Azidobupramine, an Antidepressant-Derived Bifunctional Neurotransmitter Transporter Ligand Allowing Covalent Labeling and Attachment of Fluorophores
作者:Thomas Kirmeier、Ranganath Gopalakrishnan、Vanessa Gormanns、Anna M. Werner、Serena Cuboni、Georg C. Rudolf、Georg Höfner、Klaus T. Wanner、Stephan A. Sieber、Ulrike Schmidt、Florian Holsboer、Theo Rein、Felix Hausch
DOI:10.1371/journal.pone.0148608
日期:——
The aim of this study was to design, synthesize and validate a multifunctional antidepressant probe that is modified at two distinct positions. The purpose of these modifications was to allow covalent linkage of the probe to interaction partners, and decoration of probe-target complexes with fluorescent reporter molecules. The strategy for the design of such a probe (i.e., azidobupramine) was guided by the need for the introduction of additional functional groups, conveying the required properties while keeping the additional moieties as small as possible. This should minimize the risk of changing antidepressant-like properties of the new probe azidobupramine. To control for this, we evaluated the binding parameters of azidobupramine to known target sites such as the transporters for serotonin (SERT), norepinephrine (NET), and dopamine (DAT). The binding affinities of azidobupramine to SERT, NET, and DAT were in the range of structurally related and clinically active antidepressants. Furthermore, we successfully visualized azidobupramine-SERT complexes not only in SERT-enriched protein material but also in living cells stably overexpressing SERT. To our knowledge, azidobupramine is the first structural analogue of a tricyclic antidepressant that can be covalently linked to target structures and further attached to reporter molecules while preserving antidepressant-like properties and avoiding radioactive isotopes.
本研究的目的是设计、合成和验证一种多功能抗抑郁探针,该探针在两个不同的位置进行了修饰。这些修饰的目的是使该探针能够与相互作用伙伴进行共价结合,并将荧光报告分子装饰在探针-靶标复合物上。设计这种探针(即叠氮布普品)的策略是基于引入额外功能基团的需要,以赋予所需的性质,同时将附加部分保持尽可能小。这应该可以最小化改变新探针叠氮布普品抗抑郁特性的风险。为此,我们评估了叠氮布普品与已知靶位点的结合参数,例如血清素(SERT)、去甲肾上腺素(NET)和多巴胺(DAT)的转运体。叠氮布普品与SERT、NET和DAT的结合亲和力处于结构相关且临床活跃的抗抑郁药物的范围内。此外,我们成功地在富含SERT的蛋白质材料以及在稳定过表达SERT的活细胞中可视化了叠氮布普品-SERT复合物。据我们所知,叠氮布普品是第一种能够与靶结构共价结合并进一步连接到报告分子上的三环抗抑郁药结构类比,同时保留抗抑郁特性并避免放射性同位素。