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Related Concept Videos

Urea Cycle01:23

Urea Cycle

The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels.
Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.
Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction01:26

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Aldehydes and Ketones with Amines: Enamine Formation Mechanism01:14

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

Enamine formation involves the addition of carbonyl compounds to a secondary amine through a series of reactions. The mechanism begins with the generation of carbinolamine, a nucleophilic attack followed by several proton transfer reactions. The hydroxyl group of the carbinolamine is converted into water to make a better leaving group that can push the reaction forward by eliminating a water molecule. In enamine formation, the last step involves the abstraction of a proton from the α carbon to...
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...

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Related Experiment Video

Updated: May 12, 2026

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

Biosynthesis of the urease metallocenter.

Mark A Farrugia1, Lee Macomber, Robert P Hausinger

  • 1Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, USA.

The Journal of Biological Chemistry
|March 30, 2013
PubMed
Summary
This summary is machine-generated.

This study reviews the intricate assembly of nickel active sites in urease, a crucial enzyme. Accessory proteins like UreD/UreH, UreE, UreF, and UreG are essential for nickel insertion and enzyme activation.

Keywords:
BiosynthesisChaperone ChaperoninGTPaseMetalloenzymesNickelUrease

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Hot Biological Catalysis: Isothermal Titration Calorimetry to Characterize Enzymatic Reactions
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Hot Biological Catalysis: Isothermal Titration Calorimetry to Characterize Enzymatic Reactions

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Last Updated: May 12, 2026

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

Hot Biological Catalysis: Isothermal Titration Calorimetry to Characterize Enzymatic Reactions
13:00

Hot Biological Catalysis: Isothermal Titration Calorimetry to Characterize Enzymatic Reactions

Published on: April 4, 2014

Area of Science:

  • Biochemistry
  • Enzymology
  • Metalloprotein chemistry

Background:

  • Metalloenzymes require complex systems for assembling their active sites.
  • The dinuclear nickel enzyme urease serves as a model for studying metallocenter assembly.
  • Urease plays a significant role in medicine.

Purpose of the Study:

  • To review the current understanding of urease metallocenter assembly.
  • To elucidate the roles of accessory proteins in urease activation.
  • To present recent findings on the urease maturation process.

Main Methods:

  • Minireview of existing literature.
  • Analysis of accessory protein functions (UreD/UreH, UreE, UreF, UreG).
  • Discussion of GTP-dependent nickel insertion mechanisms.

Main Results:

  • Accessory proteins are critical for delivering nickel to the urease active site.
  • These proteins facilitate conformational changes and post-translational modifications.
  • The precise roles and interactions of each accessory protein are under active investigation.

Conclusions:

  • Urease activation is a complex, multi-protein-mediated process.
  • Understanding urease assembly provides insights into metalloenzyme function.
  • Ongoing research continues to refine the model of urease maturation.