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Investigation of Structural Peculiarities of Smooth Muscle Titin Aggregates, Formed under Different In Vitro
M A Timchenko1, A A Timchenko2, A S Kazakov3
1Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow region, Russia.
Bulletin of Experimental Biology and Medicine
|September 12, 2024
Summary
Two types of smooth muscle titin amyloid aggregates share a common cross-β structure but differ in morphology. These structural similarities suggest a common initial aggregation pathway for titin amyloid formation.
Area of Science:
- Biophysics
- Structural Biology
- Biochemistry
Background:
- Amyloid aggregates are implicated in various diseases.
- Titin, a large muscle protein, can form amyloid structures.
- Understanding titin aggregate structure is crucial for disease research.
Purpose of the Study:
- To investigate structural differences between two distinct smooth muscle titin amyloid aggregate types.
- To elucidate the relationship between aggregate morphology and secondary/quaternary structure.
- To understand the initial steps in smooth muscle titin aggregation.
Main Methods:
- Small-angle X-ray scattering (SAXS) to determine aggregate shape and size.
- Fourier transform infrared (FTIR) spectroscopy to analyze protein secondary structure.
- Thioflavin T binding assays to assess aggregate characteristics.
Main Results:
- Both titin aggregate types exhibited a flat-shape morphology via SAXS.
- FTIR spectroscopy revealed no significant differences in secondary structure between the two aggregate types.
- Both aggregate types possess a quaternary cross-β structure, consistent with amyloid formation.
Conclusions:
- The two studied titin aggregates share identical secondary and quaternary cross-β structures.
- Morphological differences arise after the formation of stable, structurally similar supramolecular complexes.
- Ambient conditions likely dictate the final morphology of smooth muscle titin amyloid aggregates.
