Related Experiment Video
Updated: Apr 10, 2026
07:55
Flexural Rigidity Measurements of Biopolymers Using Gliding Assays
Published on: November 9, 2012
11.3K
Rigidity versus flexibility: the dilemma of understanding protein thermal stability
Andrey Karshikoff1, Lennart Nilsson1, Rudolf Ladenstein1
1Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden.
The FEBS Journal
|June 16, 2015
Summary
Protein thermostability is not solely dependent on rigidity; flexibility and internal fluctuations play crucial roles. This study re-evaluates protein rigidity and flexibility using advanced computational methods.
Area of Science:
- Biochemistry
- Structural Biology
- Computational Biology
Background:
- Protein thermostability research often presents a dualistic view, linking it to rigidity and reduced flexibility.
- However, experimental and simulation studies challenge this, suggesting thermal tolerance isn't always correlated with suppressed internal mobility.
Purpose of the Study:
- To critically re-examine the concepts of protein mobility/flexibility versus rigidity.
- To investigate the influence of high temperatures on enzyme active sites and overall activity.
Main Methods:
- Molecular dynamics calculations of heat capacity and conformational entropy.
- Analysis of salt bridge networks and electrostatic interactions in folded and unfolded states.
- Application of network theories to protein thermostability.
Main Results:
- Rigidity and flexibility are not static properties but involve relative motion at specific time scales.
- A strict separation of rigid and flexible protein regions may not accurately reflect reality.
- High temperature effects on enzyme active sites and activity were considered.
Conclusions:
- Protein thermostability is a complex interplay of factors beyond simple rigidity.
- A dynamic perspective incorporating fluctuations and mobility is essential for understanding thermal tolerance.
- Further research into network theories and active site dynamics is warranted.
Keywords:
active site floppinesscomputer simulationconformational entropyelectrostatic interactionsenzyme activityfluctuationsheat capacitynetwork theoriesthermostabilityMore Related Videos
08:13Differential Scanning Calorimetry — A Method for Assessing the Thermal Stability and Conformation of Protein Antigen
Published on: March 4, 2017
40.8K
11:11Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
Published on: May 2, 2016
11.7K
Related Concept Videos
01:19Thermal Strain
3.2K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
3.2K
01:09Thermal Stress
3.7K
If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
3.7K
01:29Diversity of Archaea IV
609
Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist...
609
01:27Thermal expansion and Thermal stress: Problem Solving
2.4K
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
2.4K
01:26Polymer Classification: Stereospecificity
3.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
3.4K
01:53RNA Stability
36.4K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
36.4K