4csa

Crystal structure of the asymmetric human metapneumovirus M2-1 tetramer bound to a DNA 4-mer

spinqualitylabelsall models 4csa, resolution 2.28Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4csa is a 5 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GOL, ZN Related: 4cs7, 4cs8, 4cs9 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed The M2-1 protein of human metapneumovirus (HMPV) is a zinc-binding transcription antiterminator which is highly conserved among pneumoviruses. We report the structure of tetrameric HMPV M2-1. Each protomer features a N-terminal zinc finger domain and an alpha-helical tetramerization motif forming a rigid unit, followed by a flexible linker and an alpha-helical core domain. The tetramer is asymmetric, three of the protomers exhibiting a closed conformation, and one an open conformation. Molecular dynamics simulations and SAXS demonstrate a dynamic equilibrium between open and closed conformations in solution. Structures of adenosine monophosphate- and DNA- bound M2-1 establish the role of the zinc finger domain in base-specific recognition of RNA. Binding to 'gene end' RNA sequences stabilized the closed conformation of M2-1 leading to a drastic shift in the conformational landscape of M2-1. We propose a model for recognition of gene end signals and discuss the implications of these findings for transcriptional regulation in pneumoviruses. Drastic changes in conformational dynamics of the antiterminator M2-1 regulate transcription efficiency in Pneumovirinae.,Leyrat C, Renner M, Harlos K, Huiskonen JT, Grimes JM Elife. 2014 May 19:e02674. doi: 10.7554/eLife.02674. PMID:24842877 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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