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Partial purification of a membrane-associated deoxyribonucleic acid complex from Mycoplasma gallisepticum
Abstract:
A Mycoplasma gallisepticum subcellular fraction (P2), which contains the deoxyribonucleic acid replication complex, can be isolated by differential centrifugation of freeze-thaw-lysed cells. The nascent deoxyribonucleic acid is released from P2 by Lubrol-WX, sodium dodecyl sulfate, Pronase, and deoxyribonuclease, but not by saponin, ribonuclease, phospholipase C, or high-frequency sonic treatment. Sonic treatment further fractionates the cell ghost and allows partial purification, on sucrose density gradients, of a deoxyribonucleic acid replication complex attached to the cells' polar membrane-bleb-infrableb structures.
Insights
Researchers isolated the Mycoplasma gallisepticum deoxyribonucleic acid (DNA) replication complex from cell fractions. This complex, attached to membrane structures, was partially purified using sonic treatment and sucrose density gradients.
Area of Science:
- Microbiology
- Molecular Biology
- Cell Biology
Background:
- Mycoplasma gallisepticum is a significant avian pathogen.
- Understanding its DNA replication mechanisms is crucial for developing control strategies.
- Subcellular fractions offer a route to study specific cellular processes.
Purpose of the Study:
- To isolate and characterize the deoxyribonucleic acid (DNA) replication complex of Mycoplasma gallisepticum.
- To identify methods for releasing nascent DNA from the replication complex.
- To investigate the association of the replication complex with cellular structures.
Main Methods:
- Differential centrifugation of freeze-thaw-lysed Mycoplasma gallisepticum cells to obtain subcellular fraction P2.
- Treatment of fraction P2 with various agents (Lubrol-WX, SDS, Pronase, DNase, saponin, RNase, phospholipase C, sonic treatment) to release nascent DNA.
- Sucrose density gradient centrifugation for partial purification of the DNA replication complex.
Main Results:
- A subcellular fraction (P2) containing the DNA replication complex was isolated.
- Nascent DNA was released from P2 by specific detergents and enzymes, including Lubrol-WX, sodium dodecyl sulfate, Pronase, and deoxyribonuclease.
- Sonic treatment facilitated further fractionation and partial purification of the DNA replication complex, revealing its attachment to polar membrane-bleb-infrableb structures.
Conclusions:
- The deoxyribonucleic acid replication complex of Mycoplasma gallisepticum can be isolated and partially purified.
- Specific agents are effective in releasing nascent DNA from this complex.
- The replication complex is associated with distinct cellular membrane structures.