ジャーナル: J Mol Biol / 年: 2010 タイトル: Structure of a conserved retroviral RNA packaging element by NMR spectroscopy and cryo-electron tomography. 著者: Yasuyuki Miyazaki / Rossitza N Irobalieva / Blanton S Tolbert / Adjoa Smalls-Mantey / Kilali Iyalla / Kelsey Loeliger / Victoria D'Souza / Htet Khant / Michael F Schmid / Eric L Garcia / ...著者: Yasuyuki Miyazaki / Rossitza N Irobalieva / Blanton S Tolbert / Adjoa Smalls-Mantey / Kilali Iyalla / Kelsey Loeliger / Victoria D'Souza / Htet Khant / Michael F Schmid / Eric L Garcia / Alice Telesnitsky / Wah Chiu / Michael F Summers / 要旨: The 5'-untranslated regions of all gammaretroviruses contain a conserved "double-hairpin motif" (Ψ(CD)) that is required for genome packaging. Both hairpins (SL-C and SL-D) contain GACG tetraloops ...The 5'-untranslated regions of all gammaretroviruses contain a conserved "double-hairpin motif" (Ψ(CD)) that is required for genome packaging. Both hairpins (SL-C and SL-D) contain GACG tetraloops that, in isolated RNAs, are capable of forming "kissing" interactions stabilized by two intermolecular G-C base pairs. We have determined the three-dimensional structure of the double hairpin from the Moloney murine leukemia virus ([Ψ(CD)](2), 132 nt, 42.8 kDa) using a (2)H-edited NMR-spectroscopy-based approach. This approach enabled the detection of (1)H-(1)H dipolar interactions that were not observed in previous studies of isolated SL-C and SL-D hairpin RNAs using traditional (1)H-(1)H correlated and (1)H-(13)C-edited NMR methods. The hairpins participate in intermolecular cross-kissing interactions (SL-C to SL-D' and SLC' to SL-D) and stack in an end-to-end manner (SL-C to SL-D and SL-C' to SL-D') that gives rise to an elongated overall shape (ca 95 Å×45 Å×25 Å). The global structure was confirmed by cryo-electron tomography (cryo-ET), making [Ψ(CD)](2) simultaneously the smallest RNA to be structurally characterized to date by cryo-ET and among the largest to be determined by NMR. Our findings suggest that, in addition to promoting dimerization, [Ψ(CD)](2) functions as a scaffold that helps initiate virus assembly by exposing a cluster of conserved UCUG elements for binding to the cognate nucleocapsid domains of assembling viral Gag proteins.
名称: MLV Tandem Hairpin RNA / タイプ: sample / ID: 1000 詳細: RNA synthesized by in vitro transcription and purified by polyacrylamide gel electrophoresis. Sequence of the RNA confirmed by NMR. 集合状態: Homodimer / Number unique components: 1
分子量
理論値: 42.8 KDa / 手法: Not determined but identity confirmed by NMR
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分子 #1: MLV Tandem Hairpin RNA
分子
名称: MLV Tandem Hairpin RNA / タイプ: rna / ID: 1 / Name.synonym: MLV Tandem Hairpin RNA / 分類: OTHER / Structure: SINGLE STRANDED / Synthetic?: No
Protocol: Distance geometry refinement with the Cyana software package using NMR-derived restraints. The cryo-ET data were not employed as refinement restraints. The determined NMR structure (2LIF) was fitted into the cryo-ET density map using Chimera and X-plor.
精密化
空間: REAL 当てはまり具合の基準: Lowest target functions, equals sum of the square of the distance and angle restraint violations