Accessible nucleophilic groups on microbial biomolecules

Accessible nucleophilic groups on microbial biomolecules represent a broad class of reactive chemical sites, including sulfhydryl (-SH), amino (-NH2), and hydroxyl (-OH) groups, found on various microbial components such as proteins, enzymes, and nucleic acids (McDonnell & Russell, 1999). These groups are essential for the microbe's survival, playing key roles in metabolic catalysis and structural integrity. Many antimicrobial agents, including biocides like glutaraldehyde and heavy metals like silver, function as electrophiles that covalently bind to or oxidize these nucleophilic centers (StatPearls, 2023). This interaction leads to the cross-linking of proteins, inactivation of vital enzymes, and disruption of the microbial cell wall or genome, effectively neutralizing the pathogen. Because these nucleophilic groups are also present in human cells, drugs targeting them often lack high specificity, which typically restricts their use to topical applications or sterilization processes to avoid systemic toxicity (PubChem). Consequently, these groups are considered non-specific targets rather than precise therapeutic receptors, and their modification is a hallmark of broad-spectrum antiseptic action.

Other names

Microbial nucleophilic sitesNucleophilic groups on microbial proteinsReactive microbial moietiesNucleophilic centers

Electrophilic attack and covalent modification (alkylation, oxidation, or coordination) of nucleophilic groups such as thiols, amines, and hydroxyls, leading to the inactivation of essential microbial proteins and enzymes (McDonnell & Russell, 1999).