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Mechanisms of tumor suppression by the SCF(Fbw7).

机译:SCF(Fbw7)抑制肿瘤的机制。

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摘要

SCF ubiquitin ligases regulate the degradation of many proteins involved in the control of cell division and growth. F-box proteins are the SCF components that bind to substrates, and this binding is usually signaled by substrate phosphorylation. The Fbw7/hCdc4 F-box protein was first recognized by its ability to bind cyclin E, and the SCF (Fbw7) is now known to target c-Myc, c-Jun and Notch for degradation in addition to its role in cyclin E proteolysis. Fbw7 thus negatively regulates several key oncoproteins. Accordingly, Fbw7 is a tumor suppressor that is mutated in a wide spectrum of human cancers, and Fbw7 functions as a haploin sufficient tumor suppressor in mice. Because there are three Fbw7 isoforms that reside in different subcellular compartments, as well as multiple Fbw7 substrates that are the products of proto-oncogenes, the mechanisms of tumor suppression by Fbw7 are complex and incompletely understood. In this review we discuss the activities of the SCF(Fbw7) in the context of its role as a tumor suppressor and highlight recent findings demonstrating that dominant oncogenes disable Fbw7 function.
机译:SCF泛素连接酶调节许多参与细胞分裂和生长控制的蛋白质的降解。 F-box蛋白是与底物结合的SCF成分,这种结合通常通过底物的磷酸化来发出信号。 Fbw7 / hCdc4 F-box蛋白首先通过其结合细胞周期蛋白E的能力而被认可,并且现在已知SCF(Fbw7)除了在细胞周期蛋白E蛋白水解中的作用外,还靶向降解c-Myc,c-Jun和Notch。 。因此,Fbw7负调控几种关键癌蛋白。因此,Fbw7是在多种人类癌症中突变的肿瘤抑制剂,并且Fbw7在小鼠中作为单倍蛋白足够的肿瘤抑制剂起作用。由于存在于不同亚细胞区室中的三种Fbw7同工型,以及作为原癌基因产物的多个Fbw7底物,因此Fbw7抑制肿瘤的机制是复杂且不完整的。在这篇综述中,我们讨论了SCF(Fbw7)在其作为肿瘤抑制因子的作用下的活性,并着重强调了最近的发现,证明了主要的致癌基因禁用了Fbw7的功能。

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