Overview
Flavonol synthase (FLS) is a Fe²⁺/2-oxoglutarate-dependent dioxygenase that catalyzes the conversion of dihydroflavonols to flavonols in the flavonoid biosynthesis pathway. As a key enzyme in plants, it influences pigmentation, UV protection, and defense mechanisms. Industrially, recombinant FLS is used to produce flavonols like quercetin and kaempferol for pharmaceuticals and functional foods. First identified in Arabidopsis thaliana, FLS isoforms exhibit species-specific substrate preferences. Its engineered variants are increasingly applied in synthetic biology to enhance flavonoid yields in microbial systems, offering sustainable alternatives to plant extraction.
Physical and Chemical Properties
FLS typically functions as a monomeric protein with a molecular weight of 40-45 kDa, though some plant isoforms form dimers. It requires Fe²⁺, ascorbate, and molecular oxygen as cofactors, with optimal activity at pH 7.0-7.5 and 25-30°C. The enzyme’s stability varies by formulation; lyophilized powders retain activity for years at -20°C, while liquid solutions degrade faster. Kinetic studies show Km values of 5-20 µM for dihydroflavonol substrates. FLS is inhibited by metal chelators (e.g., EDTA) and oxidizing agents. Spectrophotometric assays (λ=370 nm) are standard for activity measurement, with one unit (U) defined as 1 µmol product/min under specified conditions.
Main Applications
In plant biotechnology, FLS overexpression is used to boost flavonol content in crops for improved nutritional value (e.g., antioxidant-rich tomatoes). Pharmaceutical manufacturers employ FLS to synthesize flavonol precursors for anti-inflammatory and cardioprotective drugs. Nutraceutical companies utilize microbial systems with FLS genes to produce standardized flavonol extracts. The enzyme also aids research on flavonoid metabolism and gene regulation. Recent advances include FLS fusion proteins for cascade reactions and immobilized forms for continuous bioprocessing, enhancing cost-efficiency in industrial applications.
Safety and Storage
FLS poses minimal toxicity (LD50 >2000 mg/kg orally) but may cause eye/skin irritation. Use nitrile gloves and goggles when handling. Spills should be neutralized with dilute sodium bicarbonate and rinsed with water. Store lyophilized enzymes in airtight containers with desiccants; solutions require cryoprotectants (e.g., glycerol) to prevent ice damage. Transport under cold chain conditions (dry ice or -20°C packs). Activity loss exceeding 10% after thawing indicates improper storage. Always verify certificates of analysis (CoA) for endotoxin levels (<1 EU/mg) in GMP-grade products.
B2B Procurement Guide
Specify activity (e.g., ≥50 U/mg), expression host (E. coli, P. pastoris), and purity (SDS-PAGE ≥90%) when ordering. Bulk buyers (>100 mg) can negotiate discounts of 15-30%. Key suppliers include Sigma-Aldrich, Cayman Chemical, and specialty biotech firms like BioVision. For GMP compliance, request DMF files and batch-specific CoAs. Lead times range from 2 weeks (stock items) to 8 weeks (custom expression). Consider pilot-scale testing for fermentation-derived FLS to assess scalability. Alternatives include cell-free systems or engineered whole-cell biocatalysts for cost-sensitive applications.
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