We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.
Health

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

What Is an Antimicrobial Peptide?

By H. Colledge
Updated: May 17, 2024
Views: 7,347
References
Share

An antimicrobial peptide, or host defense peptide, is part of the innate immune system present from birth to protect the body from infection. Structurally, it is a small molecule consisting of a chain of amino acids, the units from which proteins are made. There are a number of different types of antimicrobial peptide and they are found in all living creatures, where they act against microbes such as bacteria and viruses. As more microorganisms become resistant to antibiotics, it is thought that the use of antimicrobial peptides could provide alternative forms of treatment. Potentially, custom peptides could be made to treat infections, increase the immune response and neutralize the toxins produced by microbes.

The antimicrobial peptide molecule consists of a chain of amino acids, varying from six to 100 units in length. Over 800 different kinds of antimicrobial peptides have been recognized. They have been divided into four main classes according to their overall shape. These classes are known as α-helical, β-sheet, extended and loop peptides. The most common human peptide types are the histatins, which are found in saliva, and the defensins and cathelicidins, which are produced by immune system cells.

In most cases, an antimicrobial peptide attacks a microorganism by changing its cell membrane. Holes are created in the membrane that allow important substances such as nutrients to flow out of the cell. Although the details are not fully understood, there are thought to be a number of different membrane-changing mechanisms used by different types of peptides.

Research involving synthetic versions of histatins has shown that they can act against the yeast known as Candida albicans. This suggests that artificial histatins could be used to treat the yeast infection known as candidiasis that affects the mouths of HIV patients. Other research has suggested that histatins could be effective in treating some bacterial infections that occur in burns and skin wounds.

Thousands of different kinds of antimicrobial peptide could be manufactured to treat a variety of infections, but so far relatively few have been developed and trialled. One problem has been that, in clinical trials involving patients, antimicrobial peptides often appear less effective than they seem to be when tested in the laboratory. Another drawback is that synthetic antimicrobial peptides are expensive to produce. Advantages of developing antimicrobial peptides as drugs include that they are not harmful to human cells and they are not associated with resistance developing in the way that antibiotics are.

Share
WiseGeek is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Link to Sources

Editors' Picks

Discussion Comments
Share
https://www.wisegeek.net/what-is-an-antimicrobial-peptide.htm
Copy this link
WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.

WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.