性腺刺激ホルモン放出ホルモン / 性腺刺激ホルモン放出ホルモン / 性腺刺激ホルモン放出ホルモン / Gonadotropin-releasing hormones signature. / Translation initiation factor IF-2, domain II / Initiation factor 2 signature. / Translation initiation factor IF-2, bacterial-like / Coiled-coil-helix-coiled-coil-helix domain-containing protein 1 / Translation initiation factor IF- 2, domain 3 / Translation-initiation factor 2 ...性腺刺激ホルモン放出ホルモン / 性腺刺激ホルモン放出ホルモン / 性腺刺激ホルモン放出ホルモン / Gonadotropin-releasing hormones signature. / Translation initiation factor IF-2, domain II / Initiation factor 2 signature. / Translation initiation factor IF-2, bacterial-like / Coiled-coil-helix-coiled-coil-helix domain-containing protein 1 / Translation initiation factor IF- 2, domain 3 / Translation-initiation factor 2 / Translation initiation factor IF- 2 / Translation initiation factor IF-2, domain 3 superfamily / Cysteine alpha-hairpin motif superfamily / 28S ribosomal protein S27, mitochondrial / MRPS27/PTCD2 / Mitochondrial 28S ribosomal protein S27 / Ribosomal protein S22, mitochondrial / Ribosomal protein S23, mitochondrial / Ribosomal protein S23/S25, mitochondrial / Mitochondrial 28S ribosomal protein S22 / Mitochondrial ribosomal protein S23 / Ribosomal protein S29, mitochondrial / Ribosomal protein S28, mitochondrial / 28S ribosomal protein S10, mitochondrial / Mitochondrial ribosomal protein MRP-S35 / 28S ribosomal protein S24, mitochondrial / Mitochondrial 28S ribosomal protein S34 / Pentatricopeptide repeat domain-containing protein 3 / 28S ribosomal protein S17, mitochondrial / 28S ribosomal protein S18b, mitochondrial / : / Mitochondrial ribosome subunit S24 / Mitochondrial 28S ribosomal protein S34 / Small ribosomal subunit protein uS5m, N-terminal / 28S ribosomal protein S25, mitochondrial / Pentatricopeptide repeat domain / Ribosomal protein S27/S33, mitochondrial / Ribosomal protein S24/S35, mitochondrial / Mitochondrial ribosomal subunit S27 / Ribosomal protein S24/S35, mitochondrial, conserved domain / Mitochondrial ribosomal subunit protein / Ribosomal protein S23/S29, mitochondrial / Mitochondrial ribosomal death-associated protein 3 / Pentatricopeptide repeat / Mitochondrial mRNA-processing protein COX24, C-terminal / Mitochondrial mRNA-processing protein COX24, C-terminal / Mitochondrial domain of unknown function (DUF1713) / CHCH / CHCH domain / Ribosomal protein/NADH dehydrogenase domain / Mitochondrial ribosomal protein L51 / S25 / CI-B8 domain / Mitochondrial ribosomal protein L51 / S25 / CI-B8 domain / Ribosomal protein S21 superfamily / Ribosomal protein S21 / Translational (tr)-type GTP-binding domain / Elongation factor Tu GTP binding domain / Translational (tr)-type guanine nucleotide-binding (G) domain profile. / Ribosomal protein S21 / Ribosomal protein S2, bacteria/mitochondria/plastid / Ribosomal protein S18, conserved site / Ribosomal protein S18 signature. / Ribosomal protein L19 / Ribosomal protein L19 superfamily / Ribosomal protein L19 / Ribosomal protein S6 / Ribosomal protein S6 / Ribosomal protein S6 superfamily / Ribosomal protein S12, bacterial-type / Translation elongation factor EF1B/ribosomal protein S6 / Ribosomal protein S18 / Ribosomal protein S18 / Ribosomal protein S18 superfamily / Ribosomal protein S2 signature 1. / Ribosomal protein S2, conserved site / Ribosomal protein S2 / Ribosomal protein S2, flavodoxin-like domain superfamily / Ribosomal protein S2 / Ribosomal protein S5, N-terminal, conserved site / Ribosomal protein S5 signature. / Ribosomal protein S5 / Ribosomal protein S5, N-terminal / S5 double stranded RNA-binding domain profile. / Ribosomal protein S5, C-terminal / Ribosomal protein S5, N-terminal domain / Ribosomal protein S5, C-terminal domain / Ribosomal protein S14 / Ribosomal protein S14p/S29e / Ribosomal S11, conserved site / Ribosomal protein S12/S23 / Ribosomal protein S11 / Ribosomal protein S12/S23 / Ribosomal protein S11 / Ribosomal protein S11 signature. / Ribosomal protein S10p/S20e / Ribosomal protein S10 domain / Ribosomal protein S10 domain superfamily / Ribosomal protein S10p/S20e / Ribosomal protein S9, conserved site / Ribosomal protein S9 signature. / Ribosomal protein S5/S7 類似検索 - ドメイン・相同性
