Recombinant Human His6-Ubiquitin Mutant with K48 only, CF Summary
Product Datasheets
Carrier Free
CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins.Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration.The carrier free version does not contain BSA.
In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard.In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.
UM-HK480
Formulation | Lyophilized from a solution of deionized water. |
Reconstitution | Reconstitute at 10 mg/ml in aqueous buffer. |
Shipping | The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. |
Stability & Storage: | Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
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Reconstitution Calculator
Background: Ubiquitin
Ubiquitin is a 76 amino acid (aa) protein that is ubiquitously expressed in all eukaryotic organisms. Ubiquitin is highly conserved with 96% aa sequence identity shared between human and yeast Ubiquitin, and 100% aa sequence identity shared between human and mouse Ubiquitin (1). In mammals, four Ubiquitin genes encode for two Ubiquitin-ribosomal fusion proteins and two poly-Ubiquitin proteins. Cleavage of the Ubiquitin precursors by deubiquitinating enzymes gives rise to identical Ubiquitin monomers each with a predicted molecular weight of 8.6 kDa. Conjugation of Ubiquitin to target proteins involves the formation of an isopeptide bond between the C-terminal glycine residue of Ubiquitin and a lysine residue in the target protein. This process of conjugation, referred to as ubiquitination or ubiquitylation, is a multi-step process that requires three enzymes: a Ubiquitin-activating (E1) enzyme, a Ubiquitin-conjugating (E2) enzyme, and a Ubiquitin ligase (E3). Ubiquitination is classically recognized as a mechanism to target proteins for degradation and as a result, Ubiquitin was originally named ATP-dependent Proteolysis Factor 1 (APF-1) (2,3). In addition to protein degradation, ubiquitination has been shown to mediate a variety of biological processes such as signal transduction, endocytosis, and post-endocytic sorting (4-7).
This Ubiquitin mutant contains only a single lysine, K48, with all other lysines mutated to arginine. This mutation renders Ubiquitin able to form poly-Ubiquitin chains with other Ubiquitin molecules only via the K48 lysine.
- Sharp, P.M. & W.-H. Li. (1987) Trends Ecol. Evol. 2:328.
- Ciechanover, A. et al. (1980 ) Proc. Natl. Acad. Sci. USA 77:1365.
- Hershko, A. et al. (1980) Proc. Natl. Acad. Sci. USA 77:1783.
- Greene, W. et al. (2012) PLoS Pathog. 8:e1002703.
- Tong, X. et al. (2012) J. Biol. Chem. 287:25280.
- Wei, W. et al. (2004) Nature 428:194.
- Wertz, I.E. et al. (2004) Nature 430:694.
Citation for Recombinant Human His6-Ubiquitin Mutant with K48 only, CF
R&D Systems personnel manually curate a database that contains references using R&D Systems products.The data collected includes not only links to publications in PubMed,but also provides information about sample types, species, and experimental conditions.
1Citation: Showing 1 - 1
- Variation in auxin sensing guides AUX/IAA transcriptional repressor ubiquitylation and destructionAuthors: M Winkler, M Niemeyer, A Hellmuth, P Janitza, G Christ, SL Samodelov, V Wilde, P Majovsky, M Trujillo, MD Zurbriggen, W Hoehenwart, M Quint, LIA Calderón VNat Commun, 2017;8(0):15706.Species: N/ASample Types: ProteinApplications: Enzyme Assay
FAQs
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Reconstitution Buffers
Reconstitution Buffer 1 (PBS)
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荧光定量PCR数据如下表,想通过GraphPadPrism5软件构建柱状图,但不知道是将2-△△Ct数据导入GraphPadPrism5软件,还是将Mean和SD导入GraphPadPrism5软件中。请大神赐教。另外Mean和SD是求的△△Ct的还是2-△△Ct的?
半定量反转录-聚合酶链反应(semi-quantitative reverse transcription and polymerase Chain reaction ,SqRT-PCR)是近年来常用的一种简捷、特异的定量RNA测定方法,通过mRNA反转录成cDNA,再进行PCR扩增,并测定PCR产物的数量,可以推测样品中特异mRNA的相对数量。
定量RT-PCR(quantitative reverse transcription and polymerase Chain reaction ,qRT-PCR)是在用一步法或两步法,在PCR反应体系中加入荧光基团,利用荧光信号积累实时监测整个PCR进程,最后通过标准曲线对未知模板进行定量分析的方法。
半定量RT-PCR需要跑电泳,根据条带亮度的强弱来判断模板拷贝数的高低或者是表达量的高低,而定量RT-PCR则无需电泳可以实时监测整个PCR的全程并且由给出的Ct值及Standard Curve来判断gene拷贝数的高低。
有大神做过人外周血全血miRNA的提取及后续PCR实验的吗?目前课题实验遇到瓶颈,求助大神!!!是否miRNA的PCR验证在全血做不出?必须要用血浆或者血清?目前血浆、血清也有部分样本。。。。有大神指条明路吗?
