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Related Concept Videos

Leaving Groups02:14

Leaving Groups

The nature of leaving groups strongly influences the outcome of a nucleophilic substitution reaction.
In general, in a nucleophilic substitution reaction, a nucleophile displaces a functional group, called the leaving group, from the substrate to give a substituted product. A leaving group departs the substrate molecule through heterolytic cleavage, taking the pair of electrons with it to become a relatively stable weak base in the form of an anion or a neutral molecule.  
In a nucleophilic...
Enzymes and Activation Energy01:13

Enzymes and Activation Energy

The activation energy (or free energy of activation), abbreviated as Ea, is the small amount of energy input necessary for all chemical reactions to occur. During chemical reactions, certain chemical bonds break, and new ones form. For example, when a glucose molecule breaks down, bonds between the molecule's carbon atoms break. Since these are energy-storing bonds, they release energy when broken. However, the molecule must be somewhat contorted to get into a state that allows the bonds to...
Enzymes and Activation Energy01:13

Enzymes and Activation Energy

The activation energy (or free energy of activation), abbreviated as Ea, is the small amount of energy input necessary for all chemical reactions to occur. During chemical reactions, certain chemical bonds break, and new ones form. For example, when a glucose molecule breaks down, bonds between the molecule's carbon atoms break. Since these are energy-storing bonds, they release energy when broken. However, the molecule must be somewhat contorted to get into a state that allows the bonds to...
Enzymes02:34

Enzymes

Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
Allosteric Regulation01:08

Allosteric Regulation

Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...

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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

Enzyme-specific activation versus leaving group ability.

Roseri J A C de Beer1, Berry Bögels, Gijs Schaftenaar

  • 1Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.

Chembiochem : a European Journal of Chemical Biology
|July 24, 2012
PubMed
Summary

Leaving group ability is crucial for protease-catalyzed peptide synthesis, alongside enzyme activation and substrate mimetics. This study highlights its importance, challenging previous assumptions about guanidinophenyl ester function.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Organic Chemistry

Background:

  • Protease-catalyzed peptide synthesis often faces challenges with limited substrate recognition.
  • The guanidinophenyl (OGp) ester is a key component in enzyme-specific activation and substrate mimetic strategies.
  • The role of OGp esters has been primarily attributed to enzyme affinity and recognition.

Purpose of the Study:

  • To investigate the importance of leaving group ability in protease-catalyzed peptide synthesis.
  • To challenge the prevailing explanation for the efficacy of guanidinophenyl esters.
  • To explore alternative factors influencing enzyme-substrate interactions.

Main Methods:

  • Synthesis and evaluation of OGp ester analogues in a dipeptide synthesis assay using trypsin.
  • Molecular docking studies to elucidate enzyme-binding modes.
  • Ab initio calculations to assess the electronic properties of the esters.

Main Results:

  • Leaving group ability was found to be as important, if not more so, than previously assumed interactions for OGp esters.
  • Experimental and computational data provided insights into the binding and electronic properties of the ester analogues.
  • The study demonstrated that enhanced leaving group ability can significantly impact protease-catalyzed reactions.

Conclusions:

  • Leaving group ability is a critical, and often underestimated, factor in protease-catalyzed peptide synthesis.
  • The efficacy of OGp esters is influenced by both enzyme recognition and inherent leaving group properties.
  • This research refines our understanding of enzyme-specific activation and substrate mimetic strategies in peptide synthesis.