- Species ReactivityHuman
- SpecificityDetects human Nogo-A in direct ELISAs and Western blots. In direct ELISAs, approximately 5% cross-reactivity with recombinant rat Nogo-A (aa 543-725) and recombinant human Nogo-B is observed..
- SourcePolyclonal Sheep IgG
- PurificationAntigen Affinity-purified
- ImmunogenChinese hamster ovary cell line CHO-derived recombinant human Nogo-A
Val566-Phe748
Accession # Q9NQC3 - FormulationLyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
- LabelUnconjugated
- Western Blot0.1 µg/mLRecombinant Human Nogo-A Fc Chimera, aa 566-748 (Catalog # 3515-NG)
- Immunocytochemistry5-15 µg/mLSee below
- ReconstitutionReconstitute at 0.2 mg/mL in sterile PBS.
- ShippingThe product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
- Stability & StorageUse a manual defrost freezer and avoid repeated freeze-thaw cycles.
- 12 months from date of receipt, -20 to -70 °C as supplied.
- 1 month, 2 to 8 °C under sterile conditions after reconstitution.
- 6 months, -20 to -70 °C under sterile conditions after reconstitution.
- Oertle, T. et al. (2003) FASEB J. 17:1238.
- GrandPre, T. et al. (2000) Nature 403:439.
- Yan, R. et al. (2006) Cell. Mol. Life Sci. 63:877.
- Teng, F.Y.H. et al. (2004) J. Neurochem. 89:801.
- Chen, M.S. et al. (2000) Nature 403:434.
- Morris, N.J. et al. (1999) Biochim. Biophys. Acta 1450:68.
- GenBank Accession # Q9NQC3.
- Oertle, T. et al. (2003) J. Neurosci. 23:5393.
- Fournier, A.E. et al. (2001) Nature 409:341.
- Wang, K.C. et al. (2002) Nature 420:74.
- Prinjha, R. et al. (2000) Nature 403:384.
- Dodd, D.A. et al. (2005) J. Biol. Chem. 280:12494.
- Li, M. et al. (2004) Eur. J. Biochem. 271:3512.
- Huber, A.B. and M.E. Schwab (2000) Biol. Chem. 381:407.
- Ng, C.E.L. and B.L. Tang (2002) J. Neurosci. Res. 67:559.
- Dodd, D.A. et al. (2005) J. Biol. Chem. 280:12494.
- Wang, X. et al. (2002) J. Neurosci. 22:5505.
- Acevedo, L. et al. (2004) Nat. Med. 10:382.
- Long Name:Reticulon 4A
- Entrez Gene IDs:57142 (Human); 68585 (Mouse); 83765 (Rat)
- Alternate Names:NI220; NogoA; Nogo-A; RTN4; RTN4A
Background:
Human Nogo-A (also reticulon-4) is a member of the reticulon family of transmembrane proteins. This family is characterized by the presence of a nonsignal sequence-containing N-terminus, a topologically conserved 200 amino acid (aa) C-terminus that contains two transmembrane domains with an ER-retention motif, and a punctate intracellular distribution within the ER that is reminescent of a reticulum (1-4). In human, Nogo exists in five isoforms (5-7). The full length human form (Nogo-A) is 1192 aa in length and contains a 1018 aa N-terminus, a 21 aa transmembrane segment, a 94 aa connecting “loop”, a second 21 aa transmembrane segment, and a 38 aa C-terminus. Three areas are of particular interest. One is a stretch of 66 aa within the 94 aa connecting loop. This segment is reported to bind to the GPI-linked Nogo receptor/p75 complex on axons and induce growth cone collapse (8-10). Two other areas in the N-terminus have also been discovered to have bioactivity (8, 11, 12). Based on rat, aa 57-184 in human (aa 59-172 in rat) should block fibroblast spreading, while aa 566-748 in human (aa 544-725 in rat) block neurite outgrowth and block fibroblast spreading (8, 12, 13). The exact topology of Nogo-A is unclear. The N- and C-termini may be extracellular with the “loop” region intracellular, or the situation could be reversed (13-15). Alternatively, the loop region and N-terminus may be on the same side of the membrane (3, 8). The four additional isoforms are shorter than Nogo-A (199 aa [Nogo-C], 373 aa [Nogo-B], 392 aa and 986 aa, respectively) (7). Although highly divergent, all contain the same C-terminal stretch, aa 1005-1192. Both Nogo-B and C are reported to complex with Nogo-A (16). Notably, Nogo-A is expressed in neurons, endothelial cells. oligodendrocytes, fibroblasts and myoblasts (12, 16-18). Human Nogo-A is 78% aa identical to mouse and rat Nogo-A overall, with 98% aa identity in the loop region and approximately 80% aa identity in the aa 566-748 segment.
