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The RanBP2/RanGAP1*SUMO1/Ubc9 complex

机译:RanBP2 / RanGAP1 * SUMO1 / Ubc9复合体

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Posttranslational modification of proteins with SUMO and the RanGTP/GDP cycle are two essential cellular mechanisms contributing directly or indirectly to almost every cellular event. The SUMO E3 ligase RanBP2 (Nup358) and the Ran GTPase activating protein (RanGAP1) are known to form a stable complex throughout the cell cycle suggesting a link between sumoylation of proteins and RanGTP hydrolysis. In a recent study we demonstrated that the stable complex of RanBP2, sumoylated RanGAP1 and Ubc9 (and not RanBP2 by itself) represents the physiologically relevant form of the SUMO ligase. Characterization of the interactions reveals an intricate proximity of two catalytic activities, sumoylation and RanGTP hydrolysis. In this ExtraView we summarize our results and discuss some ideas about a potential coupling of both processes.
机译:SUMO和RanGTP / GDP循环对蛋白质的翻译后修饰是直接或间接影响几乎每个细胞事件的两个基本细胞机制。已知SUMO E3连接酶RanBP2(Nup358)和Ran GTPase活化蛋白(RanGAP1)在整个细胞周期中形成稳定的复合物,表明蛋白的磺酰化与RanGTP水解之间存在联系。在最近的研究中,我们证明了RanBP2,Sumoylated RanGAP1和Ubc9的稳定复合物(而不是RanBP2本身)代表了SUMO连接酶的生理相关形式。相互作用的表征揭示了两个催化活性,磺酰化和RanGTP水解的复杂接近。在此ExtraView中,我们总结了结果并讨论了有关两个过程潜在耦合的一些想法。

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