另外还有几个问题。就是跑出来的结果RFU居然有负值,这是怎么回事呢?几乎在0附近,但是在溶解曲线求导前的那个曲线。RFU又是从2400+开始下降的,这是为什么呢?
一般说来,应选用口碑较好的经过大量客户实验验证的荧光定量PCR试剂盒,因为只有选对了试剂盒才能够做成漂亮的实验结果来,特别是对于一些珍贵的样品更不能因为节约一些蝇头小利而糟蹋了样品本身。OneShineSybrGreenpreMix试剂盒在研发之初就考虑到了一般科研环境中方方面面的影响,例如我们就光照强度、光照时间对本产品的影响做了严苛的实验论证,得到1ml本产品盛装于1.5ml离心管中放置在2000Lux光照强度下可以保存12h,超过12h产品性能则会下降。
OneShineSybrGreenpreMix这款试剂盒除了价格适中外,还主要有以下优点:
1、适用于RealTimePCR反应,可以快速、准确地对目的基因进行定量检测。
2、在2×OneShineSybrGreenpreMix中,预先混有SybrGreen,PCR体系配制时只需入模板、引物、ddH2O即可,操作方便快捷。
3、含有更耐高温并持续稳定的DNAPolymerase,可以维持更多的循环数,提供了选择循环数更大的空间。更大的Ct值选择范围就意味着可以支持微量目的基因检测,检测范围fM-nM。
4、反应的Buffer更适合,使反应的基线更水平,无荧光污染信号。使线性期更陡峭,避免了Ct值的无效浮动。使平台期更平直。也确保了引物与模板能够更特异地结合。
5、SybrGreen更耐高温更足量,确保只要扩增反应在进行,目的DNA双链在增加,就有线性强度的荧光产生。
6、dNTPs更足量,确保反应有更高的平台期荧光信号。
7、Mg2+浓度更适合,确保线性期有爆发式的目的DNA片段合成,提高了线性期反应体系的扩增系数和线性期的长度。
8、更高的仪器适配性,SybrGreen染料可以被各大主流仪器的激发光所激发,产生明亮的荧光信号,有利于仪器对信号的捕捉和处理。
我们的产品与市面上目前常见的一种产品相比较有如下区别:
A公司的产品没有熔解温度,或者熔解温度太高。但是A公司的产品Ct值出现略早,这是因为A公司使用了一种小分子量的DNA聚合酶,这种酶与模板和引物的结合较快和较松散,但是扩增的效率和扩增的特异性就不能保证了,类似于温水煮青蛙不温不火的;这种酶还有一个弱点就是不耐冻融。我们使用的是Taq酶,是一种分子量较大的DNA聚合酶,这种酶与模板和引物结合比较慢,但是慢工出细活,这种酶的特异性较好,一旦激活便呈现爆发式的扩增,类似于不鸣则已一鸣惊人。我们产品熔解温度是A公司不可比拟的,线性范围和斜率也是A公司不可比拟的。详见下图:
1.模板提取(一般为RNA):Trizol、氯仿、异丙醇、无水乙醇、DEPC处理水
2.模板浓度测定:分光光度计或NanoDrop
3.逆转录:逆转录试剂盒(或者一步法试剂盒),这一步可以用普通PCR做,也可以用水域做。
4.荧光定量PCR试剂:通常有用SYBR Green Mix做的,但是这里建议你用EvaGreen做,灵敏度和平行性都要好于SYBR Green,并且如果你那是ABI或者Stratagene的PCR如果用SYBR Green还需要加一步Rox很麻烦。
5.其他:除了以上的那些还需要离心管、PCR管或板(Axygen反应比较好)、移液枪等,暂时就想到这么多。
跑到还有半小时的时候,跳出一个对话框:“analysiscannotproceed:notenoughsamplesdefined”,最后做出来的结果有扩增曲线但是没有熔解曲线,请各位大神帮忙解释一下。
如果要测量细胞表面2个受体的比率,最好用流式细胞仪来测量
在另外的一组管子中,加入已知拷贝数的DNA同时扩增,每个管子中加入的数量是不同的,但是从最小数目到最大数目的这个范围涵盖了样本中DNA拷贝数。
PCR反应完成后,把已知拷贝数DNA的量和PCR荧光Ct值制成标准曲线,再把待测样本的CT值和该标准曲线比对,就可以得到样本中的起始拷贝数了
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