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Cytoplasmic helical structure associated with Acholeplasma laidlawii
Abstract:
A distinct spiral protein structure was found in three species of Acholeplasma, but was not found in the Mycoplasma species studied. The spirals, which are 14 nm in width and of variable length from 50 to 300 nm, are formed by a helical arrangement of 7-nm subunits. A rosette-like structure 45 nm in diameter also composed of 7-nm subunits was found in close association with the spirals and may be a taut in vivo form of the spiral. The electrophoretic profile in sodium dodecyl sulfate-polyacrylamide gels indicated that the spirals are composed of a predominant polypeptide with an apparent molecular weight of 100,000. No evidence can be found for inferring actin-like properties for this structure.
Insights
A novel spiral protein structure was identified in Acholeplasma species, distinct from Mycoplasma. This structure, composed of 7-nm subunits, has a unique helical arrangement and molecular weight.
Area of Science:
- Microbiology
- Molecular Biology
- Structural Biology
Background:
- Acholeplasma and Mycoplasma are related bacterial genera.
- Understanding cellular structures is key to bacterial classification and function.
Purpose of the Study:
- To investigate and characterize a unique spiral protein structure observed in Acholeplasma species.
- To compare the structural components of Acholeplasma with those of Mycoplasma.
Main Methods:
- Electron microscopy was used to visualize the spiral and rosette-like structures.
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) was employed to determine the protein composition.
Main Results:
- A distinct spiral protein structure (14 nm width, 50-300 nm length) composed of 7-nm subunits was identified in three Acholeplasma species.
- A rosette-like structure (45 nm diameter) of similar subunits was found associated with the spirals.
- SDS-PAGE revealed a predominant 100,000 molecular weight polypeptide in the spiral structure.
- No actin-like properties were inferred for this structure.
Conclusions:
- Acholeplasma species possess a unique spiral protein structure not found in the studied Mycoplasma species.
- The spiral structure is likely composed of a 100 kDa protein and may exist in a taut in vivo form as a rosette.
- The findings contribute to the understanding of structural diversity within Mollicutes.