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Relationship between tektins and intermediate filament proteins: an immunological study.
1Department of Cell Biology and Neuroanatomy, University of Minnesota, Minneapolis 55455.
Cell Motility and the Cytoskeleton
|January 1, 1989
Summary
Sea urchin tektins show an immunological relationship with vertebrate keratins, suggesting shared epitopes. This cross-reactivity indicates a conserved structural or functional link between these intermediate filament proteins.
Area of Science:
- Cell Biology
- Biochemistry
- Immunology
Background:
- Tektins are flagellar proteins, and their relationship to intermediate filament proteins is not well understood.
- Intermediate filaments, such as keratins, play crucial roles in cellular structure and integrity.
Purpose of the Study:
- To investigate the immunological relationship between sea urchin tektins and vertebrate intermediate filament proteins, specifically keratins.
- To determine the extent of cross-reactivity and identify common epitopes between tektins and keratins.
Main Methods:
- Generation of affinity-purified antibodies against sea urchin tektins (A, B, C).
- Immunofluorescence and immunoelectron microscopy to detect cross-reactivity with intermediate filament-like structures in vertebrate cell lines.
- Immunoblot analysis to identify cross-reacting proteins and assess epitope sharing after enzymatic digestion.
Main Results:
- Antibodies against tektins cross-reacted with intermediate filament-like arrays in vertebrate cell lines.
- Anti-tektin B antibodies recognized specific proteins in HeLa and LLC-PK1 cells, identified as keratins.
- Quantitative immunoblot analysis showed that tektins share epitopes with the end domains of certain keratins, with rapid elimination of cross-reactivity upon digestion.
Conclusions:
- Tektins and keratins exhibit a significant degree of immunological relatedness.
- The findings suggest that tektins and keratins may share common structural or functional domains, particularly at their termini.