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Enzymes

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...

Mechanical Protein Functions

Mechanical Protein Functions

Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.

Introduction to Enzymes

Introduction to Enzymes

The use of enzymes by humans dates to 7000 BCE. Humans first used enzymes to ferment sugars and produce alcohol without knowing that this was an enzyme-catalyzed reaction. Wilhelm Kuhne coined the term 'enzyme' in 1877 from the Greek words ‘en’ meaning ‘in’ or ‘within’ and ‘zyme’ meaning ‘yeast.’
Most enzymes are proteins that speed up biochemical reactions without being consumed. Enzymes contain one or more active sites that bind the substrates and convert them into products. Many enzymes also...

Introduction to Enzyme Kinetics

Introduction to Enzyme Kinetics

Enzyme kinetics studies the rates of biochemical reactions. Scientists monitor the reaction rates for a particular enzymatic reaction at various substrate concentrations. Additional trials with inhibitors or other molecules that affect the reaction rate may also be performed.
The experimenter can then plot the initial reaction rate or velocity (Vo) of a given trial against the substrate concentration ([S]) to obtain a graph of the reaction properties. For many enzymatic reactions involving a...

Determination of Michaelis Constant and Maximum Elimination Rate

Determination of Michaelis Constant and Maximum Elimination Rate

The Michaelis constant (KM) and the theoretical maximum process rate (Vmax) are vital parameters in the Michaelis-Menten equation, central to many biochemical reactions. They provide essential insights into enzyme kinetics and drug metabolism.
These parameters can be estimated by analyzing plasma concentration data post-drug administration. A notable example of this application is phenytoin, a drug with capacity-limited kinetics. It's recommended that phenytoin should be administered at two...

Bioreactor Controls-III

Bioreactor Controls-III

Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...

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Related Experiment Video

Updated: Jul 20, 2026

The Importance of Correct Protein Concentration for Kinetics and Affinity Determination in Structure-function Analysis

The Importance of Correct Protein Concentration for Kinetics and Affinity Determination in Structure-function Analysis

Published on: March 17, 2010

How enzymes work: analysis by modern rate theory and computer simulations.

Mireia Garcia-Viloca¹, Jiali Gao, Martin Karplus

¹Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455, USA.

Science (New York, N.Y.)

|January 13, 2004

Summary

Computer simulations reveal how enzymes accelerate reactions by lowering activation energy and altering transition state dynamics. These insights clarify enzyme mechanisms and challenge existing theories.

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Area of Science:

Biochemistry and computational chemistry
Enzyme kinetics and reaction mechanisms

Background:

Enzyme catalysis is crucial for biological processes.
Understanding enzyme mechanisms requires advanced theoretical frameworks.

Purpose of the Study:

To elucidate the molecular origins of enzyme catalysis.
To present a unified framework for analyzing catalytic contributions.
To quantify the roles of activation free energy and transmission coefficients.

Main Methods:

Application of advanced transition state theory.
Utilizing rigorous computer simulations.
Analyzing specific enzyme systems.

Main Results:

Identified and quantified contributions of activation free energy reduction.
Assessed the impact of transmission coefficient factors (recrossing, tunneling, nonequilibrium effects).
Demonstrated the framework's utility across different enzymes.

Conclusions:

Enzyme catalysis arises from both energetic and dynamic factors.
Computer simulations provide quantitative insights into enzyme mechanisms.
The presented framework offers a comprehensive view of enzyme action.