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Complete genome sequence of bacteriophage T5
Jianbin Wang1, Yan Jiang, Myriam Vincent
1James D. Watson Institute of Genome Sciences, Zhejiang University, Hangzhou 310008, China.
Virology
|January 22, 2005
Summary
The bacteriophage T5 genome sequence reveals a linear, double-stranded DNA with large terminal repeats. Its genome structure and annotated genes are crucial for its lytic life cycle and DNA replication.
Area of Science:
- Virology
- Genomics
- Molecular Biology
Background:
- Bacteriophage T5 is a virus that infects bacteria.
- Understanding phage genomes is crucial for molecular biology and biotechnology.
- The complete genome sequence of bacteriophage T5 was previously undetermined.
Purpose of the Study:
- To determine the complete genome sequence of bacteriophage T5.
- To analyze the genome structure and identify key genes.
- To investigate the transcriptional regulation mechanisms of bacteriophage T5.
Main Methods:
- DNA sequencing of bacteriophage T5.
- Bioinformatic analysis of the genome sequence.
- Identification and annotation of open reading frames (ORFs).
Main Results:
- The 121,752-bp genome sequence of bacteriophage T5 was determined.
- The DNA is linear, double-stranded, nicked in one strand, and possesses large direct terminal repeats (10,139 bp).
- 61 out of 168 potential ORFs were annotated, primarily encoding enzymes for DNA replication, repair, and nucleotide metabolism; five endonucleases and a split DNA ligase gene were identified.
- A promoter motif for strong promoters was proposed, suggesting control over host RNA polymerase transcription.
Conclusions:
- The bacteriophage T5 genome exhibits a unique structure with significant terminal repeats.
- The identified genes are vital for the phage's lytic cycle and DNA metabolism.
- The proposed promoter motif provides insights into phage gene expression regulation.
- The genome's mosaic structure suggests an origin from a common genetic pool.