4H5L

Crystal Structure of Toscana Virus Nucleocapsid Protein Hexamer

4H5L の概要

• エントリーDOI: 10.2210/pdb4h5l/pdb
• 関連するPDBエントリー: 4H5M 4H5O 4H5P 4H5Q 4H6F 4H6G
• 分子名称: Nucleoprotein (2 entities in total)
• 機能のキーワード: nucleocapsid protein, n protein, ribonucleoprotein, viral nucleoprotein, rna binding, virus, rnp, viral protein
• 由来する生物種: Toscana virus (Tos)
• 細胞内の位置: Virion: P21701
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 166440.65

構造登録者

Raymond, D.D.,Smith, J.L. (登録日: 2012-09-18, 公開日: 2012-11-07, 最終更新日: 2023-09-20)

主引用文献

Raymond, D.D.,Piper, M.E.,Gerrard, S.R.,Skiniotis, G.,Smith, J.L.
Phleboviruses encapsidate their genomes by sequestering RNA bases.
Proc.Natl.Acad.Sci.USA, 109:19208-19213, 2012

PubMed Abstract: Rift Valley fever and Toscana viruses are human pathogens for which no effective therapeutics exist. These and other phleboviruses have segmented negative-sense RNA genomes that are sequestered by a nucleocapsid protein (N) to form ribonucleoprotein (RNP) complexes of irregular, asymmetric structure, previously uncharacterized at high resolution. N binds nonspecifically to single-stranded RNA with nanomolar affinity. Crystal structures of Rift Valley fever virus N-RNA complexes reconstituted with defined RNAs of different length capture tetrameric, pentameric and hexameric N-RNA multimers. All N-N subunit contacts are mediated by a highly flexible α-helical arm. Arm movement gives rise to the three multimers in the crystal structures and also explains the asymmetric architecture of the RNP. Despite the flexible association of subunits, the crystal structures reveal an invariant, monomeric RNP building block, consisting of the core of one N subunit, the arm of a neighboring N, and four RNA nucleotides with the flanking phosphates. Up to three additional RNA nucleotides bind between subunits. The monomeric building block is matched in size to the repeating unit in viral RNP, as visualized by electron microscopy. N sequesters four RNA bases in a narrow hydrophobic binding slot and has polar contacts only with the sugar-phosphate backbone, which faces the solvent. All RNA bases, whether in the binding slot or in the subunit interface, face the protein in a manner that is incompatible with base pairing or with "reading" by the viral polymerase.

PubMed: 23129612
DOI: 10.1073/pnas.1213553109

実験手法

X-RAY DIFFRACTION (2.75 Å)