4u54 | pdb_00004u54

IMPORTIN-ALPHA MINOR NLS SITE INHIBITOR

spinqualitylabelsall models 4u54, resolution 2.41Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4u54 is a 1 chain structure with sequence from Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.41Å Ligands: 3C5 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function IMA1_MOUSE Functions in nuclear protein import as an adapter protein for nuclear receptor KPNB1. Binds specifically and directly to substrates containing either a simple or bipartite NLS motif. Docking of the importin/substrate complex to the nuclear pore complex (NPC) is mediated by KPNB1 through binding to nucleoporin FxFG repeats and the complex is subsequently translocated through the pore by an energy requiring, Ran-dependent mechanism. At the nucleoplasmic side of the NPC, Ran binds to importin-beta and the three components separate and importin-alpha and -beta are re-exported from the nucleus to the cytoplasm where GTP hydrolysis releases Ran from importin. The directionality of nuclear import is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus. Publication Abstract from PubMed Protein-protein interactions are difficult therapeutic targets, and inhibiting pathologically relevant interactions without disrupting other essential ones presents an additional challenge. Herein we report how this might be achieved for the potential anticancer target, the TPX2-importin-alpha interaction. Importin-alpha is a nuclear transport protein that regulates the spindle assembly protein TPX2. It has two binding sites-major and minor-to which partners bind. Most nuclear transport cargoes use the major site, whereas TPX2 binds principally to the minor site. Fragment-based approaches were used to identify small molecules that bind importin-alpha, and crystallographic studies identified a lead series that was observed to bind specifically to the minor site, representing the first ligands specific for this site. Structure-guided synthesis informed the elaboration of these fragments to explore the source of ligand selectivity between the minor and major sites. These ligands are starting points for the development of inhibitors of this protein-protein interaction. Selective Targeting of the TPX2 Site of Importin-alpha Using Fragment-Based Ligand Design.,Holvey RS, Valkov E, Neal D, Stewart M, Abell C ChemMedChem. 2015 Apr 20. doi: 10.1002/cmdc.201500014. PMID:25899172 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Importin 3D structures

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