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Characterization of the CaMKKβ-AMPK signaling complex

机译:CaMKKβ-AMPK信号复合物的表征

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The AMP-activated protein kinase (AMPK) is a critical regulator of energy homeostasis, and is a potential target for treatment of metabolic diseases as well as cancer. AMPK can be phosphorylated and activated by the tumor suppressor LKB1 or the Ca~(2+)/CaM-dependent protein kinase kinase β (CaMKKβ). We previously identified a physical complex between CaMKKβ and AMPK (Anderson, K. A., Ribar, T. J., Lin, F., Noeldner, P. K., Green, M. F., Muehlbauer, M. J., Witters, L. A., Kemp, B. E., and Means, A. R. (2008) Cell Metabolism 7, 377-388). Here we expand our analysis of the CaMKKβ-AMPK signaling complex and show that whereas CaMKKβ can form a complex with and activate AMPK, CaMKKβ cannot. In addition, we show that CaMKKβ and AMPK associate through their kinase domains, and CaMKKβ must be in an active conformation in order to bind AMPK but not to associate with an alternative substrate, Ca~(2+)/Calmodulin-dependent protein kinase IV (CaMKIV). Our results demonstrate that CaMKKβ and AMPK form a unique signaling complex. This raises the possibility that the CaMKKβ-AMPK complex can be specifically targeted by small molecule drugs to treat disease.
机译:AMP激活的蛋白激酶(AMPK)是能量稳态的关键调节剂,并且是治疗代谢性疾病以及癌症的潜在靶标。 AMPK可以被肿瘤抑制因子LKB1或Ca〜(2 +)/ CaM依赖性蛋白激酶激酶β(CaMKKβ)磷酸化并激活。我们先前确定了CaMKKβ和AMPK之间的物理复合物(Anderson,KA,Ribar,TJ,Lin,F.,Noeldner,PK,Green,MF,Muehlbauer,MJ,Witters,LA,Kemp,BE和Means,AR(2008细胞代谢7,377-388)。在这里,我们扩展了对CaMKKβ-AMPK信号复合物的分析,并表明尽管CaMKKβ可以与AMPK形成复合物并激活AMPK,但CaMKKβ不能。此外,我们显示CaMKKβ和AMPK通过它们的激酶结构域缔合,并且CaMKKβ必须处于活性构象才能结合AMPK,但不能与其他底物Ca〜(2 +)/钙调蛋白依赖性蛋白激酶IV缔合。 (CaMKIV)。我们的结果表明,CaMKKβ和AMPK形成独特的信号复合物。这增加了CaMKKβ-AMPK复合物可以被小分子药物特异性靶向治疗疾病的可能性。

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