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[Isolation and characterization of functional replication origin from Streptomyces avermitilis]
1Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, the Chinese Academy of Sciences, Shanghai 200032, China. wjiang@iris.sipp.ac.cn
Sheng Wu Hua Xue Yu Sheng Wu Wu Li Xue Bao Acta Biochimica Et Biophysica Sinica
|November 6, 2002
Summary
Researchers identified a DNA fragment from Streptomyces avermitilis containing essential replication genes. This fragment enables autonomous replication in related bacteria, offering insights into DNA replication initiation.
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Context:
- Eubacteria possess conserved gene clusters near oriC, crucial for DNA replication.
- The dnaA and dnaN genes are vital for replication initiation and DNA polymerase function.
Purpose:
- To clone and characterize a DNA fragment containing parts of dnaA and dnaN genes from Streptomyces avermitilis.
- To investigate the role of DnaA boxes in the intergenic region for replication initiation.
- To assess the autonomous replication activity of the cloned fragment in Streptomyces lividans.
Summary:
- A 1.4 kb DNA fragment from S. avermitilis, including partial dnaA and dnaN genes, was cloned using degenerate PCR.
- Sequence analysis revealed 19 conserved DnaA boxes in the intergenic region, essential for replication.
- The fragment conferred autonomous replication in S. lividans, indicating functional oriC elements.
Impact:
- Elucidates the mechanism of replication initiation in S. avermitilis.
- Identifies conserved regulatory elements (DnaA boxes) critical for bacterial DNA replication.
- Provides a foundation for developing novel tools for genetic manipulation in Streptomyces species.