Small ribosomal subunit protein uS12m / 28S ribosomal protein S14, mitochondrial / 28S ribosomal protein S18c, mitochondrial isoform 1 / Small ribosomal subunit protein mS25 / 28S ribosomal protein S28, mitochondrial / Small ribosomal subunit protein uS7m / Mitochondrial ribosomal protein S11 / 28S ribosomal protein S21, mitochondrial / Mitochondrial ribosomal protein S23 / 28S ribosomal protein S24, mitochondrial ...Small ribosomal subunit protein uS12m / 28S ribosomal protein S14, mitochondrial / 28S ribosomal protein S18c, mitochondrial isoform 1 / Small ribosomal subunit protein mS25 / 28S ribosomal protein S28, mitochondrial / Small ribosomal subunit protein uS7m / Mitochondrial ribosomal protein S11 / 28S ribosomal protein S21, mitochondrial / Mitochondrial ribosomal protein S23 / 28S ribosomal protein S24, mitochondrial / Mitochondrial ribosomal protein S22 / Progonadoliberin / Small ribosomal subunit protein mS38 / Small ribosomal subunit protein uS15m / Uncharacterized protein / Mitochondrial ribosomal protein S17 / Small ribosomal subunit protein uS10m / 28S ribosomal protein S2, mitochondrial / Small ribosomal subunit protein mS33 / 28S ribosomal protein S35, mitochondrial isoform 1 / Coiled-coil-helix-coiled-coil-helix domain containing 1 / Small ribosomal subunit protein uS5m / Mitochondrial ribosomal protein S6 / Mitochondrial ribosomal protein S27 / Large ribosomal subunit protein bL19m / Small ribosomal subunit protein mS29 / 28S ribosomal protein S9, mitochondrial / Small ribosomal subunit protein mS39 / Translation initiation factor IF-2, mitochondrial / Small ribosomal subunit protein mS40 類似検索 - 構成要素
ジャーナル: Nature / 年: 2018 タイトル: Unique features of mammalian mitochondrial translation initiation revealed by cryo-EM. 著者: Eva Kummer / Marc Leibundgut / Oliver Rackham / Richard G Lee / Daniel Boehringer / Aleksandra Filipovska / Nenad Ban / 要旨: Mitochondria maintain their own specialized protein synthesis machinery, which in mammals is used exclusively for the synthesis of the membrane proteins responsible for oxidative phosphorylation. The ...Mitochondria maintain their own specialized protein synthesis machinery, which in mammals is used exclusively for the synthesis of the membrane proteins responsible for oxidative phosphorylation. The initiation of protein synthesis in mitochondria differs substantially from bacterial or cytosolic translation systems. Mitochondrial translation initiation lacks initiation factor 1, which is essential in all other translation systems from bacteria to mammals. Furthermore, only one type of methionyl transfer RNA (tRNA) is used for both initiation and elongation, necessitating that the initiation factor specifically recognizes the formylated version of tRNA (fMet-tRNA). Lastly, most mitochondrial mRNAs do not possess 5' leader sequences to promote mRNA binding to the ribosome. There is currently little mechanistic insight into mammalian mitochondrial translation initiation, and it is not clear how mRNA engagement, initiator-tRNA recruitment and start-codon selection occur. Here we determine the cryo-EM structure of the complete translation initiation complex from mammalian mitochondria at 3.2 Å. We describe the function of an additional domain insertion that is present in the mammalian mitochondrial initiation factor 2 (mtIF2). By closing the decoding centre, this insertion stabilizes the binding of leaderless mRNAs and induces conformational changes in the rRNA nucleotides involved in decoding. We identify unique features of mtIF2 that are required for specific recognition of fMet-tRNA and regulation of its GTPase activity. Finally, we observe that the ribosomal tunnel in the initiating ribosome is blocked by insertion of the N-terminal portion of mitochondrial protein mL45, which becomes exposed as the ribosome switches to elongation mode and may have an additional role in targeting of mitochondrial ribosomes to the protein-conducting pore in the inner mitochondrial membrane.
名称: Mitochondrial ribosomal protein L19 / タイプ: protein_or_peptide / ID: 2 詳細: Unassigned residues have been built as poly-alanine. コピー数: 1 / 光学異性体: LEVO
名称: unassigned secondary structure elements / タイプ: protein_or_peptide / ID: 21 詳細: Unassigned secondary structure elements have been built as poly-alanine. コピー数: 1 / 光学異性体: LEVO
名称: Mitochondrial ribosomal protein S27 / タイプ: protein_or_peptide / ID: 26 詳細: Unassigned residues have been built as poly-alanine. コピー数: 1 / 光学異性体: LEVO
名称: Mitochondrial ribosomal protein S39 / タイプ: protein_or_peptide / ID: 35 詳細: Unassigned residues have been built as poly-alanine. コピー数: 1 / 光学異性体: LEVO
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gonadotropin-releasing hormone receptor binding / gonadotropin hormone-releasing hormone activity / G alpha (q) signalling events / Mitochondrial translation elongation / Mitochondrial translation termination / mitochondrial translational initiation / : / translation factor activity, RNA binding / 
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emd_4369.png
http://ftp.pdbj.org/pub/emdb/structures/EMD-4369
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