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Microtubules (Taxol Stabilized and Lyophilized)

貨號 MT002-A 售價(元) 6406
規(guī)格 4 x 500 μg CAS號
  • 產(chǎn)品簡介
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Product uses:

Substrate for activation of kinesin ATPases (see Fig. 1)

Determination of IC50s for kinesin inhibitors

Used in Cytoskeleton, Inc’s kinesin ELIPA and End point ATPase assays (Cat. # BK060 & BK053)

Substrate for discovery and characterization of microtubule binding proteins (MAPs) (see Fig. 2)

Ideal for HTS applications (inquire for bulk rates)

Material:
       Stabilized microtubules (MTs) are supplied as a lyophilized powder. Microtubules have been prepared from porcine brain tubulin protein that is greater than 99% pure (Cat. # T240). These stringently quality controlled MTs provide highly reliable and reproducible results in assays that require MT substrates. The average MT length in this product is 2 μm. Using these pre-formed microtubules in assays depending on microtubules gives very reproducible results. In a microtubule activated kinesin ATPase assay (see Fig. 1), the CV between samples (Vmax) was less than 5% and the CV of Vmax between assays using different batches of MT001 was less than 8%.

Purity:
       The tubulin protein used to make pre-formed microtubules is >99% pure. See Cat. # T240.

Biological Activity:
       MTs serve as a substrate for kinesin motor proteins. Kinesin motor proteins orchestrate a wide range of kinetic events within a cell. They have been shown to move cargoes such as chromosomes and vesicles along MT tracks. Kinesins operate by utilizing the energy of ATP to hydrolysis, an activity that is greatly enhanced in the presence of MTs. An MT activated Enzyme Linked Inorganic Phosphate ATPase (ELIPA?) assay (Cat. # BK060) can therefore be used as a test for the biological activity of MT001 (Fig. 1). The motor protein used in this assay is Kinesin Heavy Chain motor domain (KHC: Cat. # KR01). MT001 is also an excellent substrate for detecting microtubule binding proteins, see Fig. 2. 

       Figure 1. MT activated kinesin ATPase reaction. Reactions were performed using the kinesin ELIPA assay Biochem? kit (Cat. # BK060). Reactions contained either MTs or KHC (Cat. # KR01) alone ("Reactions minus MTs or KHC") or the combination of MTs and KHC ("MTs and KHC reactions") . Triplicate reactions were measured in a spectrophotometer at 360 nm. Readings were taken once every 30 s for a total reaction time of 20 min. 

       Figure 2. Microtubule (MT) binding protein spin-down assay using MT002. >80% of MT002 (arrow: Tubulin) is in pellet (P) after spin-down. MAPs (Cat. # MAPF) bind to MTs and end up in pellet while BSA does not and stays in supernatant (S).

 

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