Human Topoisomerase II alpha and beta
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Human Topoisomerase II Alpha
Human topoisomerase II alpha is prepared by overexpressing in baculovirus-infected insect cells (Spodoptera frugiperda) and purifying it by methods developed in-house.
The enzyme is supplied in Dilution Buffer.
Store at -80°C.
It is recommended that larger pack sizes (500U and above) of the enzyme are aliquoted to avoid repeated freeze-thaw cycles.
See technical documents below for more detailed information and lot specific activities.
Technical Documents
Human Topoisomerase II Beta
Human topoisomerase II beta is prepared by overexpressing in baculovirus-infected insect cells (Spodoptera frugiperda) and purifying it by methods developed in-house.
The enzyme is supplied at a concentration of 2-10 U/μl in Dilution Buffer.
Store at -80°C. (Stable for 3 months undiluted).
It is recommended that the enzyme is aliquoted to avoid repeated freeze-thaw cycles.
Technical Documents
Human Topoisomerase II Decatenation Assay Kits
These contain human topo II and the catenated kDNA substrate in addition to the Assay and Dilution buffers for decatenation reactions. 1 U of human topo II will decatenate 200 ng of kDNA when incubated in 1X Assay buffer in a total reaction volume of 30 µl at 37°C for 30 minutes. The kits are available with either the alpha or beta forms of the enzyme.
Technical Documents
Human Topoisomerase II Relaxation Assay Kits
These contain human topo II and the supercoiled DNA substrate in addition to the Assay and Dilution buffers for relaxation reactions. 1 U of human topo II will relax 0.5 µg supercoiled pBR322 DNA in 30 minutes at 37°C. The kits are available with either the alpha or beta forms of the enzyme.
Technical Documents
Human Topoisomerase II Assay Kits For Cell Extracts
These kits are designed for assaying cell extracts and partially purified fractions containing human topo II. They contain kDNA substrate, Assay buffer, Dilution buffer, decatenated and linear DNA markers and stop buffer / loading dye.
The kit components are based on the standard assay which contains 500 ng substrate DNA per assay.
Technical Documents
High / Medium-Throughput Assay Kit - Human Topoisomerase II
The kit is supplied with sufficient human topo II enzyme, plasmid DNA substrate, buffers and other assay components* for 100 assays. The enzyme is supplied at a concentration of 10 U/μl in Dilution Buffer. The kit is also supplied with sufficient wash buffers for one 96-well plate. These buffers are supplied as 20X concentrates and must be diluted with ultra pure water prior to use. The kits are available with either the alpha or beta forms of the enzyme.
More information about this assay can be found on the "Services" page under "High/Medium Throughput Assay".
Kit issued with limited licence for individual use only.
Patent held by Inspiralis Ltd., Norwich, Norfolk, UK. (Patent No. GB0424953.8, US7838230)
Technical Documents
Human Topoisomerase II alpha 453 subunit
Human topoisomerase II alpha amino acids 1-453. This contains the ATPase domain, the activity of which can be stimulated by DNA (see Campbell and Maxwell (2002), J.Biol.Chem. 320 p.171. The protein is expressed in E.coli.
Technical Documents
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磷酸肌酸激酶（CPK），主要存在于骨骼肌和心肌，在脑组织中也存在，是参与体内的能量代谢的一种酶。在临床上主要用于诊断心肌梗塞。心肌梗塞患者发病后2－4小时，血液中此酶活动即开始升高。比血清中谷草转酸酶和乳酸脱氢酶的活力变化都出现得早。
临床意义：
（1）心肌梗塞后，CPK较谷草转氨酶和乳酸脱氢酶特异性高，但持续时间短，2－4天恢复正常。
（2）病毒性心肌炎，CPK也可升高，对诊断及预后有参考价值。
（3）进行性肌营养不良、多发性肌炎以及肌肉损伤时CPK也可升高。
（4）严重的心绞痛、心包炎、房颤、脑血管意外、脑膜炎以及心脏手术等，CPK可见升高。
大家好，有几个设计的药物分子需要测试活性，不知道谁能提供下能做相关测试服务的机构或个人信息不?非常感谢！
protease
水解蛋白质肽键的一类酶的总称。按其水解多肽的方式，可以将其分为内肽酶和外肽酶两类。内肽酶将蛋白质分子内部切断，形成分子量较小的月示和胨。外肽酶从蛋白质分子的游离氨基或羧基的末端逐个将肽键水解，而游离出氨基酸，前者为氨基肽酶后者为羧基肽酶。按其活性中心和最适pH值，又可将蛋白酶分为丝氨酸蛋白酶、巯基蛋白酶、金属蛋白酶和酸性蛋白酶。按其反应的最适pH值，分为酸性蛋白酶、中性蛋白酶和碱性蛋白酶。工业生产上应用的蛋白酶，主要是内肽酶。
蛋白激酶
protein kinase
又称蛋白质磷酸化酶(protein phosphakinase)。一类催化蛋白质磷酸化反应的酶。
