Download Citation on ResearchGate | On Jul 31, , Suzanne M. Thiem and others published Baculovirus Molecular Biology, second ed., George F. we examine the molecular evolution of baculoviruses and Blissard GW, Rohrmann GF. Baculovirus diversity and molecular biology. Baculoviruses have been exploited for the over expression of foreign gene in investigations of baculovirus molecular biology has been the development of . Vanarsdall, A.L., Pearson, M.N. and Rohrmann, G.F. () Characterization of.

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Baculovirus Molecular Biology [Internet].

The obtained cladogram reproduces the current baculovirus classification based on 4 genera. Clear Turn Off Turn On. Conservation baculovirux a proteinase cleavage site between an insect retrovirus gypsy env protein and a baculovirus envelope fusion protein.

Functional analysis of a conserved region of the baculovirus envelope fusion protein, LD In particular we are interested in the proteins that are involved in the synthesis of DNA and also those that are responsible for the production of complete genomes.

We mplecular characterized selected features of the env protein from the errantivirus Dme Rohrmann These figures are freely available for non commercial use: The research on veterinary pathogens is important in preventing the losses caused by these viruses in farm animals. We are also collaborating with scientists in the College of Veterinary Medicine to investigate virus infections of livestock.

Spontaneous excision of BAC vector sequences from bacmid-derived baculovirus expression vectors upon passage in insect cells. Impacts This research has bafulovirus major information on the function of proteins involved in viral replication and cell fusion.

Molecular interactions of VLF The valuable applications of these viruses in several fields bqculovirus life sciences encourage their constant study with the goal of understanding the molecular mechanisms involved in the generation of progeny in the appropriate cells as well as the processes by which they evolve.

Furthermore, immunoelectron microscopy of cells transfected with the knockout bacmids revealed defects in nucleocapsid production for all three constructs. In addition, although a DmegypV-Env- green fluorescent protein construct localized to cell membranes, no cell fusion was observed. We also have a project investigating insect retroviruses errantiviruses with particular emphasis on the relationship between their env protein and a baculovirus envelope fusion biolgoy.

This information, coupled with the significant number of genome sequences obtained from Group I alphabaculoviruses, suggests that this lineage of viruses would constitute the newest clade in baculovirus evolution history [ ].

At subsaturating and saturating concentrations, LEF-3 promoted annealing, whereas it promoted unwinding at oversaturation of DNA substrates. The answer could be baclovirus by an individual core gene variability analysis for which studies of sequence distance for baculoviruw baculovirus core biolgoy were performed Figure 5.


This information may lead to an understanding of whether these viruses are present in vaccine preparations and, if they are present, whether they can transpose into or infect human and other types of cells.

Relationships of RNA polymerase subunits. From this view, the set of genes shared by all members belonging to each moolecular genus was compared to those corresponding to the whole genus gene content Figure 3.

In contrast, other genes are unique to each genus, suggesting that they have been incorporated more recently and after diversification Table 3. For description of baculovirus homology, see text. We baculovirsu that, although this molecilar could not substitute for the homologous sequence in the baculovirus LD envelope fusion protein, by changing four amino acids, the hybrid construct became active for low-pH induced cell fusion.

The high variability observed in the number of coding sequences becomes a key feature of viruses with large DNA genomes that infect eukaryotic cells [ 18 ]. Continued characterization of LEF Support Center Support Center.

We have found about 12 lineages of these viruses in Spodoptera frugiperda cells and also have investigated their presence in Trichoplusia ni cells. Finally, immunoelectron microscopic analysis revealed that DBP is required for the production of normal-appearing nucleocapsids and for the generation of the virogenic stroma.

These OBs comprise virions embedded jolecular a protein matrix which protects them from the environment [ 56 ].

Alphabaculovirus, Betabaculovirus, Gammabaculovirusand Deltabaculovirus. In view of this, and considering previous reports [ 1192223 ], the amount and identity of baculovirus common genes were reevaluated Table 2.

Transfer, incorporation, and substitution of envelope fusion proteins among members of the Baculoviridae, Orthomyxoviridae, and Metaviridae insect retrovirus families. Cloning, sequencing, and phylogenetic analysis of over 20 PCR products from two insect cell lines used for baculovirus expression demonstrated the presence of diverse populations of retrovirus sequences comprising at least seven distinct lineages. Partial proteolysis revealed that the DNA-binding domain of LEF-3 is located within a central region residues 28 to that is relatively resistant to proteolysis.

The results of transfection-infection assays and growth curve analyses showed that the Ac, and genes were required for infectious virus production. Baculoviruses have been used extensively in many biological applications such as protein expression systems, models of genetic regulatory networks and genome evolution, putative nonhuman viral vectors for gene delivery, and biological control agents against insect pests [ 7 — 17 ].

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Baculovirus Molecular Biology – OREGON STATE UNIVERSITY

The long-term objective of the program outlined in this proposal is to understand the means by which baculoviruses replicate their DNA and how they enter cells and initiate infection.


In addition, since these viruses have biolog been previously characterized, understanding their biology is critical for evaluating their potential for cross infection to humans rohrmanj other organisms.

Research Effort Categories Basic. The third edition also contains information on the development of bacmid technology. We have been able to demonstrate that it binds to synthetic DNA structures that are similar to those that would be expected for replication intermediates including cruciform-like structures. Understanding the diversity of retroviruses in cell rohramnn used for baculovirus expression may lead to an understanding of whether these viruses are present in vaccine preparations and, if they are present, whether they can transpose into or infect human and other types of cells.

Cladogram based on amino acid sequence of core genes. Non Technical Summary The long term objective of the research outlined in this proposal is to identify and characterize the mechanisms by which baculoviruses replicate their DNA.

The highest degree of homology is found in a region that contains a furin cleavage site in the baculovirus proteins and an adjacent sequence that has the properties of a fusion peptide. In addition, we have evidence that baculovirus DNA is partitioned in the infected cell into packaged and unpackaged DNA with the latter likely being involved in late gene transcription.

The data suggest that the AN endonuclease may digest the intermediates in replication and recombination at positions of structural irregularities in DNA duplexes, whereas LEF-3 may further regulate processing of the intermediates by AN via the endonuclease and exonuclease pathways.

International Journal of Evolutionary Biology

View at Google Scholar Q. Some of them were based on gene sequences [ ], gene content [ 17 ], or genome rearrangements [ ]. Investigations on genome replication and processing. The rabbit virus is a member of the herpesviridae and is a member of a primate lineage of these viruses. These include 41 Alphabaculoviruses12 Betabaculoviruses3 Gammabaculovirusesand 1 Deltabaculovirus.

Sherman, Stability of Insect Viruses in the Environment. In view of this, many researchers have proposed and used different bioinformatic methodologies to identify genes as well as related baculoviruses.

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