TPE-MI (Tetraphenylethene maleimide) 在通过马来酰亚胺与硫醇结合之前本质上是非荧光的。TPE-MI 荧光在标记游离半胱氨酸硫醇时被激活，该硫醇通常埋在展开时暴露的球状蛋白质的核心中。TPE-MI 可用于测量细胞未折叠蛋白质负荷。TPE-MI 可以报告亨廷顿病诱导多能干细胞模型中的蛋白质平衡失衡，以及在形成可见聚集物之前转染突变亨廷顿外显子1的细胞。TPE-MI 还检测双氢青蒿素治疗疟疾寄生虫后的蛋白质损伤。
货号:ajcx37226
CAS:1245606-71-6
分子式:C31H23NO2
分子量：441.52
溶解度:N/A
纯度：98%
存储：Store at -20°C
库存：现货

Background:

TPE-MI (Tetraphenylethene maleimide) is a thiol probe for measuring unfolded protein load and proteostasis in cells. TPE-MI can report imbalances in proteostasis in induced pluripotent stem cell models of Huntington disease, as well as cells transfected with mutant Huntington exon 1 before the formation of visible aggregates. TPE-MI also detects protein damage following dihydroartemisinin treatment of the malaria parasitesPlasmodium falciparum [1][2].

TPE-MI is inherently non-fluorescent until it is conjugated to a thiol via the maleimide. TPE-MI fluorescence is activated upon labelling free cysteine thiols, normally buried in the core of globular proteins that are exposed upon unfolding[1].TPE-MI (50 µM; 0-60 min) exhibits a homogeneous cytoplasmic labelling pattern in live HeLa cells, with a lower level of labelling in the nucleus and apparent concentration in the region of the ER, which was anticipated as a major location for protein synthesis and folding[1].At the high expression level, the mutant 97Q form of Httex1 was associated with an elevated TPE-MI fluorescence signal relative to a non-disease-causing 25Q form of Httex1[1].TPE-MI consists of the aggregation-induced emission (AIE) fluorogen tetraphenylethane (TPE) and the thiol-reactive group maleimide (MI), thereby possessing both AIE phenomenon and selective thiol reactivity[2].

[1]. Chen MZ, et al. A thiol probe for measuring unfolded protein load and proteostasis in cells. Nat Commun. 2017;8(1):474. Published 2017 Sep 7. [2]. Hu Q, et al. In Situ Monitored Vortex Fluidic-Mediated Protein Refolding/Unfolding Using an Aggregation-Induced Emission Bioprobe. Molecules. 2021;26(14):4273. Published 2021 Jul 14.