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Plasmids in Corynebacterium glutamicum and their molecular classification by comparative genomics
Andreas Tauch1, Alfred Pühler, Jörn Kalinowski
1Institut für Genomforschung, Universität Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany. andreas.tauch@genetik.uni-bielefeld.de
Journal of Biotechnology
|September 2, 2003
Summary
This study characterizes endogenous plasmids in Corynebacterium glutamicum, finding 24 distinct plasmids, some conferring antibiotic resistance. These plasmids are classified into four families based on replication mechanisms, aiding genetic engineering.
Area of Science:
- Microbiology
- Molecular Biology
- Biotechnology
Background:
- Endogenous plasmids and selectable markers are crucial for developing efficient recombinant DNA technology in industrial microorganisms.
- Corynebacterium glutamicum is a key industrial microorganism for amino acid production.
Purpose of the Study:
- To summarize current knowledge on endogenous plasmids in amino acid-producing Corynebacterium glutamicum isolates.
- To classify these plasmids based on their molecular genetic organization and replication mechanisms.
Main Methods:
- Screening of Corynebacterium glutamicum isolates to identify endogenous plasmids.
- Characterization of plasmid size, presence of resistance determinants, and molecular genetic organization.
- Sequencing of 12 plasmid genomes and analysis of replication initiator proteins.
Main Results:
- A total of 24 different endogenous plasmids were identified, ranging from 2.4 to 95 kb.
- Four plasmids carried resistance determinants against chloramphenicol, tetracycline, streptomycin-spectinomycin, and sulfonamides.
- Plasmids were classified into four distinct families based on replication mechanisms and initiator protein similarity.
Conclusions:
- Endogenous plasmids in Corynebacterium glutamicum are diverse and can carry valuable resistance markers.
- The classification into four families provides a framework for understanding plasmid replication and for genetic engineering applications in Corynebacterium glutamicum.