Characterization of recombinant Autographa californica nuclear polyhedrosis virus (NPV) expressing the beta-galactosidase gene in both Sf21 and Bm5 cells by Bombyx mori NPV p143 helicase gene. 1997

B R Jin, and H J Yoon, and P V Choudary, and S K Kang
Laboratory of Insect Genetic Engineering, National Sericulture & Entomology Research Institute, Suwon, Korea.

Genomic DNA of recombinant AcNPV expressing beta-galactosidase was cotransfected with p143 helicase gene of BmNPV into Sf21 cells. Ac-Bm hybrid viruses capable of replicating in both Bm5 and Sf21 cells were isolated. Ac-Bm hybrid viruses expressing beta-galactosidase either at the highest (Ac-Bm hybrid virus-HE) or lowest (Ac-Bm hybrid virus-LE) level were chosen for the characterization of beta-galactosidase expression in Bm5 and Sf21 cells. Expression level of beta-galactosidase and replication of Ac-Bm hybrid virus-HE in Sf21 cells were nearly identical to those of recombinant AcNPV. Furthermore, replication of Ac-Bm hybrid virus-HE in Bm5 cells was similar to that of wild-type BmNPV, and Ac-Bm hybrid virus-HE clearly expressed beta-galactosidase in Bm5 cells. However, expression of beta-galactosidase by Ac-Bm hybrid virus-HE in Bm5 cells was significantly lower than that expressed in Sf21 cells. The titer of Ac-Bm hybrid virus-HE determined by plaque assays in Bm5 cells was similar to that determined in Sf21 cells, but the plaque size formed by Ac-Bm hybrid virus-HE in Bm5 cells was apparently smaller than that formed in Sf21 cells. In addition, expression levels and virus titers of Ac-Bm hybrid virus-LE in Sf21 and Bm5 were significantly lower than those of Ac-Bm hybrid virus-HE. Therefore, DNA sequences were determined for the region of the p143 gene controlling the host range in Ac-Bm hybrid viruses. The results showed that the deduced amino acid sequences of Ac-Bm hybrid virus-HE were almost identical to those of BmNPV. There were differences only in amino acids at positions 461 and 470, whereas those of Ac-Bm hybrid virus-LE were different at position 461, 470, 514, and 528 from those of BmNPV. In conclusion, our results clearly demonstrated that Ac-Bm hybrid virus-HE has an additional advantage of expanded host range for producing recombinant proteins.

UI MeSH Term Description Entries
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D010948 Viral Plaque Assay Method for measuring viral infectivity and multiplication in CULTURED CELLS. Clear lysed areas or plaques develop as the VIRAL PARTICLES are released from the infected cells during incubation. With some VIRUSES, the cells are killed by a cytopathic effect; with others, the infected cells are not killed but can be detected by their hemadsorptive ability. Sometimes the plaque cells contain VIRAL ANTIGENS which can be measured by IMMUNOFLUORESCENCE. Bacteriophage Plaque Assay,Assay, Bacteriophage Plaque,Assay, Viral Plaque,Assays, Bacteriophage Plaque,Assays, Viral Plaque,Bacteriophage Plaque Assays,Plaque Assay, Bacteriophage,Plaque Assay, Viral,Plaque Assays, Bacteriophage,Plaque Assays, Viral,Viral Plaque Assays
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D004265 DNA Helicases Proteins that catalyze the unwinding of duplex DNA during replication by binding cooperatively to single-stranded regions of DNA or to short regions of duplex DNA that are undergoing transient opening. In addition, DNA helicases are DNA-dependent ATPases that harness the free energy of ATP hydrolysis to translocate DNA strands. ATP-Dependent DNA Helicase,DNA Helicase,DNA Unwinding Protein,DNA Unwinding Proteins,ATP-Dependent DNA Helicases,DNA Helicase A,DNA Helicase E,DNA Helicase II,DNA Helicase III,ATP Dependent DNA Helicase,ATP Dependent DNA Helicases,DNA Helicase, ATP-Dependent,DNA Helicases, ATP-Dependent,Helicase, ATP-Dependent DNA,Helicase, DNA,Helicases, ATP-Dependent DNA,Helicases, DNA,Protein, DNA Unwinding,Unwinding Protein, DNA,Unwinding Proteins, DNA
D004274 DNA, Recombinant Biologically active DNA which has been formed by the in vitro joining of segments of DNA from different sources. It includes the recombination joint or edge of a heteroduplex region where two recombining DNA molecules are connected. Genes, Spliced,Recombinant DNA,Spliced Gene,Recombinant DNA Research,Recombination Joint,DNA Research, Recombinant,Gene, Spliced,Joint, Recombination,Research, Recombinant DNA,Spliced Genes
D004279 DNA, Viral Deoxyribonucleic acid that makes up the genetic material of viruses. Viral DNA
D005822 Genetic Vectors DNA molecules capable of autonomous replication within a host cell and into which other DNA sequences can be inserted and thus amplified. Many are derived from PLASMIDS; BACTERIOPHAGES; or VIRUSES. They are used for transporting foreign genes into recipient cells. Genetic vectors possess a functional replicator site and contain GENETIC MARKERS to facilitate their selective recognition. Cloning Vectors,Shuttle Vectors,Vectors, Genetic,Cloning Vector,Genetic Vector,Shuttle Vector,Vector, Cloning,Vector, Genetic,Vector, Shuttle,Vectors, Cloning,Vectors, Shuttle
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001616 beta-Galactosidase A group of enzymes that catalyzes the hydrolysis of terminal, non-reducing beta-D-galactose residues in beta-galactosides. Deficiency of beta-Galactosidase A1 may cause GANGLIOSIDOSIS, GM1. Lactases,Dairyaid,Lactaid,Lactogest,Lactrase,beta-D-Galactosidase,beta-Galactosidase A1,beta-Galactosidase A2,beta-Galactosidase A3,beta-Galactosidases,lac Z Protein,Protein, lac Z,beta D Galactosidase,beta Galactosidase,beta Galactosidase A1,beta Galactosidase A2,beta Galactosidase A3,beta Galactosidases

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