The conserved motor domain of human CENP-E (KIF10) was expressed in a prokaryotic system. The recombinant protein contains a GST-tag at the amino terminal end and has a combined molecular weight of 71 kDa. The protein has been determined to be biologically active in a microtubule-activated ATPase activity test. The protein is supplied as a white lyophilized powder.
Protein purity is determined by scanning densitometry of Coomassie Blue stained protein on a 12% polyacrylamide gel. All kinesin motor domains are >85% pure. See figure 1 for example purities.
Biological Activity - Microtubule Activated ATPase Assay
CENP-E ATPase activity was measured by monitoring real time free phosphate generation using the Kinesin ELIPA Assay Kit (Cat. # BK060). The assay is based upon an absorbance shift (330 nm - 360 nm) that occurs when 2-amino-6-mercapto-7methylpurine ribonucleoside (MESG) is catalytically converted to 2-amino-6-mercapto-7-methylpurine in the presence of inorganic phosphate (Pi). One molecule of Pi will yield one molecule of 2amino-6-mercapto-7-methylpurine in an essentially irreversible reaction. Hence, the absorbance at 360 nm is directly proportional to the amount of Pi generated in the kinesin ATPase reaction. Under the conditions outlined below, the Vmax for CENP-E microtubule-activated ATPase activity is >900 nmoles ATP generated per minute per mg of CP01 (Figure 2). The ATPase rate using a 10 minute endpoint assay (Kinesin ATPase End Point Assay Kit, Cat. # BK053) is >900 nmoles ATP per minute per mg of CP01 (data not shown).
Figure 2. CENP-E microtubule-activated ATPase activity using the Kinesin ELIPA Assay Kit (Cat. # BK060)
|Labrière, Christophe et al.||New MKLP-2 inhibitors in the paprotrain series: Design, synthesis and biological evaluations||Bioorganic and Medicinal Chemistry||2016||ISSN 1464-3391|
|Funk, C. Joel et al.||Development of high-throughput screens for discovery of kinesin adenosine triphosphatase modulators||Analytical Biochemistry||2004||ISSN 0003-2697|
|Wada, Yuuko et al.||Evidence for a Novel Affinity Mechanism of Motor-assisted Transport Along Microtubules||Molecular Biology of the Cell||2000||ISSN 1059-1524|
|Endow, Sharyn A. et al.||Determinants of Kinesin Motor Polarity||Science||1998||ISSN 0036-8075|
Question 1: What is the minimum concentration this kinesin motor protein can be stored at?
Answer 1: For storage at -70°C the protein concentration should not be less than 5 mg/ml. Kinesin diluted below 5 mg/ml should not be re-frozen as it will lose activity.
Question 2: What is the most common use of this motor domain protein?
Answer 2: The CENP-E motor domain protein is most commonly used in conjunction with microtubules to measure microtubule-stimulated CENP-E ATPase activity. The ATPase activity can be measured with an endpoint or kinetic assay. Other uses of this motor protein include identification/characterization of proteins or small molecules that affect motor ATPase activity and identification/characterization of proteins or small molecules that affect motor/microtubule interactions.
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