Related Experiment Video
Updated: Feb 13, 2026
15:05
Deciphering the Structural Effects of Activating EGFR Somatic Mutations with Molecular Dynamics Simulation
Published on: May 20, 2020
9.3K
Loading-device effects on the protein-unfolding mechanisms using molecular-dynamic simulations.
Myeongsang Lee1, Hyunsung Choi2, Gwonchan Yoon3
1Institute of Advanced Machinery Design Technology, Korea University, 02841, Seoul, Republic of Korea.
Journal of Molecular Graphics & Modelling
|March 20, 2018
Summary
This study used molecular dynamics simulations to investigate how different loading devices affect protein unfolding. Understanding these effects is crucial for analyzing biomolecular structures and properties.
Area of Science:
- Biophysics
- Computational Biology
- Structural Biology
Background:
- Force spectroscopy techniques like atomic force microscopy (AFM) are vital for characterizing biomolecular structure and biomaterial properties.
- Molecular dynamics (MD) simulations offer complementary insights into biomolecular structures and unfolding behaviors.
- Current understanding of biomolecular unfolding is limited by the influence of various loading devices.
Purpose of the Study:
- To investigate the anisotropic unfolding behavior of ubiquitin protein using computational methods.
- To characterize the impact of different loading device stiffnesses ('soft' and 'stiff') on protein unfolding pathways.
- To enhance the comprehension of biomolecular unfolding mechanisms under varying mechanical conditions.
Main Methods:
- All-atom and steered molecular dynamics (SMD) simulations were employed.
- Simulations considered the effects of different loading device characteristics (soft vs. stiff).
- Analysis focused on hydrogen bond breakage and changes in geometric secondary structures.
Main Results:
- Anisotropic unfolding pathways of ubiquitin were identified.
- The study revealed distinct unfolding behaviors influenced by the stiffness of the loading device.
- Key structural changes, including hydrogen bond disruption and secondary structure alterations, were observed.
Conclusions:
- The choice of loading device significantly impacts the analysis of biomolecular structural composition and characteristics.
- Computational simulations provide valuable insights into the nuances of protein unfolding.
- This research underscores the importance of considering loading device effects in biomolecular studies.
Related Concept Videos
01:37The Unfolded Protein Response
6.5K
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
6.5K
03:00Molecular Chaperones and Protein Folding
19.9K
The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
The...
19.9K
03:00Molecular Chaperones and Protein Folding
15.1K
15.1K
01:31Regulation of the Unfolded Protein Response
3.1K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
3.1K
01:58Mechanical Protein Functions
5.7K
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
5.7K
02:00Molecular Models
43.9K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
43.9K