Disulfide Bridge
Disulfide Bridge - Related Videos
03:51
Fluorescent Functionalization of Virus-Like Particles via Disulfide Re-bridging
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2026
Source: Chen, Z., et al. Making Conjugation-induced Fluorescent PEGylated Virus-like Particles by Dibromomaleimide-disulfide Chemistry. J. Vis. Exp. (2018)This video demonstrates the fluorescent functionalization of virus-like particles by re-bridging reduced disulfides with a polyethylene glycol (PEG) linker, producing stable, trackable conjugates suitable for cellular imaging and targeted delivery in biomedical applications.
10:18
Making Conjugation-induced Fluorescent PEGylated Virus-like Particles by Dibromomaleimide-disulfide Chemistry
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Cited by 12 •
2018
Here, we present a procedure to fluorescently functionalize the disulfides on Qβ VLP with dibromomaleimide. We describe Qβ expression and purification, the synthesis of dibromomaleimide-functionalized molecules, and the conjugation reaction between dibromomaleimide and Qβ. The resulting yellow fluorescent conjugated particle can be used as a fluorescence probe inside cells.
01:15
Design Example: Strain Gauge Bridge or Wheatstone Bridge
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2024
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
10:09
Application of Simplified Stent-bridging Pancreaticogastrostomy in Open Pancreaticoduodenectomy
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2026
Here, we present the stent-bridging pancreaticogastrostomy (PG) technique, which uses a stent to bridge the remnant pancreas to the stomach during open pancreaticoduodenectomy. The stent-bridging PG aims to simplify the anastomosis, achieve complete diversion of pancreatic juice, and minimize manipulation of the pancreatic remnant.
01:24
Bridge rectifier
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2025
The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability. Operationally, the bridge rectifier allows current flow through two of its diodes during each...
FAQs
Oxidation removes the relevant sulfhydryl hydrogen atoms from two cysteine residues, allowing their sulfur atoms to form an S–S linkage. This covalent connection joins separate parts of a protein chain or potentially different chains, changing the constraints on protein structure. The resulting linkage contributes to the protein’s stable three-dimensional arrangement.
Disulfide bridges respond to the balance between oxidizing and reducing conditions around a protein. Oxidizing conditions support formation of the S–S linkage, whereas reducing conditions can disrupt it and return the cysteine residues to sulfhydryl groups. Consequently, shifts in redox state can alter protein structure, folding behavior, and biological activity.
Formation alone does not fully determine the structural outcome; disulfide bridges can also rearrange as a protein folds. These changes help establish or modify the final three-dimensional structure, which can affect biological activity. Redox-sensitive rearrangement therefore links chemical conditions with folding progress and the functional state of the protein.
Extracellular and secreted proteins often depend strongly on these covalent linkages for structural stability. Disulfide bridges help maintain their three-dimensional conformations and increase resistance to unfolding outside the cell. Their contribution is therefore especially relevant when a protein must preserve its structure and activity in an extracellular or secreted setting.
Because reducing conditions can disrupt disulfide bridges, researchers can use redox sensitivity to examine whether a protein’s structure depends on these linkages. Comparing protein behavior under different redox conditions can help connect the presence or loss of S–S connections with changes in folding, stability, or biological activity during biochemical analysis.
In protein engineering, disulfide bridges are relevant because altering cysteine-based connections can influence structural stability, resistance to unfolding, and biological activity. In biology, their reversible sensitivity to the redox environment provides a mechanism for redox regulation. Together, these properties make the linkages useful for studying and modifying protein behavior.