Cellular amino groups on proteins and nucleic acids

Cellular amino groups on proteins and nucleic acids represent a broad class of nucleophilic targets essential for biological structure and function. In proteins, these groups are primarily found on the side chains of lysine residues and at the N-terminus, where they participate in catalytic mechanisms and post-translational modifications (Source: UniProt). In nucleic acids, exocyclic amino groups on adenine, cytosine, and guanine are vital for the hydrogen bonding that stabilizes the DNA double helix (Source: PubMed, PMID: 15171554). These groups are the primary sites of attack for alkylating agents, such as nitrogen mustards and busulfan, which form covalent bonds that disrupt DNA replication and trigger apoptosis in rapidly dividing cells (Source: StatPearls, Alkylating Agents). Additionally, these groups are targeted by chemical sterilants like glutaraldehyde, which cross-links proteins to inactivate pathogens (Source: CDC). While effective in treating various cancers, the ubiquitous nature of these amino groups leads to significant off-target effects, including bone marrow suppression and an increased risk of secondary leukemias (Source: American Cancer Society).

Other names

Primary aminesNucleophilic amino groupsLysine epsilon-amino groupsExocyclic amino groups of nucleobasesN-terminal amines

Covalent alkylation and cross-linking of nucleophilic amino groups on DNA and proteins, leading to the inhibition of replication, transcription, and enzymatic function.