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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
Published on: March 5, 2017
Lipid-binding properties of TRIM72
Sunghyen Kim1, Jeonghwa Seo, Young-Gyu Ko
1Department of Molecular Biology, BK21 Graduate Program for RNA Biology, Dankook University, Yongin, Korea.
BMB Reports
|January 28, 2012
Summary
Tripartite motif-containing protein 72 (TRIM72) binds lipids, crucial for skeletal muscle membrane repair. Its structure dynamically changes, impacting lipid binding and sarcolemma repair mechanisms.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Tripartite motif-containing protein 72 (TRIM72) is essential for skeletal muscle membrane repair.
- Understanding TRIM72's molecular mechanisms is key to elucidating sarcolemma damage repair.
Purpose of the Study:
- To investigate the in vitro binding properties of TRIM72 with various lipids.
- To explore the effects of dilution and fluorescence decay on TRIM72's structure and binding capabilities.
Main Methods:
- In vitro lipid binding assays were performed to determine dissociation constants (K(d)) for TRIM72.
- Intrinsic fluorescence spectroscopy was used to monitor changes in TRIM72 structure upon dilution and stirring.
- Time-resolved fluorescence decay analysis assessed concentration-independent structural changes.
Main Results:
- TRIM72 exhibited binding to various lipids with dissociation constants (K(d)) between 88.2 ± 9.9 nM and 550.5 ± 134.5 nM.
- Protein dilution led to an exponential decrease in TRIM72's intrinsic fluorescence, indicating structural changes.
- Fluorescence-decayed TRIM72 maintained its secondary structure but showed significantly reduced lipid binding affinity.
Conclusions:
- TRIM72 undergoes dynamic structural conversions influenced by external stimuli.
- These conformational changes affect TRIM72's lipid-binding properties, offering insights into its role in sarcolemma repair.
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