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    • 2. 发明申请
    • COMPOSITION AND METHOD FOR INHIBITION OF PKNG FROM MYCOBACTERIUM TUBERCULOSIS
    • 用于抑制来自MYCOBACTERIUM TUBCCOSOS的PKNG的组合物和方法
    • WO2014204872A2
    • 2014-12-24
    • PCT/US2014/042592
    • 2014-06-16
    • COMPLEXA, INC.
    • BATTHYANY DIGHIERO, Carlos, IgnacioDURAN, Rosario
    • A61K31/201
    • PknG from Mycobacterium tuberculosis is a Ser/Thr protein kinase that regulates key metabolic processes within the bacterial cell as well as signaling pathways from the infected host cell. This multi-domain protein has a conserved canonical kinase domain with N- and C-terminal flanking regions of unclear functional roles. The N-terminus harbors a rubredoxin-like domain (Rbx), a bacterial protein module characterized by an iron ion coordinated by four cysteine residues. Disruption of Rbx-metal binding site by simultaneous mutations of all the key cysteine residues significantly impairs PknG activity. This encouraged us to evaluate the effect of a nitro- fatty acid (9- and 10-nitro-octadeca-9-cis-enoic acid; OA-NO 2 ) on PknG activity. Fatty acid nitroalkenes are electrophilic species produced during inflammation and metabolism that react with nucleophilic residues of target proteins (i.e. Cys and His), modulating protein functions and subcellular distribution in a reversible-manner. In accordance with the present invention, administration of OA-NO 2 inhibits kinase activity by covalently adducting PknG outside its catalytic domain. Mass spectrometry-based analysis established that cysteines located at Rbx are the specific targets of the nitroalkene. Cys-nitroalkylation is a Michael addition reaction typically reverted by thiols. However, the reversible OA-NO 2 mediated nitroalkylation of the kinase results in an irreversible inhibition of PknG. Cys adduction by OA-NO 2 induced iron release from the Rbx domain, revealing a new strategy for the specific inhibition of PknG. Altogether our results highlight the relevance of Rbx domain as an interesting new target for PknG inhibition. In addition, the reactivity of electrophilic fatty acids towards Rbx-Cys points to its potential as modulators of critical cell signaling activities and as model molecules for specific PknG inhibitors development.
    • 来自结核分枝杆菌的PknG是一种Ser / Thr蛋白激酶,其调节细菌细胞内的关键代谢过程以及来自受感染宿主细胞的信号传导途径。 该多结构域蛋白具有保守的规范激酶结构域,具有不明确功能作用的N-和C-末端侧翼区。 N末端含有一个rubredoxin样结构域(Rbx),一个细胞蛋白模块,其特征是由四个半胱氨酸残基配位的铁离子。 通过所有关键半胱氨酸残基的同时突变破坏Rbx-金属结合位点显着损害PknG活性。 这促使我们评估硝基脂肪酸(9-和10-硝基 - 十八碳-9-顺式 - 烯酸; OA-NO2)对PknG活性的影响。 脂肪酸硝基烯烃是在炎症和代谢期间产生的亲核物质,其与靶蛋白(即Cys和His)的亲核残基反应,以可逆方式调节蛋白质功能和亚细胞分布。 根据本发明,OA-NO2的施用通过在其催化结构域外共价加成PknG来抑制激酶活性。 基于质谱法的分析表明,位于Rbx的半胱氨酸是硝基烯烃的具体目标。 Cys-硝基烷基化是通常由硫醇还原的迈克尔加成反应。 然而,可逆的OA-NO2介导的激酶的硝基烷基化导致PknG的不可逆抑制。 通过OA-NO2诱导的Cys诱导诱导铁从Rbx结构域的释放,揭示了PknG特异性抑制的新策略。 总之,我们的研究结果突出了Rbx结构域作为PknG抑制的一个有趣的新目标的相关性。 此外,亲电脂肪酸对Rbx-Cys的反应性指示其作为关键细胞信号传导活性的调节剂的潜力,并且作为特异性PknG抑制剂发育的模型分子。