Overview
Brefeldin A is a macrocyclic lactone originally isolated from the fungus Penicillium brefeldianum. It has become a crucial tool in cell biology due to its potent inhibition of protein transport from the endoplasmic reticulum to the Golgi apparatus. The compound's ability to reversibly disrupt Golgi function makes it valuable for studying membrane trafficking pathways and organelle dynamics. First described in the 1960s as an antiviral agent, Brefeldin A gained prominence in the 1980s when its mechanism of action was elucidated. Today, it is predominantly used in research settings rather than therapeutic applications, with most commercial production targeting laboratory reagents rather than bulk pharmaceutical use.
Physical and Chemical Properties
As a fungal metabolite, Brefeldin A exhibits typical lactone characteristics including stability in organic solvents but sensitivity to prolonged exposure to aqueous solutions at non-optimal pH. The crystalline form remains stable when stored properly, though solutions in DMSO or ethanol should be prepared fresh for critical experiments. The compound's biological activity stems from its specific interaction with Arf-GTPase proteins, preventing guanine nucleotide exchange. This molecular mechanism underlies its effects on vesicle formation and protein secretion. Spectroscopic analysis shows maximum absorbance at 205 nm, a property sometimes used for concentration verification in laboratory preparations.
Main Applications
In research laboratories, Brefeldin A serves three primary functions: as a disruptor of protein secretion pathways, an inducer of unfolded protein response, and a tool for studying Golgi structure-function relationships. It is commonly used at concentrations ranging from 0.1-10 μg/mL depending on cell type and experimental duration. The pharmaceutical industry occasionally employs Brefeldin A in drug discovery programs targeting secretory pathways, particularly for diseases involving protein misfolding. However, its cytotoxicity limits therapeutic applications, with most usage confined to in vitro studies. Recent applications include investigating autophagy and ER stress responses in cancer research models.
Safety and Storage
As a biologically active compound, Brefeldin A requires careful handling. Laboratory personnel should use nitrile gloves and eye protection when working with powder forms, and procedures should be conducted in fume hoods when preparing stock solutions. The compound is not considered highly volatile but may form dust during handling. For long-term storage, aliquoting in amber vials under inert gas can extend stability. Aqueous solutions lose potency within hours at room temperature, while DMSO stock solutions remain stable for months at -20°C when protected from moisture. Contamination risks increase after multiple freeze-thaw cycles, making single-use aliquots preferable for critical applications.
B2B Procurement Guide
Research-grade Brefeldin A is typically sold in milligram quantities, with bulk purchases (gram scale) requiring special order from specialty chemical suppliers. Key procurement considerations include verification of NMR and HPLC purity data, endotoxin testing for cell culture applications, and supplier documentation of sterility when required. Leading manufacturers include Sigma-Aldrich, Cayman Chemical, and Tocris Bioscience, with pricing reflecting purity grades and analytical documentation. For GMP-grade material (rarely required), lead times may extend to several months. Secondary suppliers often provide cost advantages but may lack comprehensive characterization data, making supplier qualification essential for reproducible research outcomes.
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