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Polyhedrin promoter

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https://www.readbyqxmd.com/read/28823035/armored-dna-in-recombinant-baculoviruses-as-controls-in-molecular-genetic-assays
#1
Andrea Freystetter, Christian Paar, Herbert Stekel, Jörg Berg
The widespread use of molecular PCR-based assays in analytical and clinical laboratories brings about the need for test-specific, stable, and reliable external controls (EC) as well as standards and internal amplification controls (IC), in order to arrive at consistent test results. In addition, there is also a growing need to produce and provide stable, well-characterized molecular controls for quality assurance programs. In this study, we describe a novel approach to generate armored double-stranded DNA controls, which are encapsulated in baculovirus (BV) particles of the species Autographa californica multiple nucleopolyhedrovirus...
August 19, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28794924/expression-of-tomato-yellow-leaf-curl-virus-coat-protein-using-baculovirus-expression-system-and-evaluation-of-its-utility-as-a-viral-antigen
#2
Lamiaa Elgaied, Reda Salem, Wael Elmenofy
DNA encoding the coat protein (CP) of an Egyptian isolate of tomato yellow leaf curl virus (TYLCV) was inserted into the genome of Autographa californica nucleopolyhedrovirus (AcNPV) under the control of polyhedrin promoter. The generated recombinant baculovirus construct harboring the coat protein gene was characterized using PCR analysis. The recombinant coat protein expressed in infected insect cells was used as a coating antigen in an indirect Enzyme-linked immunosorbent assay (ELISA) and dot blot to test its utility for the detection of antibody generated against TYLCV virus particles...
August 2017: 3 Biotech
https://www.readbyqxmd.com/read/28668116/macrobac-new-technologies-for-robust-and-efficient-large-scale-production-of-recombinant-multiprotein-complexes
#3
Scott D Gradia, Justin P Ishida, Miaw-Sheue Tsai, Chris Jeans, John A Tainer, Jill O Fuss
Recombinant expression of large, multiprotein complexes is essential and often rate limiting for determining structural, biophysical, and biochemical properties of DNA repair, replication, transcription, and other key cellular processes. Baculovirus-infected insect cell expression systems are especially well suited for producing large, human proteins recombinantly, and multigene baculovirus systems have facilitated studies of multiprotein complexes. In this chapter, we describe a multigene baculovirus system called MacroBac that uses a Biobricks-type assembly method based on restriction and ligation (Series 11) or ligation-independent cloning (Series 438)...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28645582/improved-pfastbac%C3%A2-donor-plasmid-vectors-for-higher-protein-production-using-the-bac-to-bac%C3%A2-baculovirus-expression-vector-system
#4
Hui Shang, Tyler A Garretson, C M Senthil Kumar, Robert F Dieter, Xiao-Wen Cheng
The Autographa californica multiple nucleopolyhedrovirus (AcMNPV)-based Bac-to-Bac(®) expression system consists of a bacmid and five pFastBac™ donor transfer vectors. It has been widely used for eukaryotic gene expression in insect cells to elucidate gene function in biotechnology laboratories. The pFastBac™ vectors contain a 50bp AcMNPV polyhedrin (polh) promoter and a 127bp SV40 polyadenylation (pA) signal for cloning a gene of interest into the bacmid, resulting in unsolved lower gene expression levels than the wild type (wt) AcMNPV in insect cells...
June 20, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28500037/improving-baculovirus-infectivity-by-efficiently-embedding-enhancing-factors-into-occlusion-bodies
#5
Shili Yang, Lijuan Zhao, Ruipeng Ma, Wei Fang, Jia Hu, Chengfeng Lei, Xiulian Sun
The relatively low infectivity of baculoviruses to their host larvae limits their use as insecticidal agents on a larger scale. In the present study, a novel strategy was developed to efficiently embed foreign proteins into Autographa californica multiple nucleopolyhedrovirus (AcMNPV) occlusion bodies (OBs) to achieve stable expression of foreign proteins and to improve viral infectivity. A recombinant AcMNPV bacmid was constructed by expressing the 150-amino-acid (aa) N-terminal segment of polyhedrin under the control of the p10 promoter and the remaining C-terminal 95-aa segment under the control of the polyhedrin promoter...
