Mechanisms of receptor-mediated nuclear import and nuclear export - PubMed (original) (raw)

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Mechanisms of receptor-mediated nuclear import and nuclear export

Lucy F Pemberton et al. Traffic. 2005 Mar.

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Abstract

Nuclear transport of proteins and RNA occurs through the nuclear pore complex and is mediated by a superfamily of transport receptors known collectively as karyopherins. Karyopherins bind to their cargoes by recognition of specific nuclear localization signals or nuclear export signals. Transport through the nuclear pore complex is facilitated by transient interactions between the karyopherins and the nuclear pore complex. The interactions of karyopherins with their cargoes are regulated by the Ras-related GTPase Ran. Ran is assisted in this process by proteins that regulate its GTPase cycle and subcellular localization. In this review, we describe several of the major transport pathways that are conserved in higher and lower eukaryotes, with particular emphasis on the role of Ran. We highlight the latest advances in the structure and function of transport receptors and discuss recent examples of steroid hormone receptor import and regulation by signal transduction pathways. Understanding the molecular basis of nuclear transport may provide insight into human diseases by revealing how nucleocytoplasmic trafficking regulates protein activity.

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