
- SynonymComplement C5,C5,CPAMD4
- SourceHuman Complement C5, His Tag (CO5-H52Ha) is expressed from human 293 cells (HEK293). It contains AA Gln 19 - Cys 1676 (Accession # P01031-1).Predicted N-terminus: Gln 19 (β chain) & Thr 678 (α chain)Request for sequence
- Molecular Characterization
This protein carries a polyhistidine tag at the C-terminus.The mature form of Complement C5 is a disulfide-linked heterodimer composed of proteolytically cleaved α and β chain. Each α and β chain has a calculated MW of 73.9 kDa (β chain) and 114.4 kDa (α chain). The protein migrates as 66 kDa (β chain) and 110 kDa (α chain) under reducing (R) condition (SDS-PAGE) due to glycosylation.
- EndotoxinLess than 1.0 EU per μg by the LAL method.
- Purity
>90% as determined by SDS-PAGE.
- Formulation
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4. Normally trehalose is added as protectant before lyophilization.
Contact us for customized product form or formulation.
- Reconstitution
Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
- Storage
For long term storage, the product should be stored at lyophilized state at -20°C or lower.
Please avoid repeated freeze-thaw cycles.
This product is stable after storage at:
- -20°C to -70°C for 12 months in lyophilized state;
- -70°C for 3 months under sterile conditions after reconstitution.

Human Complement C5, His Tag on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 90%.

Immobilized Human Complement C5, His Tag (Cat. No. CO5-H52Ha) at 2 μg/mL (100 μL/well) can bind Anti-C5a (Human IgG1) with a linear range of 0.2-3 ng/mL (QC tested).
- BackgroundDerived from proteolytic degradation of complement C5, C5 anaphylatoxin is a mediator of local inflammatory process. C5 precursor is first processed by the removal of 4 basic residues, forming two chains, beta and alpha, linked by a disulfide bond. C5 convertase activates C5 by cleaving the alpha chain, releasing C5a anaphylatoxin and generating C5b (beta chain + alpha" chain). Activation of C5 by a C5 convertase initiates the spontaneous assembly of the late complement components, C5-C9, into the membrane attack complex. C5b has a transient binding site for C6. The C5b-C6 complex is the foundation upon which the lytic complex is assembled. The C5a anaphylatoxin interacts with C5AR1 and tick complement inhibitor. C5a is also a potent chemokine which stimulates the locomotion of polymorphonuclear leukocytes and directs their migration toward sites of inflammation.
- References
Please contact us via TechSupport@acrobiosystems.com if you have any question on this product.
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1、 缓冲溶液对反应物的测定没有干扰
2、缓冲组分的浓度为1:1
3、有足够的缓冲容量
4、缓冲溶液的PH应在所需范围内
5、组成缓冲溶液的弱碱PKB和弱酸PKA应接近或等于所需的POH值或PH值(PH+POH=14)
配制
只要知道缓冲对的PH值,和要配制的缓冲液的pH值(及要求的缓冲液总浓度),就能按公式计算[盐]和[酸]的量。这个算法涉及对数换算,较麻烦,前人为减少后人的计算麻烦,已为我们总结出pH值与缓冲液对离子用量的关系并列出了表格。只要我们知道要配制的缓冲液的pH,经查表便可计算出所用缓冲剂的比例和用量。例如配制500nmpH5.8浓度为0.1M磷酸缓冲液。
经查表知pH5.8浓度为0.2M Na2HPO48.0毫升,而0.2M Na2HPO492.0毫升。依此可推论出配制100ml0.1M的磷酸缓冲液需要0.1M Na2HPO48.0毫升,而0.1M Na2HPO4需要92.0毫升。
计算好后,按计算结果准确称好固态化学成分,放于烧杯中,加少量蒸馏水溶解,转移入50ml容量瓶,加蒸馏水至刻度,摇匀,就能得到所需的缓冲液。
各种缓冲溶液的配制,均按表格按比例混合,某些试剂,必须标定配成准确浓度才能进行,如醋酸、氢氧化钠等。另外,所有缓冲溶剂的配制计量都能从以上的算式准确获得。
1 mmol/LEDTA(pH 8.0)
因为含有以上两种物质,所以称为TE。
配制分三步:
1)1 M Tris-HCl (pH 8.0) 50 ml的配制:称取Tris碱6.06 g,加超纯水40 ml溶解,滴加浓HCl约2.1 ml调pH至8.0,定容至50 ml。
2)0.5 M EDTA(pH 8.0)50 ml的配制:称取EDTA-Na2·2H2O 9.306 g,加超纯水35 ml,剧烈搅拌,用约1 g NaOH颗粒调pH至8.0,定容至50 ml。(EDTA二钠盐需加入NaOH将pH调至接近8.0时,才会溶解。)
3)1×TE(10 mM Tris-HCl,pH 8.0;1 mM EDTA,pH 8.0)的配制:
作用:
TE缓冲液是弱碱性,对DNA的碱基有保护性,(DNA在它是的稳定性较好,不易破坏其完整性或产生开环及断裂),包括提取好的DNA也要放在TE缓冲液是保存. 10mMTris-Hcl,pH有7.47.68.0三种。
EDTA调到8.0是为了更好溶解,其他只要调到相应pH就可以。Tris在7-8附近缓冲能力很强,所以加8.0的EDTA下去后,不会改变pH。

