Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025
Definition
Phospholipases are enzymes that hydrolyze phospholipids into fatty acids and other lipophilic substances. They play vital roles in cell membrane dynamics, signaling pathways, and pathogenic mechanisms of microbes.
Phospholipases are classified into four major types: A1, A2, C, and D based on their site of action on the phospholipid molecule.
Type A2 phospholipase (PLA2) is commonly associated with the virulence factors of pathogenic bacteria as it can disrupt host cell membranes.
Phospholipases are crucial for microbial catabolism of lipids, providing essential fatty acids for energy production and membrane biosynthesis.
In pathogens, phospholipases contribute to tissue invasion by breaking down host cell membranes and facilitating the spread of infection.
Phospholipase activity can trigger inflammatory responses in the host organism due to the release of arachidonic acid and subsequent eicosanoid production.
Related terms
Lipase: An enzyme that breaks down fats into glycerol and free fatty acids.
Virulence Factor: A characteristic or component that enables a pathogen to cause disease.
Arachidonic Acid: A polyunsaturated fatty acid released from membrane phospholipids by phospholipase action, serving as a precursor for inflammation-related eicosanoids.