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Adherence of Mycoplasma pneumoniae to glass surfaces
Abstract:
Attachment of M. pneumoniae to glass was quantitated in an experimental system enabling the settling down of [3H]palmitic acid-labeled cells onto glass cover slips. Attachment of mycoplasmas suspended in buffer increased with temperature, decreased with higher ionic strength, and showed a maximum at about pH 5.5. The findings suggest a participation of ionic bonds in the attachment process. Trypsin did not detach glass-bound mycoplasmas, and treatment of the cells with glutaraldehyde did not reduce their attachment to glass, suggesting that membrane components other than proteins may be involved in the attachment. Low concentrations (up to 20 mg/ml) of bovine serum albumin buffer. However, during the next few hours, attachment increased far above the bovine serum albumin control. This marked increase was reduced by more than half in the presence of chloramphenicol. Increased attachment was also observed when glucose (0.1 to 2 mg/ml) was added to the bovine serum albumin-containing buffer. The findings suggest different mechanisms for the attachment in protein-free buffer and in growth medium or glucose-containing bovine serum albumin buffer, respectively. The latter apparently requires metabolic activity of the mycoplasmas.
Insights
Mycoplasma pneumoniae attachment to glass involves ionic bonds and is influenced by pH and ionic strength. Glucose or serum albumin triggers a metabolically dependent attachment mechanism.
Area of Science:
- Microbiology
- Cell Biology
Background:
- Mycoplasma pneumoniae is a significant human pathogen.
- Understanding M. pneumoniae attachment is crucial for preventing infection.
Purpose of the Study:
- To investigate the mechanisms of M. pneumoniae attachment to glass surfaces.
- To differentiate between protein-free buffer and growth medium attachment.
Main Methods:
- Quantifying attachment of [3H]palmitic acid-labeled M. pneumoniae to glass cover slips.
- Assessing the effects of temperature, ionic strength, pH, trypsin, glutaraldehyde, bovine serum albumin, glucose, and chloramphenicol on attachment.
Main Results:
- Attachment in protein-free buffer is influenced by ionic bonds, pH (optimum ~5.5), and ionic strength.
- Proteins may not be the primary attachment mediators, as trypsin and glutaraldehyde treatments had limited effects.
- In the presence of bovine serum albumin or glucose, attachment increased over time and required metabolic activity, indicated by chloramphenicol inhibition.
Conclusions:
- M. pneumoniae exhibits distinct attachment mechanisms depending on the buffer composition.
- Ionic interactions are important in protein-free environments.
- A metabolically active process, likely involving cellular synthesis, mediates attachment in nutrient-rich conditions.