July 15, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28469195/n-glycan-modification-of-a-recombinant-protein-via-coexpression-of-human-glycosyltransferases-in-silkworm-pupae
#6
Tatsuya Kato, Natsumi Kako, Kotaro Kikuta, Takatsugu Miyazaki, Sachiko Kondo, Hirokazu Yagi, Koichi Kato, Enoch Y Park
Recombinant proteins produced in insect cells and insects, unlike those produced in mammalian cells, have pauci-mannose-type N-glycans. In this study, we examined complex-type N-glycans on recombinant proteins via coexpression of human β-1,2-N-acetylglucosaminyltransferase II (hGnT II) and human β1,4-galactosyltransferase (hGalT I) in silkworm pupae, by using the Bombyx mori nucleopolyhedrovirus (BmNPV) bacmid system. The actin A3 promoter from B. mori and the polyhedrin promoter from Autographa californica multiple nucleopolyhedroviruses (AcMNPVs) were used to coexpress hGnT II and hGalT I...
May 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/27375973/a-novel-baculovirus-derived-promoter-with-high-activity-in-the-baculovirus-expression-system
#7
María Martínez-Solís, Silvia Gómez-Sebastián, José M Escribano, Agata K Jakubowska, Salvador Herrero
The baculovirus expression vector system (BEVS) has been widely used to produce a large number of recombinant proteins, and is becoming one of the most powerful, robust, and cost-effective systems for the production of eukaryotic proteins. Nevertheless, as in any other protein expression system, it is important to improve the production capabilities of this vector. The orf46 viral gene was identified among the most highly abundant sequences in the transcriptome of Spodoptera exigua larvae infected with its native baculovirus, the S...
2016: PeerJ
https://www.readbyqxmd.com/read/27177910/the-pacific-white-shrimp-%C3%AE-actin-promoter-functional-properties-and-the-potential-application-for-transduction-system-using-recombinant-baculovirus
#8
Yingli Shi, Jianhai Xiang, Guangzhou Zhou, Tetsuzan Benny Ron, Hsin-I Tong, Wen Kang, Si Sun, Yuanan Lu
A newly isolated Pacific white shrimp (Litopenaeus vannamei) beta-actin promoter SbaP and its derivative compact construct SbaP (ENX) have recently been demonstrated to promote ectopic gene expression in vitro and in vivo. To further explore the potential transduction application, this newly isolated shrimp promoter SbaP was comparatively tested with cytomegalovirus (CMV), simian virus 40 (SV40), polyhedrin (Polh), and white spot syndrome virus immediate early gene 1 (WSSV ie1) four constitutive promoters and a beta-actin promoter (TbaP) from tilapia fish to characterize its promoting function in eight different cell lines...
June 2016: Marine Biotechnology
https://www.readbyqxmd.com/read/27085857/baculovirus-mediated-gcrv-vp7-and-vp6-genes-expression-in-silkworm-and-grass-carp
#9
Bo Liu, Yongchang Gong, Zhen Li, Xiaolong Hu, Guangli Cao, Renyu Xue, Chengliang Gong
Grass carp hemorrhagic disease is a common fish disease and often results in significant economic losses in grass carp aquaculture in China. This study was aimed to develop a novel oral vaccine against grass carp reovirus (GCRV). GCRV vp6 and vp7 genes with β-actin promoter of Megalobrama amblycephala and polyhedrin promoter (Ph10) of baculovirus, respectively, were cloned into plasmid pFast™-Dual to construct a vector pFast-PHVP7-AVP6, which was used to generate a recombinant baculovirus BacFish-vp6/vp7 via Bac-to-Bac system...
June 2016: Molecular Biology Reports
https://www.readbyqxmd.com/read/27030553/n-terminally-elongated-spliinx2-and-spliinx3-reduce-baculovirus-triggered-apoptosis-via-hemichannel-closure
#10
Ya-Bin Chen, Wei Xiao, Ming Li, Yan Zhang, Yang Yang, Jian-Sheng Hu, Kai-Jun Luo
The hemichannel and gap junction channel are major portals for the release of factors responsible for the effects of apoptotic cells on the spread of apoptosis to neighboring cells and apoptotic corpse clearance, typically by phagocytes. The N-terminal cytoplasmic domain in the connexins, gap junction proteins in vertebrate, has been implicated in regulating channel closure. However, little is known about how the hemichannel close responds to apoptotic signaling transduction leading to the reduction of neighboring cellular apoptosis in an invertebrate...
