5yu6 | pdb_00005yu6

CRYSTAL STRUCTURE OF EXPORTIN-5:RANGTP COMPLEX

spinqualitylabelsall models 5yu6, resolution 3.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5yu6 is a 6 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GTP, MG NonStd Res: UNK Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [XPO5_HUMAN] Mediates the nuclear export of proteins bearing a double-stranded RNA binding domain (dsRBD) and double-stranded RNAs (cargos). XPO5 in the nucleus binds cooperatively to the RNA and to the GTPase Ran in its active GTP-bound form. Proteins containing dsRBDs can associate with this trimeric complex through the RNA. Docking of this complex to the nuclear pore complex (NPC) is mediated through binding to nucleoporins. Upon transit of a nuclear export complex into the cytoplasm, hydrolysis of Ran-GTP to Ran-GDP (induced by RANBP1 and RANGAP1, respectively) cause disassembly of the complex and release of the cargo from the export receptor. XPO5 then returns to the nuclear compartment by diffusion through the nuclear pore complex, to mediate another round of transport. The directionality of nuclear export is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus. Overexpression may in some circumstances enhance RNA-mediated gene silencing (RNAi). Mediates nuclear export of isoform 5 of ADAR/ADAR1 in a RanGTP-dependent manner. Mediates the nuclear export of micro-RNA precursors, which form short hairpins. Also mediates the nuclear export of synthetic short hairpin RNAs used for RNA interference, and adenovirus VA1 dsRNA. In some circumstances can also mediate the nuclear export of deacylated and aminoacylated tRNAs. Specifically recognizes dsRNAs that lack a 5'-overhang in a sequence-independent manner, have only a short 3'-overhang, and that have a double-stranded length of at least 15 base-pairs. Binding is dependent on Ran-GTP. [RAN_CANLF] GTPase involved in nucleocytoplasmic transport, participating both to the import and the export from the nucleus of proteins and RNAs. Switches between a cytoplasmic GDP- and a nuclear GTP-bound state by nucleotide exchange and GTP hydrolysis. Nuclear import receptors such as importin beta bind their substrates only in the absence of GTP-bound RAN and release them upon direct interaction with GTP-bound RAN, while export receptors behave in the opposite way. Thereby, RAN controls cargo loading and release by transport receptors in the proper compartment and ensures the directionality of the transport. Interaction with RANBP1 induces a conformation change in the complex formed by XPO1 and RAN that triggers the release of the nuclear export signal of cargo proteins. RAN (GTP-bound form) triggers microtubule assembly at mitotic chromosomes and is required for normal mitotic spindle assembly and chromosome segregation. Required for normal progress through mitosis. The complex with BIRC5/survivin plays a role in mitotic spindle formation by serving as a physical scaffold to help deliver the RAN effector molecule TPX2 to microtubules. Acts as a negative regulator of the kinase activity of VRK1 and VRK2. Enhances AR-mediated transactivation.[UniProtKB:P62826] Publication Abstract from PubMed In the nucleus, RanGTP binding to importin dissociates the cargo. On the other hand, RanGTP enables exportin to bind export cargo and form the export complex by each exportin's own cargo selection mechanism. Here, we present two X-ray structures for Exportin-5 (Exp-5) alone and Exp-5:RanGTP intermediate complex. The structure of Exp-5 adopts a ring-shaped closed conformation by C-terminal anchor residues 1,167-1,179, interacting with N-terminal heat repeats 4-9. The closed form of Exp-5 is important for the stability of the cargo-free state. Interaction between Exp-5 and RanGTP induces elimination of intramolecular contacts of the C-terminal anchor. A large movement of N-terminal 1-9th heat repeats and C-terminal 19-20th heat repeats creates an open space for RanGTP accommodation. Exp-5 in Exp-5:RanGTP and Exp-5:RanGTP:pre-miRNA adopts the same conformation. RanGTP binding to Exp-5 creates a selective molecular cage area for accepting its cargoes, such as small double-stranded RNAs, without conformational change in Exp-5:RanGTP. Structural Basis for Selective Binding of Export Cargoes by Exportin-5.,Yamazawa R, Jiko C, Choi S, Park IY, Nakagawa A, Yamashita E, Lee SJ Structure. 2018 Jul 16. pii: S0969-2126(18)30246-6. doi:, 10.1016/j.str.2018.06.014. PMID:30100359 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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