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Related Concept Videos

Multi-Step Reactions02:31

Multi-Step Reactions

Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
Consecutive Reactions01:22

Consecutive Reactions

Consecutive reactions involve a sequence where the product of a preceding reaction becomes the reactant for the subsequent one. In a simple scheme, A transforms into B, which further reacts to form C, with rate constants k1 and k2, respectively. This concept is evident in the radioactive decay series. Assuming an initial state with only A present, the conservation of matter leads to three coupled differential equations, determining the concentrations of A, B, and C over time.The rate of change...
Coupled Reactions01:17

Coupled Reactions

Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
Energy in adenosine triphosphate or ATP molecules is easily accessible to do work. ATP powers the majority of energy-requiring cellular reactions. Cells...
Reaction Mechanisms03:06

Reaction Mechanisms

Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
Determining Order of Reaction02:53

Determining Order of Reaction

Rate laws describe the relationship between the rate of a chemical reaction and the concentration of its reactants. In a rate law, the rate constant k and the reaction orders are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed. A common experimental approach to the determination of rate laws is the method of initial rates. This method involves measuring reaction rates for multiple experimental trials carried out using...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...

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Rapid in-silico Battery Electrolyte Electrochemical Reaction Generation using 3T-VASP Multi-Scale Energy Minimization
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Enzymatic reaction sequences as coupled multiple traces on a multidimensional landscape.

Liskin Swint-Kruse1, Harvey F Fisher

  • 1Department of Biochemistry and Molecular Biology, The University of Kansas Medical Center, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.

Trends in Biochemical Sciences
|February 12, 2008
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Summary

Enzyme reactions are best modeled using a 3D potential energy surface, accounting for enzyme shapes and reaction steps. This model explains complex behaviors like multiple pathways and condition-dependent changes.

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Area of Science:

  • Biochemistry
  • Chemical Kinetics
  • Enzyme Catalysis

Background:

  • Current enzyme mechanisms struggle to explain all experimental observations.
  • A need exists for a more comprehensive model of enzyme-catalyzed reactions.

Purpose of the Study:

  • To propose a novel framework for describing enzyme-catalyzed reactions.
  • To introduce a three-dimensional potential energy surface model for enzyme mechanisms.

Main Methods:

  • Defining a 3D potential energy surface based on enzyme conformers, reaction steps, and Gibbs free energy.
  • Analyzing the implications of this surface for reaction pathways and kinetics.

Main Results:

  • The proposed surface accommodates complex experimental data.
  • It enables multiple intersecting reaction pathways, pathway funneling, and energy transduction.
  • It allows for kinetic coupling between alternative reaction pathways.

Conclusions:

  • The 3D potential energy surface model provides a flexible and comprehensive description of enzyme catalysis.
  • This model explains how enzymes adapt to varying conditions and exhibit condition-dependent behavior.