Comparison

Tubulin MAP-rich (porcine brain)

Item no. ML116-B
Manufacturer Cytoskeleton
Amount 5 x 1 mg
Quantity options 1 x 1 mg 5 x 1 mg 1 x 10 mg Large quantities
Category
Type Proteins
Specific against Pig (Porcine, Sus scrofa domesticus)
Purity Purity is determined by scanning densitometry of proteins on SDS-PAGE gels. Samples are approximately 70% tubulin and 30% MAPs.
Citations N.-J. Chiang et al. 2013. A novel synthetic microtubule inhibitor, MPT0B214 exhibits antitumor activity in human tumor cells through mitochondria-dependent intrinsic pathway. PLoS ONE. 8, e58953.
S. Rath et al. 2012. Anti-angiogenic effects of the tubulysin precursor pretubulysin and of simplified pretubulysin derivatives. Br. J. Pharmacol. 167, 1048-1061.
C.-C. Hsieh et al. 2010. Chamaecypanone C, a novel skeleton microtubule inhibitor, with anticancer activity by trigger caspase 8-Fas/FasL dependent apoptotic pathway in human cancer cells. Biochem. Pharmacol. 79, 1261-1271.

Shelanski M. L., et al. (1973). Proc. Natl. Acad. Sci. USA. 70, 765-768
ECLASS 10.1 32160409
ECLASS 11.0 32160409
UNSPSC 12352202
Alias MAP rich tubulin is used for binding assays and as a source of endogenous microtubules, tubulin, MAP rich tubulin, porcine MAP rich tubulin, porcine tubulin, MAP tubulin
Similar products tubulin, porcine tubulin, MAP rich tubulin is used for binding assays and as a source of endogenous microtubules, MAP rich tubulin, porcine MAP rich tubulin, MAP tubulin
Shipping Condition Room temperature
Available
Shipping Temperature
AT
Storage Conditions
On Arrival: 4°C
Delivery Time
1-2 Weeks
FAQs

Question 1: What is the difference between 70% pure porcine brain tubulin ((Cat. #ML116) and 70% pure bovine brain tubulin (Cat. # ML113)?


Answer 1: The only difference is the source of the tubulin: bovine vs porcine brains. Functionally, there are no significant differences between tubulin isolated from bovine brains vs porcine brains. Stringent quality control and in-house testing has revealed no differences in polymerization, response to drugs (enhancers and inhibitors) or binding to accessory proteins (e.g., motor proteins). (See Comparison of Porcine and Bovine tubulin)


Question 2: Does tubulin polymerization using 70% pure porcine brain tubulin/30% MAPs ((Cat. #ML116) require additional enhancers such as glycerol or taxol?


Answer 2: No additional enhancers are required when using 2 mg/ml of the MAP-enriched 70% pure tubulin. The recommended polymerization reaction using 70% pure tubulin contains 180 &mu, l of 2 mg/ml tubulin in 80 mM PIPES pH 6.9, 0.5 mM EGTA, 2 mM MgCl2 and 1 mM GTP. Polymerization is started by incubation at 37°C and followed by absorption readings at 340 nm. Under these conditions polymerization reaches a maximal OD340 between 0.3 - 0.4 within 20 minutes. In this experimental set up (180 &mu, l volume in a spectrophotometer with a pathlength of 0.8 cm using Corning Costar&rsquo, s half area well plate Cat. # 3696) an OD340 of 0.16 is approximately equal to 1 mg per ml of tubulin polymer mass. Thus, under the conditions described, approximately 100% of the tubulin is polymerized. If polymerization enhancers such as taxol are to be used or tested, we recommend reducing the tubulin concentration to 1 mg/ml. These conditions will result in a more pronounced nucleation phase and a lower polymerization curve.

Weight (grams)
14
Product Uses
Studying the effects of MAPs on microtubule dynamics
Studying the binding sites between MAPs and tubulin.
Studying the effects of anti-microtubule drugs on microtubule polymerization.
Material
Tubulin and microtubule associated proteins (MAPs) has been purified from porcine brain by an adaptation of the method of Shelanski et al. (1). Tubulin is supplied as a white lyophilized powder. The protein composition is approximately 70% tubulin (55 kDa heterodimer) and 30% MAPs. The MAPs in this product act to stabilize microtubules and to enhance tubulin polymerization. MAP rich tubulin can polymerize efficiently at 1-2 mg/ml.
MAP-rich tubulin is also available from a bovine source (Cat. # ML113).
Biological Activity
One unit of MAP-rich tubulin is defined as 5.0 mg of protein (as determined by the Precision Red Protein Assay Reagent, Cat. # ADV02). MAP-rich tubulin will polymerize efficiently at protein concentrations above 1mg/ml and temperatures above 24C.

Note: The presented information and documents (Manual, Product Datasheet, Safety Datasheet and Certificate of Analysis) correspond to our latest update and should serve for orientational purpose only. We do not guarantee the topicality. We would kindly ask you to make a request for specific requirements, if necessary.

All products are intended for research use only (RUO). Not for human, veterinary or therapeutic use.

Amount: 5 x 1 mg
Available: In stock
available

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