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¦Ù°Ê³J¥ÕÆ[¹î -- °µ§ÀôÊy(Phalloidin)¬V¦â
¥Øªº | Understand the following: 1. Roles of actin in cell structure, cytokinesis, cytoplasmic streaming, amoeboid movement and cell motility 2. Effects of phalloidin on actin polymerization and depolymerization 3. Detection of F-actin by fluorescently by viscosity |
ì²z | Actin is a ubiquitous protein on the cytoplasm of eukaryotic cells. It is often the most common protein, comprising up to 10% of the total protein of the cell. There are at least six different actins known, four alpha-actins which are found in various muscle cells, and one beta-actin and one gamma-actin found in all cells. Actins are approximately 400amino acids long (MW 42000) and can exist in two forms, as a monomer (G actin or globular actin) and as a long helical filament (F actin or filamentous actin). Actin filaments are the microfilaments of the eukaryotic cell, which are involved in cellular structures, cytokinesis, cytoplasmic streaming, amoeboid movement, and cell motility. There are a number of actin-binding proteins in eukaryotic cells which influence microfilament structure or control actin polymerization.Phalloidin is a cyclic peptide that comes from Amanita phalloides, a highly poisonous mushroom. Phalloidin, like cytochalasin, blocks cell movements that require the turnover of microfilaments. Phalloidin binds to actin units in microfilaments and prevents their depolymerization. Thus, microfilaments are in effect locked by phalloiding |
§÷®Æ | Cell cultured on coverslips |
³]³Æ | Fluorescent microscope |
ÃÄ«~ | *PFA 2%in PBS, containing 5% cytoskeletal extraction
buffer *cytoskeletal extraction buf.:0.5%Triton-X, 50mM NaCl, 300mM sucrose, 3mM MgCl2, 20£ggmaprotinin, 1£gg/ml leueptin, 1£gg/ml pepstatin, 1mMPMSF, 10mM Pipes pH8.8 *Dilution buffer:0.1% BSA, 0.05%Tween in PBS *Blocking buffer: 10%BSA in PBS or skim milk powdered 5% in PBS *Mounting media: antifade (Molecular Probes) |
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1. Fixation: 2. Single Staining FITC Phalloidin(green) 3. coverslip and mount 4.Observation under fluroscent microscope |
®É¶¡ | About 1.5hrs, O/N |
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