Overview
Phalloidin is a bicyclic heptapeptide toxin originally isolated from the death cap mushroom (Amanita phalloides). It has become an essential tool in cell biology research due to its specific and irreversible binding to F-actin filaments. The compound's ability to stabilize actin filaments makes it valuable for fluorescent labeling in microscopy studies. Modern derivatives of phalloidin, including fluorescent conjugates (such as those labeled with Alexa Fluor, FITC, or TRITC), have expanded its applications in live-cell imaging and cytoskeleton research. These labeled versions maintain the toxin's high binding affinity while adding visualization capabilities.
Physical and Chemical Properties
Phalloidin is a stable compound with a molecular weight of 788.87 g/mol and the chemical formula C35H48N8O11S. It appears as a white to off-white powder that is soluble in polar organic solvents like methanol and DMSO, as well as in aqueous solutions. The compound's bicyclic structure contributes to its remarkable stability and binding specificity. The toxin's most notable chemical property is its irreversible binding to F-actin at a 1:1 stoichiometry. This interaction occurs at the interface between actin subunits in the filament, preventing depolymerization. The binding is so tight that it effectively 'locks' actin filaments in place, making phalloidin an invaluable tool for cytoskeleton studies.
Main Applications
In biological research, phalloidin serves primarily as a specific marker for actin filaments in fluorescence microscopy. Researchers commonly use fluorescent conjugates of phalloidin to visualize the cytoskeleton in fixed cells and tissues. These applications are crucial for studying cell morphology, migration, and structural organization. Beyond microscopy, phalloidin finds use in biochemical assays investigating actin dynamics. It helps quantify filamentous actin content and serves as a control in experiments studying actin polymerization/depolymerization. Some specialized applications include studying the effects of cytoskeletal drugs and investigating actin's role in cellular processes like endocytosis and cytokinesis.
Safety and Storage
Phalloidin is classified as extremely toxic (LD50 in mice is approximately 2 mg/kg when administered intraperitoneally). Proper handling requires gloves, eye protection, and working in a fume hood. Any spills should be contained immediately using absorbent materials and cleaned with appropriate solvents. For storage, phalloidin should be kept at -20°C in tightly sealed containers protected from light. Solutions should be prepared fresh when possible, though some fluorescent conjugates may remain stable for several weeks when stored properly. Always follow institutional guidelines for disposal of phalloidin and its derivatives as hazardous waste.
B2B Procurement Guide
When procuring phalloidin for research purposes, consider the specific application requirements. Fluorescent conjugates are available with various excitation/emission profiles to match microscope filter sets. Purity is critical, with research-grade products typically being >95% pure. Suppliers usually provide phalloidin in small quantities (microgram to milligram scales) due to its high potency and toxicity. Lead times may be longer than for standard chemicals due to special handling requirements. Ensure proper import/export documentation is in place, as some jurisdictions regulate phalloidin as a controlled substance. Bulk purchases for core facilities may qualify for volume discounts.
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