STRAD pseudokinases regulate axogenesis and LKB1 stability.

STRAD pseudokinases regulate axogenesis and LKB1 stability.
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DOI:
10.1186/1749-8104-9-5
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发表时间:
2014-03-04
期刊:
影响因子:
3.6
通讯作者:
Barnes AP
Barnes AP
中科院分区:
生物学3区
文献类型:
--
作者:
Veleva-Rotse BO;Smart JL;Baas AF;Edmonds B;Zhao ZM;Brown A;Klug LR;Hansen K;Reilly G;Gardner AP;Subbiah K;Gaucher EA;Clevers H;Barnes AP

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神经元极化是发育中大脑形态发生和连接的重要步骤。丝氨酸/苏氨酸激酶LKB 1是细胞极性、代谢、肿瘤发生的关键调节因子,并且是轴突形成所需的。它由两种相关的和进化上保守的假激酶STe 20-Related ADapters(STRAD)α和β进行变构调节。STRADα和STRADβ在神经系统发育中的作用尚未完全确定,也不知道它们是否具有不同的功能。我们发现STRADα是高度剪接的,似乎是原始的STRAD蛋白。我们报告说,每个STRAD是足够的轴突生长和促进细胞存活在发展中的皮质。我们还揭示了LKB 1和STRADα之间在体内的相互蛋白稳定关系,STRADα通过细胞质区室化特异性地维持LKB 1蛋白水平。我们证明了STRADβ在轴突发生中的新作用,并首次在体内表明STRADα而不是STRADβ负责LKB 1蛋白的稳定性。
Neuronal polarization is an essential step of morphogenesis and connectivity in the developing brain. The serine/threonine kinase LKB1 is a key regulator of cell polarity, metabolism, tumorigenesis, and is required for axon formation. It is allosterically regulated by two related and evolutionarily conserved pseudokinases, STe20-Related ADapters (STRADs) α and β. The roles of STRADα and STRADβ in the developing nervous system are not fully defined, nor is it known whether they serve distinct functions. We find that STRADα is highly spliced and appears to be the primal STRAD paralog. We report that each STRAD is sufficient for axogenesis and promoting cell survival in the developing cortex. We also reveal a reciprocal protein-stabilizing relationship in vivo between LKB1 and STRADα, whereby STRADα specifically maintains LKB1 protein levels via cytoplasmic compartmentalization. We demonstrate a novel role for STRADβ in axogenesis and also show for the first time in vivo that STRADα, but not STRADβ, is responsible for LKB1 protein stability.
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