May 2016: Archives of Insect Biochemistry and Physiology
https://www.readbyqxmd.com/read/26820854/recombinant-baculovirus-isolation
#11
Linda A King, Richard Hitchman, Robert D Possee
Although there are several different methods available of making recombinant baculovirus expression vectors (reviewed in Chapter 3 ), all require a stage in which insect cells are transfected with either the virus genome alone (Bac-to-Bac(®) or BaculoDirect™, Invitrogen) or virus genome and transfer vector. In the latter case, this allows the natural process of homologous recombination to transfer the foreign gene, under control of the polyhedrin or other baculovirus gene promoter, from the transfer vector to the virus genome to create the recombinant virus...
2016: Methods in Molecular Biology
https://www.readbyqxmd.com/read/26820852/introduction-to-baculovirus-molecular-biology
#12
REVIEW
Barbara J Kelly, Linda A King, Robert D Possee
The development of baculovirus expression vector systems has accompanied a rapid expansion of our knowledge about the genes, their function and regulation in insect cells. Classification of these viruses has also been refined as we learn more about differences in gene content between isolates, how this affects virus structure and their replication in insect larvae. Baculovirus gene expression occurs in an ordered cascade, regulated by early, late and very late gene promoters. There is now a detailed knowledge of these promoter elements and how they interact first with host cell-encoded RNA polymerases and later with virus-encoded enzymes...
2016: Methods in Molecular Biology
https://www.readbyqxmd.com/read/26659470/the-influence-of-sv40-polya-on-gene-expression-of-baculovirus-expression-vector-systems
#13
Tamer Z Salem, Craig P Seaborn, Colin M Turney, Jianli Xue, Hui Shang, Xiao-Wen Cheng
The simian virus 40 polyadenylation signal (SV40 polyA) has been routinely inserted downstream of the polyhedrin promoter in many baculovirus expression vector systems (BEVS). In the baculovirus prototype Autographa californica multiple nucleopolyhedrovirus (AcMNPV), the polyhedrin promoter (very late promoter) transcribes its gene by a viral RNA polymerase therefore there is no supporting evidence that SV40 polyA is required for the proper gene expression under the polyhedrin promoter. Moreover, the effect of the SV40 polyA sequence on the polyhedrin promoter activity has not been tested either at its natural polyhedrin locus or in other loci in the viral genome...
2015: PloS One
https://www.readbyqxmd.com/read/26494478/introduction-of-temperature-sensitive-helper-and-donor-plasmids-into-bac-to-bac-baculovirus-expression-systems
#14
Zhihong Huang, Ao Li, Mengjia Pan, Wenbi Wu, Meijin Yuan, Kai Yang
In the baculovirus shuttle vector (bacmid) system, a helper plasmid and a donor plasmid are employed to insert heterologous genes into a cloned baculovirus genome via Tn7 transposition in Escherichia coli. The helper and donor plasmids are usually cotransfected with constructed bacmids into insect cells, which will lead to integration of these plasmids into the viral genome, and hence to the production of defective virions. In this study, to facilitate the preparation of plasmid-free recombinant bacmids, we modified a set of helper and donor plasmids by replacing their replication origins with that of a temperature-sensitive (ts) plasmid, pSIM6...
October 2015: Virologica Sinica
https://www.readbyqxmd.com/read/26458221/improved-production-efficiency-of-virus-like-particles-by-the-baculovirus-expression-vector-system
#15
Javier López-Vidal, Silvia Gómez-Sebastián, Juan Bárcena, Maria del Carmen Nuñez, Diego Martínez-Alonso, Benoit Dudognon, Eva Guijarro, José M Escribano
Vaccines based on virus-like particles (VLPs) have proven effective in humans and animals. In this regard, the baculovirus expression vector system (BEVS) is one of the technologies of choice to generate such highly immunogenic vaccines. The extended use of these vaccines for human and animal populations is constrained because of high production costs, therefore a significant improvement in productivity is crucial to ensure their commercial viability. Here we describe the use of the previously described baculovirus expression cassette, called TB, to model the production of two VLP-forming vaccine antigens in insect cells...
2015: PloS One
https://www.readbyqxmd.com/read/26380415/-modified-baculovirus-system-for-high-expression-of-bombyx-mori-bidensovirus-ns1-in-silkworm
#16
Guohui Li, Mangmang Li, Qian Zhou, Zhaoyang Hu, Qi Tang, Qin Yao
To improve the expression of heterologous genes using baculovirus expression system, we constructed a novel shuttle vector based on the Bm-Bacmid. In the Bm-Bacmid, partial sequences of Chitinase and Cystein Protease were replaced with a tandem cassette of Cm and egfp through homologous recombination. Bombyx mori bidensovirus (BmBDV) ns1 under the control of polyhedrin promoter was inserted into the modified Bm-bacmid by transposition. For comparison, BmBDV ns1 under the control of polyhedrin promoter was also cloned in the wild type Bm-bacmid...