ebiomall.com
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下图为ELISA原理图,夹心法即Sandwich ELISA,竞争法就是Competitive ELISA
向左转|向右转
(2)封闭:将已包被的板用洗涤液洗涤2次,每孔加入120 μL封闭液,封闭一段时间,取出,甩干备用。
(3)竞争反应:在制备好的板中每孔加入50 μL系列浓度的标准品溶液和50 μL稀释好的酶标抗体溶液,孵育一段时间。
(4)洗板:用洗涤液洗涤5次。
(5)显色反应:每孔加入显色溶液100 μL,孵育一段时间。
(6)终止:每孔各加入终止液,在酶标仪上测定各孔的吸光值。
1.包被:用0.05MPH9.牰碳酸盐包被缓冲液将抗体稀释至蛋白质含量为1~10μg/ml。在每个聚苯乙烯板的反应孔中加0.1ml,4℃ 过夜。次日,弃去孔内溶液,用洗涤缓冲液洗3次,每次3分钟。(简称洗涤,下同)。
2. 加样:加一定稀释的待检样品0.1ml于上述已包被之反应孔中,置37℃ 孵育1小时。然后洗涤。(同时做空白孔,阴性对照孔及阳性对照孔)。
3. 加酶标抗体:于各反应孔中,加入新鲜稀释的酶标抗体(经滴定后的稀释度)0.1ml。37℃ 孵育0.5~1小时,洗涤。
4. 加底物液显色:于各反应孔中加入临时配制的TMB底物溶液0.1ml,37℃ 10~30分钟。
5. 终止反应:于各反应孔中加入2M硫酸0.05ml。
6. 结果判定:可于白色背景上,直接用肉眼观察结果:反应孔内颜色越深,阳性程度越强,阴性反应为无色或极浅,依据所呈颜色的深浅,以“+”、“-”号表示。也可测OD值:在ELISA检测仪上,于450nm(若以ABTS显色,则410nm)处,以空白对照孔调零后测各孔OD值,若大于规定的阴性对照OD值的2.1倍,即为阳性。
间接法
1.用包被缓冲液将已知抗原稀释至1~10μg/ml,每孔加0.1ml,4℃过夜;
2.次日洗涤3次;
3.加一定稀释的待检样品(未知抗体)0.1ml于上述已包被之反应孔中,置37℃孵育1小时,洗涤;
4.(同时做空白、阴性及阳性孔对照)于反应孔中,加入新鲜稀释的酶标第二抗体(抗抗体)0.1ml;
5.37℃孵育35-60分钟,洗涤;
6.’最后一遍用DDW洗涤。
其余步骤同“双抗体夹心法”的4、5、6。
1.标准曲线的标准品是否一定要梯度稀释,为什么?我试过非梯度稀释的,也可以达到线性R2=0.99.
2.我用了CurveExpert做标曲,自动搜索后发现有10种提供的方程,各种形式的,其中一个十分适合我的实验结果(LogisticModel),而其他的感觉又不适合,因为结果常常为负值。这又是为啥捏?
3.实验的酶标仪最大OD值可以测到4,如果我的测量结果在1.3,是否像其他人所说的>1了就不准确了。
4.利用夹心法进行定量分析是否一定要使用线性方程?
不好意思啊,一下问了这么多问题,最近做了一个月的ELISA,完全摸不清头脑啊。谢谢各位了
后采用豆粉浸提12000g离心取上清的方式,发现10的5、6、7、8次方稀释度所测OD值随着稀释度的升高而增大,比如一个样品的OD值5次方为0.2558次方为0.349;
刚接触相关知识,试验任务较重,心中疑问较大,恳请各位高手及时指正,诚谢!
表面抗体是双抗原夹心法
E抗体和核心抗体是竞争抑制法或间接法
如果用双抗体夹心法,第二个抗体可以用多抗,这样保证你的抗原会被结合,多抗可以直接带HRP标记或者可以用HRP标记二抗去和多抗结合。
目前,我用该蛋白的鼠源性单抗来包被ELISA板子,5%BSA37度封闭二小时后,洗涤四次后将板子分三个组加入抗原:其中一个组中加入的是我重组的蛋白,另一个组为用其它方法证实含该蛋白的人体内血清,最后一个组加入PBS。37度一小时后洗涤四次后每孔加入我制备的兔源性多抗。37度一小时洗涤六次后我再加入酶标记的抗兔的抗体37度40分钟后洗涤六次后TMB显色。
问题就在我显色后所有的孔都是阳性,其中以抗原为我的重组蛋白组与PBS组OD值最高,两组都可以达到1.8以上,而加入的抗原为人体血清组低,为0.6-1.0不等。
后面我优化条件,封闭液用过5%的脱脂奶粉,2%的BSA,包被的单抗浓度摸了梯度,加入的多抗也摸了梯度,酶标的抗体也摸了梯度。结果都没有改变,连趋势每次都是一样以重组蛋白组与PBS组OD最高。
今天我还试着把抗原换成其它蛋白也做出了强阳性?
请教各位高手,我的ELISA该如何往下面做了啊,是不是我的抗体本身有问题呢?
对了,我包被用的单抗是用GE公司的预装柱纯化的,很纯,在考染中是看不到一条杂带的。

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