- PDB-4hzk: Crystal structure of free CRM1 (crystal form 2) -
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基本情報
登録情報
データベース: PDB / ID: 4hzk
タイトル
Crystal structure of free CRM1 (crystal form 2)
要素
CRM1 Nuclear transport receptor
キーワード
TRANSPORT PROTEIN / HEAT repeat protein / Nuclear export receptor
機能・相同性
機能・相同性情報
nuclear export signal receptor activity / tRNA processing / ribosomal large subunit export from nucleus / ribosomal small subunit export from nucleus / protein export from nucleus / nucleus / cytoplasm 類似検索 - 分子機能
Exportin-1, repeat 3 / Chromosome region maintenance repeat / Exportin-1, repeat 2 / Chromosome region maintenance or exportin repeat / CRM1 / Exportin repeat 2 / CRM1 / Exportin repeat 3 / CRM1 C terminal / Exportin-1, C-terminal / CRM1 C terminal / Exportin-1/5 ...Exportin-1, repeat 3 / Chromosome region maintenance repeat / Exportin-1, repeat 2 / Chromosome region maintenance or exportin repeat / CRM1 / Exportin repeat 2 / CRM1 / Exportin repeat 3 / CRM1 C terminal / Exportin-1, C-terminal / CRM1 C terminal / Exportin-1/5 / Exportin-1/Importin-beta-like / Exportin 1-like protein / Armadillo-like helical / Armadillo-type fold 類似検索 - ドメイン・相同性
Exportin-1 C-terminal domain-containing protein 類似検索 - 構成要素
ジャーナル: Proc Natl Acad Sci U S A / 年: 2013 タイトル: Structural basis for cooperativity of CRM1 export complex formation. 著者: Thomas Monecke / David Haselbach / Béla Voß / Andreas Russek / Piotr Neumann / Emma Thomson / Ed Hurt / Ulrich Zachariae / Holger Stark / Helmut Grubmüller / Achim Dickmanns / Ralf Ficner / 要旨: In eukaryotes, the nucleocytoplasmic transport of macromolecules is mainly mediated by soluble nuclear transport receptors of the karyopherin-β superfamily termed importins and exportins. The highly ...In eukaryotes, the nucleocytoplasmic transport of macromolecules is mainly mediated by soluble nuclear transport receptors of the karyopherin-β superfamily termed importins and exportins. The highly versatile exportin chromosome region maintenance 1 (CRM1) is essential for nuclear depletion of numerous structurally and functionally unrelated protein and ribonucleoprotein cargoes. CRM1 has been shown to adopt a toroidal structure in several functional transport complexes and was thought to maintain this conformation throughout the entire nucleocytoplasmic transport cycle. We solved crystal structures of free CRM1 from the thermophilic eukaryote Chaetomium thermophilum. Surprisingly, unbound CRM1 exhibits an overall extended and pitched superhelical conformation. The two regulatory regions, namely the acidic loop and the C-terminal α-helix, are dramatically repositioned in free CRM1 in comparison with the ternary CRM1-Ran-Snurportin1 export complex. Single-particle EM analysis demonstrates that, in a noncrystalline environment, free CRM1 exists in equilibrium between extended, superhelical and compact, ring-like conformations. Molecular dynamics simulations show that the C-terminal helix plays an important role in regulating the transition from an extended to a compact conformation and reveal how the binding site for nuclear export signals of cargoes is modulated by different CRM1 conformations. Combining these results, we propose a model for the cooperativity of CRM1 export complex assembly involving the long-range allosteric communication between the distant binding sites of GTP-bound Ran and cargo.
THE AUTHORS STATE THAT THESE RESIDUES ARE WRONGLY ASSIGNED INTRONS IN THE CHAETOMIUM THERMOPHILUM ...THE AUTHORS STATE THAT THESE RESIDUES ARE WRONGLY ASSIGNED INTRONS IN THE CHAETOMIUM THERMOPHILUM VAR. THERMOPHILUM DSM1495 CRM1 SEQUENCE. MULTIPLE SEQUENCE ALIGNMENTS WITH SEQUENCES FROM MORE THAN 10 SPECIES SHOWED, THAT THESE TWO INTRONS, THAT HAVE BEEN ASSIGNED, EXACTLY CORRESPOND TO A PROTEIN SEQUENCE, WHICH IS PRESENT AND CONSERVED IN ALL OTHER CRM1 SPECIES. IN ADDITION, ISOLATION OF THE CRM1 GENE OUT OF A CHAETOMIUM THERMOPHILUM CDNA LIBRARY WITH APPROPRIATE PRIMERS AMPLIFIED THE GENE INCLUDING THE WRONGLY ASSIGNED INTRONS.
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実験情報
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実験
実験
手法: X線回折 / 使用した結晶の数: 1
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試料調製
結晶
マシュー密度: 2.95 Å3/Da / 溶媒含有率: 58.36 %
結晶化
温度: 293 K / 手法: 蒸気拡散法, シッティングドロップ法 / pH: 9 詳細: 22% Polyacrylic acid 5,100, 20 mM MgCl2, 100 mM CHES 9.0, VAPOR DIFFUSION, SITTING DROP, temperature 293K