Bis-MAL-Lysine-dPEG®4-TFP ester, product number QBD-10631, is a unique crosslinker from Vector Laboratories, Inc. The alpha (a) and epsilon (e) amines of lysine are functionalized with sulfhydryl-reactive maleimidopropyl groups. The carboxylic acid tail of lysine is conjugated to a single molecular weight, discrete polyethylene glycol (dPEG®) spacer containing an amine-reactive 2,3,5,6-tetrafluorophenyl (TFP) ester. The distance from the carbonyl carbon of the dPEG® spacer to the reactive site of the a-amine-conjugated maleimide group is 25 atoms (18.773 Å) long. The distance from the carbonyl carbon of the dPEG® spacer to the reactive site of the e-amine-conjugated maleimide group is 29 atoms (26.105 Å) long.nTFP esters react with primary and secondary amines to form stable amide bonds like the more widely used N-hydroxysuccinimidyl (NHS) esters. However, TFP esters demonstrate superior hydrolytic stability and higher reactivity with amines than NHS esters. The optimum pH for this reaction is 7.5 – 8.0. Thus, the product functions as a heterobifunctional crosslinker.nBy design, the two maleimide groups of Bis-MAL-Lysine-dPEG®4-TFP ester can be used to bridge disulfides. For example, this capability may be useful in antibodies following reduction of the disulfide groups. Moreover, the two maleimide groups can be used to dimerize small molecules or peptides, each of which possesses a single free thiol group. At pH 6.5 – 7.5, maleimide groups react chemoselectively with sulfhydryls. However, above pH 7.5, chemoselectivity is lost, as maleimide groups also will react with free amines.nPossible uses for Bis-MAL-Lysine-dPEG®4-TFP ester include the construction of antibody-drug conjugates (ADCs); immobilization of antibodies or antibody fragments on solid supports; and dimerization of sulfhydryl-containing peptides followed by crosslinking to an amine-modified surface.
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Click Chemistry Tools(CCT)公司位于美国亚利桑那州斯科茨代尔(Scottsdale,AZ)。自公司成立以来,一致致力于不断开发和扩展一系列连接产品。他们利用特别新的研究成果研发生产出新颖的交联和标记试剂。产品被广泛用于药物研发、癌症治疗以及各类诊断技术等。此外,CCT还可以提供个性化的定制产品,已满足不同用户的需求。目前CCT的产品线主要包括:Azides(Biotin-Azides)试剂、Bis-sulfone交联试剂、DBCO试剂、TCO试剂、Terminal Alkyne试剂、Tetrazine试剂、标记试剂盒以及分选用底物等。nFluoroprobes公司位于美国亚利桑那州斯科茨代尔(Scottsdale, AZ),自成立以来,一直致力于不断开发一系列的连接(linker)产品。利用特别新的研究成果研发生产出各类新颖的交联和标记试剂。其产品被广泛用于药物研发与筛选、疾病治疗方法和诊断技术等领域。此外,Fluoroprobes还可以根据客户的个性化需求提供各类定制连接产品。代表产品有Classic Fluorescent Dyes, AZDye, Cyanine Dyes, IR Dyes, MB dyes以及一些标记试剂盒等。nQuanta Biodesign公司位于美国中部的俄亥俄州,成立于1997年。也是专注于生产研发各类标记产品的品牌之一。其研发的产品与dPEG技术相结合,生产出他们独有的专利产品dPEG Building Blocks and Linkers,被广泛用于细胞治疗和分子诊断等研究领域。另外,还可为广大科研工作者提供多种化学修饰试剂以及传统Liner等。n目前上述三个品牌都已被被Vectorlabs收购并整合到Vectorlabs产品中