ProSpec-Clusterin Human, Serum/CYT-1131

CLI, AAG4, KUB1, SGP2, SGP-2, SP-40, TRPM2, MGC24903, Clusterin, Apolipoprotein J, Apo-J.

Clusterin also named Apolipoprotein J is a 75-80 kD disulfide-linked heterodimeric protein containing about 30% of N-linked carbohydrate rich in sialic acid but truncated forms targeted to the nucleus have also been identified.
The precursor polypeptide chain is cleaved proteolytically to remove the 22-mer secretory signal peptide and subsequently between residues 227/228 to generate the a and b chains. These are assembled in anti-parallel to give a heterodimeric molecule in which the cysteine-rich centers are linked by5 disulfide bridges and are flanked by 2 predicted coiled-coil a-helices and three predicted amphipathic a-helices.
Across a wide range of species clusterin shows a high degree of sequence homology ranging from 70% to 80%. It is nearly ubiquitously expressed in most mammalian tissues and can be found in plasma, milk, urine, cerebrospinal fluid and semen.
It is able to bind and form complexes with numerous partners such as immunoglobulins, lipids, heparin, bacteria, complement components, paraoxonase, beta amyloid, leptin and others. Clusterin has been ascribed a plethora of functions such as phagocyte recruitment, aggregation induction, complement attack prevention, apoptosis inhibition, membrane remodeling, lipid transport, hormone transport and/or scavenging, matrix metalloproteinase inhibition.
Clusterin is an extracellular chaperone protecting cells from stress induced insults caused by degraded and misfolded protein precipitates.
Clusterin is up- or down regulated on the mRNA or protein level in many pathological and clinically relevant situations including cancer, organ regeneration, infection, Alzheimer disease, retinitis pigmentosa, myocardial infarction, renal tubular damage, autoimmunity and others.

Clusterin 也称为载脂蛋白 J，是一种 75-80 kD 二硫键连接的异二聚体蛋白，含有约 30% 的富含唾液酸的 N 连接碳水化合物，但也已鉴定出靶向细胞核的截短形式。
前体多肽链被蛋白水解切割以去除 22-mer 分泌信号肽，随后在残基 227/228 之间生成 a 和 b 链。它们以反平行方式组装，得到异二聚体分子，其中富含半胱氨酸的中心通过 5 个二硫键连接，两侧为 2 个预测的卷曲螺旋 a-螺旋和三个预测的两亲性 a-螺旋。
在广泛的物种中，clusterin 显示出高度的序列同源性，范围从 70% 到 80%。它几乎在大多数哺乳动物组织中普遍表达，可以在血浆、乳汁、尿液、脑脊液和精液中找到。
它能够与免疫球蛋白、脂质、肝素、细菌、补体成分、对氧磷酶、β淀粉样蛋白、瘦素等众多伙伴结合并形成复合物。凝聚素被赋予了过多的功能，例如吞噬细胞募集、聚集诱导、补体攻击预防、细胞凋亡抑制、膜重塑、脂质转运、激素转运和/或清除、基质金属蛋白酶抑制。
Clusterin 是一种细胞外伴侣蛋白，可保护细胞免受由降解和错误折叠的蛋白质沉淀物引起的应激损伤。
在包括癌症、器官再生、感染、阿尔茨海默病、色素性视网膜炎、心肌梗塞、肾小管损伤、自身免疫等在内的许多病理和临床相关情况下，Clusterin 的 mRNA 或蛋白质水平上调或下调。

Human Serum.

Filtered White lyophilized powder.

Human native Clusterin was filtered and lyophilized from 0.5mg/ml in phosphate buffer saline, pH 7.5 and 5% trehalose.

It is recommended to add deionized H₂O to prepare a working stock solution of 0.5mg/ml and let the lyophilized pellet dissolve completely. Product is not sterile! Please filter the product by an appropriate sterile filter before using it in the cell culture.

建议加入去离子水配制 0.5mg/ml 的工作原液，让冻干颗粒完全溶解。 产品不是无菌的！ 在细胞培养中使用之前，请用适当的无菌过滤器过滤产品。

Store lyophilized Clusterin at -20°C. Aliquot the product after reconstitution to avoid repeated freezing/thawing cycles. Reconstituted protein can be stored at 4°C for a limited period of time; it does not show any change after two weeks at 4°C.

将冻干的 Clusterin 储存在 -20°C。 重组后分装产品以避免重复的冷冻/解冻循环。 重组蛋白可在 4°C 下保存一段时间； 在 4°C 下两周后它没有显示任何变化。

Greater than 90% as determined by PAGE.

Prospec’s products are furnished for LABORATORY RESEARCH USE ONLY. The product may not be used as drugs, agricultural or pesticidal products, food additives or household chemicals.

ProSpec 的产品仅供实验室研究使用。 它们不得用作药物、农业或农药产品、食品添加剂或家用化学品。