N-phenylglycine CAS 103-01-5

The initial attachment of biofilm is the crucial first step in biofilm formation. N-phenylglycine can inhibit the initial attachment of microbial cells to object surfaces in various ways. N-phenylglycine can interact with certain components on the surface of microbial cells, altering the charge distribution and hydrophobicity of the cell surface, thereby reducing the affinity between the cell and the surface of the object, and reducing the occurrence of reversible and irreversible adhesion. For example, research has found that N-phenylglycine can bind to lipopolysaccharides on the surface of bacterial cells, altering the surface charge properties and making it difficult for bacterial cells to adhere to solid surfaces. The adhesion molecules on the surface of microbial cells play an important role in the initial adhesion process. N-phenylglycine can regulate the expression of related genes in microbial cells, inhibit the synthesis and secretion of adhesion molecules. Through real-time quantitative PCR and Western blot analysis, it was found that bacteria treated with N-phenylglycine showed a significant decrease in the expression levels of adhesion molecules such as pili and cilia, thereby reducing their ability to attach to surfaces.

Quorum sensing is a mechanism through which microbial cells secrete and perceive signaling molecules to exchange information and coordinate group behavior, playing a key role in the formation, development, and maturation of biofilms. N-phenylglycine can interfere with the microbial quorum sensing system, thereby inhibiting the formation of biofilms. Many microorganisms initiate quorum sensing by synthesizing specific signaling molecules, such as acyl homoserine lactones (AHLs), self inducing peptides (AIPs), etc. N-phenylglycine can inhibit the activity of enzymes related to signal molecule synthesis or regulate the expression of related genes, reducing the synthesis of signal molecules. There are receptor proteins for signaling molecules on the surface of microbial cells. When signaling molecules bind to receptor proteins, they activate downstream signaling pathways and regulate the expression of related genes. N-phenylglycine can compete with signaling molecules to bind to receptor proteins, or alter the conformation of receptor proteins to prevent them from sensing signaling molecules properly, thereby blocking the transduction of quorum sensing signals.

N-phenylglycine can exert its anti biofilm effect by disrupting the structure of already formed biofilms. EPS is an important component of biofilm structure, and N-phenylglycine can activate certain enzymes in microbial cells or biofilms, such as polysaccharide hydrolases, proteases, etc., to degrade polysaccharides, proteins, and other components in EPS, disrupting the stable structure of biofilms. For example, research has found that N-phenylglycine can induce Pseudomonas aeruginosa to secrete alginate lyase, which degrades the alginate components in the biofilm, making the structure of the biofilm loose and easy to remove. The hydration state of biofilm has a significant impact on its structure and function. N-phenylglycine can affect the distribution and fluidity of water in biofilms, altering their hydration state. Through techniques such as magnetic resonance imaging, it was observed that the internal moisture content and flowability of biofilms treated with N-phenylglycine changed, leading to structural damage and loss of function.

N-phenylglycine can affect the metabolic processes of microorganisms, thereby inhibiting the formation and development of biofilms. The energy metabolism of microorganisms is an important foundation for maintaining their growth and biofilm formation. N-phenylglycine can inhibit the activity of respiratory chain enzymes or key enzymes in the glycolysis pathway within microbial cells, interfering with microbial energy production. For example, in Escherichia coli, N-phenylglycine can inhibit the activity of cytochrome oxidase, reduce ATP synthesis, and deprive microbial cells of sufficient energy to maintain biofilm formation and stability. Microorganisms need to absorb nutrients from their surrounding environment to maintain growth and biofilm formation. N-phenylglycine can affect the expression and activity of nutrient transporters on microbial cell membranes, regulating microbial uptake of nutrients such as carbon, nitrogen, and phosphorus sources. Research has found that bacteria treated with N-phenylglycine have a reduced ability to uptake nutrients such as glucose and amino acids, which affects bacterial growth and biofilm formation.