April 2015: Sheng Wu Gong Cheng Xue Bao, Chinese Journal of Biotechnology
https://www.readbyqxmd.com/read/26296090/a-novel-neurotoxin-gene-ar1b-recombination-enhances-the-efficiency-of-helicoverpa-armigera-nucleopolyhedrovirus-as-a-pesticide-by-inhibiting-the-host-larvae-ability-to-feed-and-grow
#17
Huan Yu, Jiao Meng, Jian Xu, Tong-Xian Liu, Dun Wang
A recombinant Helicoverpa armigera nucleopolyhedrovirus (HearNPV), Ar1b-HearNPV, was constructed and identified as an improved bio-control agent of Helicoverpa armigera larvae. The HearNPV polyhedrin promoter was used to express the insect-specific neurotoxin gene, ar1b, which was originally isolated from the Australian funnel-web spider (Atrax robustus). RT-PCR and Western blotting analysis showed that both the ar1b transcript and protein were produced successfully in Ar1b-HearNPV-infected HzAM1 cells. In order to investigate the influence of foreign gene insertion in HearNPV, including the ar1b gene, chloramphenicol resistance gene, lacZ, kanamycin resistance gene, and the gentamicin resistance gene, two virus strains (HZ8-HearNPV and wt-HearNPV) were used as controls in the cell transfection analysis...
2015: PloS One
https://www.readbyqxmd.com/read/25674620/baculovirus-mediated-transduction-analysis-of-vesicular-stomatitis-virus-glycoprotein-pseudotyping
#18
Sujit M Kolangath, S H Basagoudanavar, M Hosamani, P Saravanan, R P Tamil Selvan
The recombinant baculoviruses were constructed to investigate the necessity of VSV-G pseudotyping for mammalian cell transduction. The viruses were designed to express green fluorescent protein (GFP) gene under the control of cytomegalovirus promoter, with or without pseudotyping with VSV-G. VSV-G was placed under the control of polyhedrin promoter that is recognized by insect cells, allowing the formation of pseudotyped baculovirus. The study findings demonstrate that the pseudotyping of baculovirus significantly enhanced transduction efficiency compared to non-pseudotyped baculovirus, resulting in consequent distinction in the expression of GFP in mammalian cells...
December 2014: Virusdisease
https://www.readbyqxmd.com/read/25371919/characterization-of-recombinant-expression-of-bombyx-mori-bidensovirus-ns1-using-a-modified-vector
#19
Guohui Li, Mangmang Li, Peng Wang, Zhaoyang Hu, Qin Yao, Qi Tang, Keping Chen
ns1 gene of Bombyx mori bidensovirus (BmBDV) consisted of 951 nucleotides encoding a deduced 316-amino aicd protein. In this study, the gene was cloned and fused in frame with a N-terminal 6×His tag under control of the polyhedrin promoter, which was transposed into the mini-attTn7 locus of a modified baculovirus vector. Transfection of Sf-9 cells with the resulting recombinant DNA was performed to prepare recombinant virus and the resultant supernatant of transfection with fluorescent signal was harvested...
2014: Acta Biochimica Polonica
https://www.readbyqxmd.com/read/25300342/analysis-of-bmnpv-orf101-disruption-orf101-is-essential-for-mediating-budded-virus-production
#20
Huiqing Chen, Mei Li, Weijun Mai, Qi Tang, Guohui Li, Keping Chen, Yajing Zhou
In our previous study, Orf101 (Bm101) of Bombyx mori nucleopolyhedrovirus (BmNPV) was identified as a component of the budded virions important for viral late gene expression. In this study we demonstrate that Bm101 is actually a previously unrecognized core gene and that it is essential for mediating budded virus production. To determine the role of Bm101 in the baculovirus life cycle, a Bm101 knockout bacmid containing the BmNPV genome was generated through homologous recombination in Escherichia coli. Furthermore, a Bm101 repair bacmid was constructed by transposing the Bm101 open reading frame with its native promoter region into the polyhedrin locus of the Bm101 knockout bacmid...
December 2014: Cytotechnology
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