- PDB-3izz: Models for ribosome components that are nearest neighbors to the ... -
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基本情報
登録情報
データベース: PDB / ID: 3izz
タイトル
Models for ribosome components that are nearest neighbors to the bovine mitochondrial initiation factor2 bound to the E. Coli ribosome
要素
Helix 18 (Small Subunit)
Helix 44 (Small Subunit)
Helix 5, 14, 15 (Small Subunit)
Helix 69, 71, 89, 92, 95 (Large Subunit)
Protein L14 (Large Subunit)
Protein S12 (Small Subunit)
キーワード
RNA / RIBOSOMAL PROTEIN / 70S
機能・相同性
機能・相同性情報
large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / structural constituent of ribosome / cytosol / cytoplasm 類似検索 - 分子機能
Ribosomal protein L14P, bacterial-type / Ribosomal protein L14P, conserved site / Ribosomal protein L14 signature. / Ribosomal protein L14p/L23e / Ribosomal protein L14P / Ribosomal protein L14 superfamily / Ribosomal protein L14p/L23e 類似検索 - ドメイン・相同性
RNA / RNA (> 10) / RNA (> 100) / Large ribosomal subunit protein uL14 類似検索 - 構成要素
ジャーナル: Proc Natl Acad Sci U S A / 年: 2011 タイトル: Insertion domain within mammalian mitochondrial translation initiation factor 2 serves the role of eubacterial initiation factor 1. 著者: Aymen S Yassin / Md Emdadul Haque / Partha P Datta / Kevin Elmore / Nilesh K Banavali / Linda L Spremulli / Rajendra K Agrawal / 要旨: Mitochondria have their own translational machineries for the synthesis of thirteen polypeptide chains that are components of the complexes that participate in the process of oxidative ...Mitochondria have their own translational machineries for the synthesis of thirteen polypeptide chains that are components of the complexes that participate in the process of oxidative phosphorylation (or ATP generation). Translation initiation in mammalian mitochondria requires two initiation factors, IF2(mt) and IF3(mt), instead of the three that are present in eubacteria. The mammalian IF2(mt) possesses a unique 37 amino acid insertion domain, which is known to be important for the formation of the translation initiation complex. We have obtained a three-dimensional cryoelectron microscopic map of the mammalian IF2(mt) in complex with initiator fMet-tRNA(iMet) and the eubacterial ribosome. We find that the 37 amino acid insertion domain interacts with the same binding site on the ribosome that would be occupied by the eubacterial initiation factor IF1, which is absent in mitochondria. Our finding suggests that the insertion domain of IF2(mt) mimics the function of eubacterial IF1, by blocking the ribosomal aminoacyl-tRNA binding site (A site) at the initiation step.
CHAIN A IS MADE UP OF THREE HELICES (5,14, AND 15) OF SMALL SUBUNIT RNA AND CHAIN B IS COMPOSED OF ...CHAIN A IS MADE UP OF THREE HELICES (5,14, AND 15) OF SMALL SUBUNIT RNA AND CHAIN B IS COMPOSED OF HELICES 69, 71, 89, 92, AND 95 OF LARGE SUBUNIT RIBOSOME.
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実験情報
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実験
実験
手法: 電子顕微鏡法
EM実験
試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法
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試料調製
構成要素
名称: E. coli 70S / タイプ: RIBOSOME
緩衝液
pH: 7.6
試料
包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES
急速凍結
装置: FEI VITROBOT MARK I / 凍結剤: ETHANE / 詳細: Vitrobot