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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...

Enzyme Kinetics

Enzyme Kinetics

Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...

Enzyme-linked Receptors

Enzyme-linked Receptors

Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...

Therapeutic Index

Therapeutic Index

The therapeutic index of a drug is a key parameter in pharmacology that quantifies the relative safety of a drug by calculating the ratio between the dose that causes toxicity in half the population (50%) to the dose that proves to be effective for half the population (50%). It provides a spectrum of doses for a particular drug ranging from effective to potentially toxic. To illustrate, consider an anticoagulant agent like warfarin. It possesses a narrow window within its therapeutic index to...

Enzyme Inhibition

Enzyme Inhibition

Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.

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...

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Related Experiment Video

Updated: Feb 8, 2026

Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System

Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System

Published on: August 8, 2016

Hyaluronidases: A Therapeutic Enzyme.

Naqab Khan¹, Zahid Rasul Niazi¹, Fazu Ur Rehman²

¹Department of Basic Medical Sciences, Faculty of Pharmacy, Gomal University, Dera Ismail Khan, KPK, Pakistan.

Protein and Peptide Letters

|June 30, 2018

Summary

Hyaluronidase enzymes, found in animal venoms, degrade hyaluronic acid and have diverse therapeutic applications. This review summarizes their physiological and clinical significance.

Keywords:

Arthropods venom Caterpillar PAGE separation hyaluronidase medicinal and biochemical applications therapeutic enzyme.

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Area of Science:

Biochemistry
Enzymology
Toxicology

Background:

Hyaluronidase is a key enzyme in the interstitial matrix, degrading hyaluronic acid.
Found in venoms of snakes, scorpions, and spiders, five venom hyaluronidases have known 3D structures.
These enzymes play roles in various physiological and pathological processes, including inflammation, wound healing, and disease progression.

Purpose of the Study:

To review the physiological significance of hyaluronidase enzymes.
To summarize the adjuvant and therapeutic applications of hyaluronidase from various animal sources.

Main Methods:

Literature review of scientific articles on hyaluronidase.
Analysis of the biochemical and physiological roles of hyaluronidase.
Compilation of therapeutic and clinical applications of hyaluronidase.

Main Results:

Hyaluronidases are involved in embryogenesis, drug/toxin diffusion, and immune responses.
They are crucial in wound healing and the spread of infections like meningitis and bacteremia.
Five venom hyaluronidases with defined structures have been identified.

Conclusions:

Hyaluronidase enzymes exhibit significant physiological roles.
These enzymes possess broad therapeutic potential, including adjuvant cancer therapy, drug delivery enhancement, and cosmetic applications.
The review consolidates the multifaceted importance of animal-derived hyaluronidases.