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Heterogeneity of the lipopolysaccharide from Proteus mirabilis O27
Abstract:
Two lipopolysaccharides (LPS) were obtained by phenol-water procedure from Proteus mirabilis O27 strain -- LPS I as sediment and LPS II from the supernatant after ultracentrifugation. There was shown a distinct predominance of the O-specific material in LPSII, whereas in LPS I the core material prevailed. Heterogeneity of the P. mirabilis.O27 lipopolysaccharide was confirmed by the sodium dodecyl sulphate-polyacrylamide gel electrophoresis, in crossed immunoelectrophoresis and by the column chromatography.
Insights
Researchers isolated two lipopolysaccharides (LPS) from Proteus mirabilis O27. LPS II showed more O-specific material, while LPS I contained more core material, confirming the heterogeneity of this bacterial lipopolysaccharide.
Area of Science:
- Microbiology
- Immunochemistry
- Biochemistry
Background:
- Lipopolysaccharides (LPS) are critical components of the outer membrane of Gram-negative bacteria.
- Proteus mirabilis is a significant opportunistic pathogen.
- Understanding LPS structure is vital for developing targeted therapies and diagnostics.
Purpose of the Study:
- To isolate and characterize two distinct lipopolysaccharide (LPS) fractions from Proteus mirabilis O27.
- To investigate the compositional differences between the isolated LPS fractions.
- To confirm the heterogeneity of P. mirabilis O27 LPS.
Main Methods:
- Phenol-water extraction method for LPS isolation.
- Ultracentrifugation to separate LPS fractions.
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE).
- Crossed immunoelectrophoresis.
- Column chromatography.
Main Results:
- Two LPS fractions, LPS I (sediment) and LPS II (supernatant), were successfully isolated.
- LPS II exhibited a predominance of O-specific polysaccharide chains.
- LPS I was characterized by a higher proportion of core oligosaccharide material.
- SDS-PAGE, crossed immunoelectrophoresis, and column chromatography confirmed the heterogeneity of P. mirabilis O27 LPS.
Conclusions:
- Proteus mirabilis O27 produces heterogeneous lipopolysaccharides.
- Distinct LPS fractions can be isolated with differing O-specific and core material compositions.
- These findings contribute to the detailed structural understanding of P. mirabilis LPS.