Left, GMPCPP-stabilized microtubules at 2 mg/ml [tubulin] with Labeled Tubulin-Alexa Fluor® 647 (Cat. No. 064705) and Cycled Tubulin™ (Cat. No. 032005) at a 1:10 ratio. Right, taxol-stabilized microtubules at 5 mg/ml [tubulin] with Labeled Tubulin-Alexa Fluor® 647 (Cat. No. 064705) and Cycled Tubulin™ (Cat. No. 032005) at a 1:10 ratio. Images acquired on a widefield fluorescence microscope.
CYCLED TUBULIN™ (>99%)
Catalog Number: 032005
Source: Bovine Brain
Material Cycled Tubulin™ is isolated by cycling bovine brain homogenate through conditions that promote tubulin polymerization/depolymerization in high salt buffers by an adaptation of the method of Castoldi and Popov (2003). The resulting product is >99% pure (Figure 1) and polymerization competent (Figure 2). Cycled Tubulin™ is cryopreserved at 20 mg/ml in Tubulin PEM Buffer (Cat. No. 032002; 80 mM PIPES, 1 mM EGTA, and 1 mM MgCl2, pH 6.8).
Activity and Applications Cycled Tubulin will polymerize into microtubules when supplemented with GTP, warmed to 37˚C, and kept above its critical concentration. Cycled Tubulin is suitable for use in a variety of cell-free experimental applications, and can be combined with fluorescent or biotinylated tubulin proteins in generating microtubules in vitro. Visit our protocols page for common microtubule polymerization protocols, including the generation of short, rigid microtubules stabilized by GMPCPP or long, flexible microtubules stabilized by taxol.
- structural analysis by X-ray crystallography and electron microscopy
- drug discovery by high-throughput screening
- in vitro biochemical and biophysical approaches
THE MOST ACTIVE AND SOLUBLE TUBULIN PROTEIN ON THE MARKET
Figure 2: Cycled Tubulin™ is polymerization-competent. Optical density (340 nm) of Cycled Tubulin™ that has undergone 1 (blue) or 2 (green) freeze/thaw cycles at 5 mg/ml in Tubulin PEM Buffer (Cat. No. 032002; 80 mM PIPES, 1 mM EGTA, and 1 mM MgCl2, pH 6.8) supplemented with 1 mM GTP and 20% glycerol and incubated at 37°C. Distinct nucleation and polymerization phases are evident.