m48S late-stage initiation complex, purified from rabbit reticulocytes lysates, displaying eIF2 ternary complex and eIF3 i and g subunits relocated to the intersubunit face
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複合体: m48S late-stage initiation complex, purified from rabbit reticulocytes lysates, displaying eIF2 ternary complex and eIF3 i and g subunits relocated to the intersubunit face
機能・相同性
機能・相同性情報
viral translational termination-reinitiation / eukaryotic translation initiation factor 3 complex, eIF3m / IRES-dependent viral translational initiation / eukaryotic translation initiation factor 3 complex / formation of cytoplasmic translation initiation complex / eukaryotic 43S preinitiation complex / eukaryotic 48S preinitiation complex / regulation of translational initiation / Formation of the ternary complex, and subsequently, the 43S complex / Ribosomal scanning and start codon recognition ...viral translational termination-reinitiation / eukaryotic translation initiation factor 3 complex, eIF3m / IRES-dependent viral translational initiation / eukaryotic translation initiation factor 3 complex / formation of cytoplasmic translation initiation complex / eukaryotic 43S preinitiation complex / eukaryotic 48S preinitiation complex / regulation of translational initiation / Formation of the ternary complex, and subsequently, the 43S complex / Ribosomal scanning and start codon recognition / Translation initiation complex formation / Formation of a pool of free 40S subunits / GTP hydrolysis and joining of the 60S ribosomal subunit / L13a-mediated translational silencing of Ceruloplasmin expression / translation initiation factor binding / translation initiation factor activity / translational initiation / cytoplasmic stress granule / molecular adaptor activity / synapse / RNA binding / extracellular exosome / cytosol 類似検索 - 分子機能
ジャーナル: Mol Cell / 年: 2016 タイトル: eIF3 Peripheral Subunits Rearrangement after mRNA Binding and Start-Codon Recognition. 著者: Angelita Simonetti / Jailson Brito Querido / Alexander G Myasnikov / Eder Mancera-Martinez / Adeline Renaud / Lauriane Kuhn / Yaser Hashem / 要旨: mRNA translation initiation in eukaryotes requires the cooperation of a dozen eukaryotic initiation factors (eIFs) forming several complexes, which leads to mRNA attachment to the small ribosomal ...mRNA translation initiation in eukaryotes requires the cooperation of a dozen eukaryotic initiation factors (eIFs) forming several complexes, which leads to mRNA attachment to the small ribosomal 40S subunit, mRNA scanning for start codon, and accommodation of initiator tRNA at the 40S P site. eIF3, composed of 13 subunits, 8 core (a, c, e, f, h, l, k, and m) and 5 peripheral (b, d, g, i, and j), plays a central role during this process. Here we report a cryo-electron microscopy structure of a mammalian 48S initiation complex at 5.8 Å resolution. It shows the relocation of subunits eIF3i and eIF3g to the 40S intersubunit face on the GTPase binding site, at a late stage in initiation. On the basis of a previous study, we demonstrate the relocation of eIF3b to the 40S intersubunit face, binding below the eIF2-Met-tRNAi(Met) ternary complex upon mRNA attachment. Our analysis reveals the deep rearrangement of eIF3 and unravels the molecular mechanism underlying eIF3 function in mRNA scanning and timing of ribosomal subunit joining.
全体 : m48S late-stage initiation complex, purified from rabbit reticulo...
全体
名称: m48S late-stage initiation complex, purified from rabbit reticulocytes lysates, displaying eIF2 ternary complex and eIF3 i and g subunits relocated to the intersubunit face
要素
複合体: m48S late-stage initiation complex, purified from rabbit reticulocytes lysates, displaying eIF2 ternary complex and eIF3 i and g subunits relocated to the intersubunit face
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超分子 #1: m48S late-stage initiation complex, purified from rabbit reticulo...
超分子
名称: m48S late-stage initiation complex, purified from rabbit reticulocytes lysates, displaying eIF2 ternary complex and eIF3 i and g subunits relocated to the intersubunit face タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#42
PDB-5k1h: eIF3b relocated to the intersubunit face to interact with eIF1 and below the eIF2 ternary-complex. from the structure of a partial yeast 48S preinitiation complex in closed conformation.