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Catalog Number: 032005
Purity: >99%
Source: bovine
Molecular Weight: ~110 kDa
Form: clear aqueous solution
Concentration: 20 mg/ml
Buffer Conditions: 80 mM PIPES, 1 mM EGTA, 1 mM MgCl2Â (pH 6.8)
Shipping: shipped on dry ice
Storage Conditions: store at -80ËšC immediately
Shelf Life: check product label for expiration date
Taxol Stabilized Microtubules (long and flexible)
Taxol-stabilized microtubules at 5 mg/ml total tubulin protein with Labeled Tubulin-Alexa Fluor® 647 (Cat. No. 064705) and Cycled Tubulin™ (Cat. No. 032005) at a 1:5 ratio. Images acquired on a widefield fluorescence microscope. View protocol.
GMPCPP Stabilized Microtubules (short and rigid)
GMPCPP-stabilized microtubules at 2 mg/ml total tubulin protein with Labeled Tubulin-Alexa Fluor® 647 (Cat. No. 064705) and Cycled Tubulin™ (Cat. No. 032005) at a 1:5 ratio. Images acquired on a widefield fluorescence microscope. View protocol.
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 tubulin protein is >99% pure (Figure 1) and polymerization competent (Figure 2). Cycled Tubulin™ is cryopreserved at 20 mg/ml in 1X Tubulin PEM Buffer (also known as BRB80; 80 mM PIPES, 1 mM EGTA, and 1 mM MgCl2, pH 6.8).
Cycled Tubulin™ is >99% pure. Coomassie G250-stained protein gel of Cycled Tubulin™ separated by SDS-PAGE. The tubulin protein appears as a single species migrating at ~55 kDa. Molecular weight markers and loaded protein quantities are indicated.
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 1X Tubulin PEM Buffer (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.
For general, purchasing, or technical questions, email [email protected].
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