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Mitotic apparatus: the selective extraction of protein with mild acid
Abstract:
The treatment of isolated mitotic apparatus with mild (pH 3) hydrochloric acid results in the extraction of less than 10 percent of its protein, accompanied by the selective morphological disappearance of the microtubules. The same extraction can be shown to dissolve outer doublet microtubules from sperm flagella. A protein with points of similarity to the flagellar microtubule protein is the major component of the extract from mitotic apparatus.
Insights
Mild acid treatment extracts proteins from the mitotic apparatus, dissolving microtubules. The major extracted protein resembles flagellar microtubule protein, suggesting a shared component in cell division and motility structures.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Microtubules are essential cytoskeletal components involved in cell division and motility.
- The mitotic apparatus contains microtubules crucial for chromosome segregation.
- Sperm flagella utilize microtubules for their propulsive movement.
Purpose of the Study:
- To investigate the protein composition of the mitotic apparatus.
- To determine the effect of mild acid treatment on microtubule structures within the mitotic apparatus and sperm flagella.
- To identify proteins extracted from the mitotic apparatus and compare them to flagellar microtubule proteins.
Main Methods:
- Isolated mitotic apparatus and sperm flagella were treated with mild hydrochloric acid (pH 3).
- Protein extraction yields were quantified.
- Morphological changes in microtubules were observed.
- Proteins in the acid extract were analyzed and compared to flagellar microtubule proteins.
Main Results:
- Mild acid treatment (pH 3) extracted less than 10% of the mitotic apparatus protein.
- This treatment selectively caused the morphological disappearance of microtubules in the mitotic apparatus.
- The same acid treatment dissolved outer doublet microtubules from sperm flagella.
- A protein similar to flagellar microtubule protein was identified as the major component in the mitotic apparatus extract.
Conclusions:
- Microtubules within the mitotic apparatus are sensitive to mild acidic conditions.
- The protein composition of mitotic apparatus microtubules shares similarities with flagellar outer doublet microtubules.
- This suggests a conserved protein component involved in microtubule structure and function across different cellular contexts.