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Characterization of new plasmids from methylotrophic bacteria
V Brenner1, I Holubová, O Benada
1Institute of Microbiology, Czechoslovak Academy of Sciences, Prague.
Antonie Van Leeuwenhoek
|July 1, 1991
Summary
Researchers identified plasmids in methanol-utilizing bacteria, including novel ones in Methylobacterium. Plasmid pWU7 was selected for developing a cloning vector for methylotrophs, with successful cointegrates formed and tested for transfer.
Area of Science:
- Microbiology
- Molecular Biology
- Bacterial Genetics
Background:
- Methanol-utilizing bacteria play crucial roles in carbon cycling.
- Understanding their genetic elements, like plasmids, is key to metabolic engineering.
- Plasmids can facilitate gene transfer and provide adaptive traits in bacteria.
Purpose of the Study:
- To screen soil-isolated methanol-utilizing bacteria for plasmids.
- To characterize plasmids from obligate methylotrophs and pink-pigmented facultative methylotrophs (PPFM).
- To construct a novel cloning vector for methylotrophic bacteria using a suitable plasmid.
Main Methods:
- Isolation and screening of bacterial strains from soil.
- Plasmid DNA isolation and purification.
- Restriction enzyme digestion and mapping.
- Construction of cointegrates using E. coli and methylotrophic plasmids.
- Conjugative transfer experiments.
Main Results:
- Plasmid pIH36 (36 kb) was isolated and mapped from Methylomonas sp. strain R103a.
- Four plasmids were detected in Methylobacterium strains: pIB200 (200 kb), pIB14 (14 kb), pWU14 (14 kb), and pWU7 (7.8 kb).
- Plasmid pWU7 was chosen for vector construction due to its small size and unique restriction sites; cointegrates pKWU7A and pKWU7B were successfully formed and tested for transfer.
Conclusions:
- Plasmids are present in diverse methanol-utilizing bacteria.
- Plasmid pWU7 is a promising candidate for developing a cloning vector for methylotrophs.
- The constructed cointegrates demonstrate potential for genetic manipulation in methylotrophic hosts.