Related Experiment Video
Updated: Jan 5, 2026
09:46
Synthesis of Plant Phenol-derived Polymeric Dyes for Direct or Mordant-based Hair Dyeing
Published on: December 1, 2016
9.6K
Poly(2-oxazoline)s with a 2,2'-Iminodiacetate End Group Inhibit and Stabilize Laccase
Montasser Hijazi1, Esra Türkmen1, Joerg C Tiller1
1Department of Bio- and Chemical Engineering, TU Dortmund, Emil-Figge-Strasse 66, 44227, Dortmund, Germany.
Chembiochem : a European Journal of Chemical Biology
|October 16, 2019
Summary
Poly(2-oxazoline)s with iminodiacetate end groups act as potent, reversible inhibitors for laccase. These polymers enhance enzyme inhibition and stabilize laccase activity over extended periods.
Area of Science:
- Biochemistry
- Polymer Chemistry
- Enzyme Inhibition
Background:
- Laccase is a multi-copper oxidase with diverse applications.
- Developing effective and stable laccase inhibitors is crucial for controlling its activity.
Purpose of the Study:
- To investigate poly(2-oxazoline)s with iminodiacetate end groups as laccase inhibitors.
- To evaluate the impact of polymer chain attachment on inhibitor activity and enzyme stability.
Main Methods:
- Synthesis of poly(2-oxazoline)s with 2,2'-iminodiacetate end groups.
- Enzyme inhibition assays to determine IC50 values.
- Dynamic light scattering to study polymer aggregation.
- Laccase stability assays in the presence of inhibitors.
Main Results:
- Poly(2-oxazoline)s with iminodiacetate end groups are reversible, competitive inhibitors of laccase.
- Inhibitor activity increased over 30-fold compared to iminodiacetate alone.
- Specific aggregation of the most active inhibitor was observed above 5 mM.
- Polymer-inhibitors stabilized laccase, maintaining full activity for at least a month.
Conclusions:
- Polymer-bound iminodiacetate significantly enhances laccase inhibition.
- The observed aggregation phenomenon requires further investigation.
- Poly(2-oxazoline)-iminodiacetate conjugates offer a promising strategy for laccase stabilization and controlled inhibition.
Related Concept Videos
01:18Indirect-Acting Cholinergic Agonists: Mechanism of Action
2.5K
Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex,...
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex,...
2.5K
02:04Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
7.2K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
7.2K
02:57Sharpless Epoxidation
4.9K
The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
4.9K
01:29Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship
866
Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
866
02:24Acid-Catalyzed Ring-Opening of Epoxides
8.6K
Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
8.6K
01:57Preparation of Diols and Pinacol Rearrangement
4.0K
Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
4.0K