Overview
Estrogen synthase, scientifically termed aromatase (CYP19A1), is the enzyme responsible for the final step in estrogen biosynthesis. It converts androgens like testosterone and androstenedione into estrogens through aromatization. This cytochrome P450 enzyme is expressed in gonads, brain, adipose tissue, and placenta. As a key regulator of estrogen levels, it plays critical roles in sexual development, bone metabolism, and cardiovascular health. Pharmaceutical inhibition of aromatase is a major therapeutic strategy for estrogen-dependent cancers, particularly breast cancer in postmenopausal women.
Physical and Chemical Properties
Aromatase is a membrane-bound protein localized to the endoplasmic reticulum, with a molecular weight of approximately 58 kDa. The enzyme requires molecular oxygen and NADPH as cofactors for its catalytic activity. Commercial preparations typically show specific activities ranging from 0.1-5.0 nmol/min/mg protein. The enzyme's active site contains a heme group that facilitates the three-step conversion process: hydroxylation, dehydration, and aromatization. Its pH optimum ranges between 7.4-7.8 in physiological conditions. Recombinant human aromatase expressed in insect or mammalian cell systems maintains higher stability than native forms.
Main Applications
In clinical medicine, aromatase inhibitors (AIs) like letrozole and anastrozole are frontline treatments for hormone receptor-positive breast cancer, reducing estrogen production by 95-98%. Research-grade aromatase is essential for drug discovery screening and mechanistic studies of endocrine disruptors. The enzyme also finds applications in fertility treatments and managing estrogen excess syndromes. Recent studies investigate its role in neurosteroidogenesis and potential implications for Alzheimer's disease. Agricultural uses include regulating reproduction in livestock through aromatase-modulating compounds.
Safety and Storage
As a biological material, aromatase preparations require careful handling. Use gloves and eye protection to prevent exposure. Powder forms may become airborne - handle in a fume hood. Store lyophilized enzyme at -20°C with desiccant; reconstituted solutions should be aliquoted to avoid repeated freeze-thaw cycles. Stability typically maintains for 6-12 months when properly stored. Activity loss occurs rapidly above 37°C or in repeated freeze-thaw conditions. Shipping should always be performed on dry ice for international orders to preserve enzymatic activity during transit.
B2B Procurement Guide
When sourcing estrogen synthase for research or production, verify the supplier's Certificate of Analysis for specific activity, purity (typically ≥90% by SDS-PAGE), and endotoxin levels (<1.0 EU/μg). Consider expression system (E. coli vs. mammalian) based on required post-translational modifications. Bulk quantities (100mg+) often require 4-8 weeks lead time for custom production. Request stability data and validation protocols for GMP-grade material. Compare price per activity unit rather than mass alone. Reliable suppliers include Sigma-Aldrich, Cayman Chemical, and R&D Systems, with regional distributors often providing better logistical support.
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