Demethylation

Demethylation is a chemical process involving the removal of a methyl group (CH₃) from a molecule. In biological systems, this reaction is catalyzed by various demethylase enzymes and plays critical roles in several contexts: - **Epigenetics:** DNA demethylation removes methyl groups from cytosine residues in DNA, particularly at CpG sites. This regulates gene expression without altering the underlying sequence and is essential for development, cell differentiation, and disease progression[1][6]. - Enzymes such as cytochrome P450s and alpha-ketoglutarate-dependent hydroxylases are involved in these reactions[3][5]. - Demethylation can be passive or active; active processes involve specific enzymatic mechanisms[6]. - Dysregulation of DNA demethylation has been implicated in diseases like cancer and neurological disorders[1]. - **Metabolism & Natural Product Biosynthesis:** Demethylation occurs during the biosynthesis of natural products (e.g., sterols, terpenoids), degradation of plant biomass (e.g., lignin processing), and other metabolic pathways[5]. Demethylation itself is not a single molecular target but rather a type of chemical transformation or biological process. The actual therapeutic targets are typically specific enzymes that catalyze demethylation reactions (such as TET proteins for DNA or LSD1 for histones). Therefore: "Demethylation" refers to a biochemical process rather than an individual molecule or receptor; it cannot be directly targeted by drugs except through its mediating enzymes. Because "demethylation" does not refer to one discrete protein/receptor/enzyme but instead describes a class of chemical reactions/processes across many molecular contexts, it should not be considered an individual therapeutic target. For structured data purposes—such as drug discovery databases—the correct approach would be to specify particular demethylase enzymes relevant to your context rather than using "demethylation" generically[3][7].

Removal of methyl groups from molecules (including DNA, proteins, and small molecules) by demethylase enzymes[3][5][1]