Microbial cell membrane components (iodine-reactive)

Microbial cell membrane components, specifically iodine-reactive moieties, are the primary targets for iodine-based antiseptics such as povidone-iodine (StatPearls, NBK500006). These targets include a diverse range of essential molecules, such as sulfhydryl-containing proteins, enzymes, and unsaturated fatty acids located within the microbial cell wall and plasma membrane (McDonnell & Russell, 1999). When elemental iodine is released, it rapidly penetrates the cell and reacts with these moieties through oxidation and iodination. This process leads to the denaturation of proteins and the disruption of membrane integrity, resulting in rapid cell death across bacteria, viruses, and fungi (Bigliardi et al., 2017). Because iodine targets multiple essential components simultaneously, it exhibits a broad spectrum of activity and a low risk of developing antimicrobial resistance. Clinically, these interactions are exploited for preoperative skin preparation and the treatment of infected wounds to reduce microbial load and prevent systemic infection.

Other names

Microbial cell wall componentsBacterial membrane proteinsUnsaturated fatty acids (microbial)Sulfhydryl-containing microbial proteinsIodine-sensitive microbial moieties

Iodine acts as a potent oxidizing agent that penetrates the cell wall of microorganisms to react with functional groups of proteins (specifically sulfhydryl, hydroxyl, and amino groups) and unsaturated fatty acids. This results in the iodination and oxidation of these essential components, leading to protein denaturation, enzyme inhibition, and loss of membrane integrity, which causes rapid microbial death (McDonnell & Russell, 1999; StatPearls, NBK500006).