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Structural analysis of the actinophage phi C31 attachment site
Nucleic Acids Research
|October 11, 1991
Summary
Site-specific recombination enables actinophage phi C31 lysogenisation in S. coelicolor J 1501. Researchers identified a three-base-pair common sequence at attachment sites, crucial for this phage-host DNA integration process.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Actinophage phi C31 integrates into the S. coelicolor J 1501 chromosome via lysogenisation.
- This process involves site-specific recombination, a mechanism essential for viral genome integration.
Purpose of the Study:
- To elucidate the molecular mechanism of actinophage phi C31 integration into the S. coelicolor J 1501 host chromosome.
- To identify and characterize the DNA sequences involved in the site-specific recombination event.
Main Methods:
- Cloning of DNA segments containing phage attachment sites, host chromosome attachment sites, and prophage insertion junctions.
- Determination of the nucleotide sequences of these cloned DNA segments.
Main Results:
- The attachment sites (att) on the host chromosome and phage genome share a minimal common core sequence of three base pairs.
- Direct and inverted repeats were identified adjacent to the core sequences, suggesting potential protein binding sites.
Conclusions:
- The integration of actinophage phi C31 into S. coelicolor J 1501 is mediated by a highly specific recombination event.
- The identified short common sequence and flanking repeats are likely critical for the recognition and binding of recombination machinery proteins.