Propionibacteriales

Propionibacteriales is an order of Gram-positive bacteria that includes several notable species. These bacteria are typically rod-shaped and are known for their ability to produce propionic acid as a byproduct of their metabolism.

Taxonomy

The order Propionibacteriales is part of the class Actinobacteria, a large and diverse group of bacteria that includes many important human pathogens. Within the order Propionibacteriales, there are two families: Propionibacteriaceae and Nocardioidaceae.

Characteristics

Propionibacteriales are anaerobic bacteria, meaning they can survive and grow in environments without oxygen. They are also non-motile, which means they do not move on their own and instead rely on external forces to move them.

These bacteria are known for their ability to produce propionic acid, a short-chain fatty acid that has numerous applications in the food and chemical industries. Propionic acid is also an important component of the human gut microbiota, where it plays a role in maintaining the health of the intestinal lining.

Notable Species

Several species within the order Propionibacteriales are of particular interest due to their roles in human health and disease. For example, Propionibacterium acnes is a common skin bacterium that is associated with acne. Propionibacterium freudenreichii is used in the production of Swiss cheese, where it contributes to the characteristic holes and flavor.

Role in Disease

While many species of Propionibacteriales are harmless or even beneficial, some can cause disease in humans. Propionibacterium acnes, for example, is associated with acne and other skin conditions. Other species, such as Propionibacterium propionicus, can cause more serious infections, particularly in people with weakened immune systems.

See Also

• Actinobacteria
• Propionic acid
• Anaerobic bacteria
• Gram-positive bacteria