Overview
Demethyltransferases are a class of enzymes responsible for removing methyl groups (-CH3) from DNA, RNA, or proteins, primarily regulating gene expression epigenetically. They counterbalance methyltransferases to maintain dynamic methylation states critical for cellular differentiation, genomic imprinting, and X-chromosome inactivation. These enzymes are categorized by substrate specificity: DNA demethylases (e.g., TET enzymes), histone demethylases (e.g., LSD1, JMJD family), and RNA demethylases (e.g., FTO, ALKBH5). Their discovery revolutionized understanding of epigenetic plasticity, with implications for cancer, neurological disorders, and regenerative medicine.
Physical and Chemical Properties
As protein complexes, demethyltransferases exhibit tertiary/quaternary structures with catalytic domains (e.g., Jumonji domains for Fe²⁺/α-KG-dependent enzymes). Most require cofactors like iron (Fe²⁺), alpha-ketoglutarate (α-KG), or flavin adenine dinucleotide (FAD). Activity is pH-dependent (optimal 7.0-7.5) and temperature-sensitive (active at 25-37°C). Stability varies: some are sensitive to oxidation (e.g., TET enzymes require antioxidants like ascorbate), while others tolerate mild reducing agents. Common buffers contain glycerol (10-20%) and DTT (1-5 mM) to prevent aggregation and maintain redox states. Purity is assessed via SDS-PAGE (≥80-90% for research-grade).
Main Applications
In research, demethyltransferases are tools to study epigenetic reprogramming (e.g., iPSC generation) and disease mechanisms (e.g., aberrant methylation in tumors). TET enzymes are targeted for leukemia research, while LSD1 inhibitors are explored for prostate cancer therapy. Industrially, recombinant demethylases are used in diagnostic kits to analyze methylation patterns. Biotechnology applications include editing methylomes ex vivo for cell therapies. Emerging uses involve agricultural epigenetics to modulate crop traits via methylation control.
Safety and Storage
While non-hazardous, demethyltransferases require cold chain management (-80°C for long-term storage; dry ice shipping). Lyophilized forms are stable at -20°C for 1-2 years if desiccated. Avoid freeze-thaw cycles; aliquot working solutions. Activity loss occurs via proteolysis (add protease inhibitors) or cofactor depletion (supply Fe²⁺/α-KG for assays). Contamination risks are low, but aseptic handling is advised for cell culture applications. Dispose of waste following biochemical waste protocols.
B2B Procurement Guide
Key specifications include: activity units (e.g., pmol/hr/µg), host system (E. coli, insect, or mammalian cells affecting post-translational modifications), and endotoxin levels (<1 EU/µg for cell work). Bulk buyers should request batch consistency reports and validation data (e.g., demethylation assays via bisulfite sequencing). Custom services (e.g., mutant variants, tagged enzymes) are available from specialized suppliers like Sigma-Aldrich, Abcam, or CST. MOQs typically start at 100 units for discounted pricing.
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