改善孔道全貌：迈向核运输机制的共识
Improving the Hole Picture: Towards a Consensus on the Mechanism of Nuclear Transport
AI总结：
本文探讨了核孔复合体（NPC）中动态FG重复核孔蛋白在核质运输中的机制，指出新技术与先进建模将推动原子级动态描述，并助力理解NPC功能失调相关疾病。
摘要：
核孔复合体（NPCs）介导核质与细胞质之间的物质交换，在将核酸和蛋白质分隔到所需区室中发挥关键作用。NPC的静态结构已通过最近的冷冻电镜和其他研究得到相对清晰的界定。由于我们对高度动态蛋白质系统的理解有限，NPC孔道中动态成分的功能作用，即富含苯丙氨酸-甘氨酸（FG）重复序列的核孔蛋白，仍不太清楚。这些蛋白质形成一种受限浓缩物，与核运输因子（NTRs）相互作用并将其浓缩，以提供货物的促进性核质运输。FG重复序列与NTRs之间的极快速交换支持了极其快速的促进运输，接近细胞质中大分子扩散的速率，而没有特定相互作用的复合物则受到熵排斥，尽管关于运输机制和FG重复序列行为的几个方面的细节仍有待解决。然而，正如这里所讨论的，新技术方法与更先进建模方法的结合，可能会提供对NPC运输改进的动态描述，在不久的将来可能达到原子水平。这些进展可能对理解NPC功能失调在癌症、衰老、病毒疾病和神经退行性病变中所扮演的角色大有裨益。
英文摘要：
Nuclear pore complexes (NPCs) mediate the exchange of materials between the nucleoplasm and cytoplasm, playing a key role in the separation of nucleic acids and proteins into their required compartments. The static structure of the NPC is relatively well defined by recent cryo EM and other studies. The functional roles of dynamic components in the pore of the NPC, phenylalanyl-glycyl (FG) repeat rich nucleoporins, is less clear because of our limited understanding of highly dynamic protein systems. These proteins form a restrained concentrate which interacts with and concentrates nuclear transport factors (NTRs) to provide facilitated nucleocytoplasmic transport of cargoes. Very rapid exchange among FG repeats and NTRs supports extremely fast facilitated transport, close to the rate of macromolecular diffusion in cytoplasm, while complexes without specific interactions are entropically excluded, though details on several aspects of the transport mechanism and FG repeat behaviors remain to be resolved. However, as discussed here, new technical approaches combined with more advanced modeling methods will likely provide an improved dynamic description of NPC transport, potentially at the atomic level in the near future. Such advances are likely to be of major benefit in comprehending the roles the malfunctioning NPC plays in cancer, aging, viral diseases, and neurodegeneration.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
