Possible Mechanism of Adenovirus Generation from a Cloned Viral Genome Tagged with Nucleotides at Its Ends
| Autor: | Miho Terashima, Hiromitsu Fukuda, Michiko Koshikawa, Izumu Saito, Yumi Kanegae |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
DNA Replication
viruses Genetic Vectors Green Fluorescent Proteins Immunology Oligonucleotides Replication Origin Genome Viral Biology Transfection Virus Replication Microbiology Genome Virus Cell Line Viral vector chemistry.chemical_compound Virology Humans Oligonucleotide Adenoviruses Human DNA Restriction Enzymes Cosmids Molecular biology Restriction enzyme Viral replication chemistry DNA Viral Cosmid DNA |
| Zdroj: | Microbiology and Immunology. 50:643-654 |
| ISSN: | 0385-5600 |
| DOI: | 10.1111/j.1348-0421.2006.tb03829.x |
| Popis: | The entire cloned human adenovirus type 5 (Ad5) genome is known to be able to generate infectious virus after transfection into 293 cells when the both ends of the genome are exposed by digestion with appropriate restriction enzymes. However, when one or both ends of the genome are tagged with nucleotides and are not intact, whether the tagged end of the viral genome was remained tagged or corrected to be intact during the generation of viral clones has been unclear and, if such oligonucleotide removal occurs, how does the virus remove these tagged sequences and thereby restore its proper structure? Here, we show in our semi-quantitative study that the generation efficiency of virus clones decreases depending on the length of nucleotide tags at the both ends and that both the oligonucleotide tags were precisely removed during virus generation with restoration of the proper terminal sequences. Interestingly the viral genome of which one end was tagged, while the other was attached about 12-kb sequences, did generate intact viral clones at a reduced but significant efficiency. From these results, we here propose a possible mechanism whereby the terminal-protein-deoxycytidine complex enters from the enzyme-cleaved end and reaches deoxyguanine at the initiating position of DNA synthesis in vivo. A replication origin at one end, embedded deeply in double-stranded DNA, can be activated by two cycles of one-directional full-length DNA synthesis initiated by the other exposed replication origin about 30 kilobases away. We also describe new cassette cosmids which can use not only Pac I but also Bst BI for construction of an adenovirus vector, without reducing construction efficiency. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text