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Tubulin (HiLyte 647TM dye labeled; porcine, micro-injctn)

货号 TL670M-A 售价(元) 5271
规格 5 x 20 µg CAS号
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HiLyte Fluor™ 647labeled microtubules formed from HiLyte Fluor™ 647 labeled tubulin.

                                                                                                                                                                                                                                                                                           

Product Uses Include:

Laser based applications

Monitoring microtubule dynamcs in living cells

Speckle microscopy

Formation of fluorescent microtubules

Microscopy studies of MAP and microtubule associated motor activities

Nanotechnology

Material:

Porcine brain tubulin (>99% pure, see Cat. # T240) has been modified to contain covalently linked HiLyte Fluor™ 647 (HiLyte Fluor is a trademark of Anaspec Inc, CA) at random surface lysines. An activated ester of HiLyte Fluor™ 647 was used to label the protein. Labeling stoichiometry was determined by spectroscopic measurement of protein and dye concentrations (dye extinction coefficient when protein bound is 250,000M-1cm-1). Final labeling stoichiometry is 0.2 to 0.7 dyes per tubulin heterodimer. HiLyte Fluor™ 647 labeled tubulin can be detected using a filter set of 600-630 nm excitation and 660-680 emission. HiLyte Fluor™ 647 tubulin is in a versatile, stable and easily shipped format. It is ready for micro-injection or in vitro polymerization. Cytoskeleton, Inc. also offers AMCA (Cat. # TL440M), HiLyte Fluor™ 488 (Cat. # TL488M), rhodamine (Cat. # TL590M), X-rhodamine (Cat. # TL620M) labeled tubulins.

Purity:
      The protein purity of the tubulin used for labeling is determined by scanning densitometry of Coomassie Blue stained protein on a 4-20% polyacrylamide gel. The protein used for TL670M is >99% pure tubulin (Figure 1 A). Labeled protein is run on an SDS gel and photographed under UV light. Any unincorporated HiLyte Fluor™ 670 dye would be visible in the dye front. No fluorescence is detected in the dye front, indicating that no free dye is present in the final product (Figure 1 B).

 

Figure 1: HiLyte Fluor™ 647 tubulin protein purity determination. A 50 µg sample of unlabeled tubulin protein was separated by electrophoresis in a 4-20% SDS-PAGE system and stained with Coomassie Blue (A). Protein quantitation was performed using the Precision Red Protein Assay Reagent (Cat. # ADV02). 20 µg of the same protein sample was run in a 4-20% SDS-PAGE system and photographed directly under 525-625nm illumination (B).

Biological Activity:
      The biological activity of HiLyte Fluor™ 647 tubulin is assessed by a tubulin polymerization assay. To pass quality control, a 5 mg/ml solution of HiLyte Fluor™ 647 labeled tubulin in G-PEM plus 5% glycerol must polymerize to >85%. This is comparable to unlabeled tubulin under identical conditions.