Tertiary Structure Unfolding
Tertiary Structure Unfolding - Related Videos
01:37
The Unfolded Protein Response
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2023
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...
01:21
Tertiary Healthcare System
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2023
Specialized care provided over an extended period is called tertiary care. Usually, a primary or secondary care physician will refer a patient to tertiary care. A patient's maximum physical and mental function is restored in tertiary care, which is caused due to the impact of a chronic illness or condition. Tertiary care aims to achieve the highest level of functioning possible while managing chronic illness. For example, a patient who falls and fractures their hip will need secondary care to...
02:38
Assessing Bacterial Chaperone Activity via Thermal Unfolding of a Model Protein
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2025
Source: Dahl, J. et al. Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo. J. Vis. Exp. (2016)This video demonstrates a fluorescence spectrophotometer-based assay to evaluate chaperone activity on a substrate protein under acid and heat stress. It outlines the steps for monitoring substrate unfolding and aggregation through light scattering, comparing conditions with and without the chaperone.
09:48
Neural Activity Propagation in an Unfolded Hippocampal Preparation with a Penetrating Micro-electrode Array
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Cited by 2 •
2015
We have developed an in vitro unfolded hippocampus which preserves CA1-CA3 array of neurons. Combined with the penetrating micro-electrode array, neural activity can be monitored in both the longitudinal and transverse orientations. This method provides advantages over hippocampal slice preparations as the propagation in the entire hippocampus can be recorded simultaneously.
01:12
Nomenclature of Secondary and Tertiary Amines
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2025
The secondary and tertiary amines are derivatives of ammonia, where two and three of its hydrogens are replaced by alkyl groups, respectively. Secondary and tertiary amines can be symmetrical with identical alkyl groups attached to the nitrogen atom or unsymmetrical when more than one type of alkyl group is present. The standard nomenclature of secondary and tertiary amines is similar to the names given to the primary amines. They are generally named alkylamines. As depicted in Figure 1, for...
FAQs
The main structural changes arise when heat, extreme pH, chemical denaturants, or altered solvent conditions disturb noncovalent interactions that hold a protein’s three-dimensional arrangement together. These changes can weaken the network stabilizing the folded state without substantially changing the amino acid sequence. Consequently, biological activity may decline even though the protein’s primary sequence remains largely preserved.
Disulfide bonds provide additional stabilization in some protein structures, so their disruption can contribute to a greater loss of the native three-dimensional arrangement. Their importance varies among proteins because not every protein depends on these bonds to the same extent. Considering them separately from noncovalent interactions helps explain why proteins can respond differently to the same environmental stress.
Exposed hydrophobic regions can make unfolded proteins associate, promoting aggregation. This shifts the protein population from individually folded or unfolded molecules toward clustered material and may make recovery of the original functional shape more difficult. The tendency matters because aggregation links structural instability to loss of activity and helps explain why unfavorable conditions can produce persistent rather than readily reversible effects.
Unfolding primarily changes the protein’s three-dimensional organization while leaving its amino acid sequence largely intact. Sequence damage would represent a different type of molecular change, whereas unfolding concerns the arrangement maintained by stabilizing interactions. This distinction is important when interpreting loss of function, because a protein may become inactive through structural disruption even without substantial alteration of its underlying sequence.
Biologists can compare protein behavior under heat, extreme pH, chemical denaturants, or solvent changes, then relate those conditions to alterations in shape and biological activity. Observing whether hydrophobic regions become exposed, aggregation develops, or function is impaired connects the environmental treatment with its structural outcome. This approach is useful for examining enzymes and other functional proteins under controlled changes in conditions.
The process provides a framework for connecting environmental or chemical stress with structural instability, aggregation, and impaired protein function. Those outcomes are central to understanding how improperly folded proteins can affect biological systems and contribute to disease-related research. Examining these links also helps distinguish an initial loss of structure from later consequences, such as persistent aggregation or reduced activity.
Some proteins can refold when favorable conditions return, showing that unfolding does not always permanently destroy the information needed for the native structure. Recovery depends on whether the protein avoids extensive aggregation and whether the conditions again support stabilizing interactions. Comparing proteins that recover with those that remain aggregated can reveal how reversibility influences biological activity after environmental stress.