
#18
REVIEW
Michiro Yamamoto, Yuki Fujihara, Nasa Fujihara, Hitoshi Hirata
BACKGROUND: Indication of volar locking plate (VLP) removal after bony healing of distal radius fracture (DRF) is controversial. Studies with various range of removal rate were reported. The purpose of this systematic review was to investigate the frequency and the reasons of hardware removal over the world. We hypothesized that more frequent VLP removal contribute to better clinical outcomes. METHODS: The authors searched all available literature in the PubMed and EMBASE databases for articles reporting on outcomes of treatment using VLP for DRF...
October 9, 2017: Injury
https://www.readbyqxmd.com/read/29031660/lichen-planus-affecting-the-female-genitalia-a-retrospective-review-of-patients-at-mayo-clinic
#19
Caoimhe M R Fahy, Rochelle R Torgerson, Mark D P Davis
BACKGROUND: Genital or vulval lichen planus (VLP) may have a disabling effect on a patient's quality of life. Evidence-based management guidelines are lacking for VLP. OBJECTIVE: We sought to review clinical presentation and treatment of patients who received a diagnosis of VLP. METHODS: The 100 consecutive patients who received a diagnosis of VLP at Mayo Clinic between January 1, 1997, and December 31, 2015, were reviewed retrospectively...
October 11, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/29021793/intracellular-crosslinking-of-filoviral-nucleoproteins-with-xintrabodies-restricts-viral-packaging
#20
Tamarand Lee Darling, Laura Jo Sherwood, Andrew Hayhurst
Viruses assemble large macromolecular repeat structures that become part of the infectious particles or virions. Ribonucleocapsids (RNCs) of negative strand RNA viruses are a prime example where repetition of nucleoprotein (NP) along the genome creates a core polymeric helical scaffold that accommodates other nucleocapsid proteins including viral polymerase. The RNCs are transported through the cytosol for packaging into virions through association with viral matrix proteins at cell membranes. We hypothesized that RNC would be ideal targets for crosslinkers engineered to promote aberrant protein-protein interactions, thereby blocking their orderly transport and packaging...
2017: Frontiers in Immunology
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