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基本情報
登録情報 | データベース: PDB / ID: 1x18 | ||||||
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タイトル | Contact sites of ERA GTPase on the THERMUS THERMOPHILUS 30S SUBUNIT | ||||||
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![]() | STRUCTURAL PROTEIN/RNA / Contact sites of Era protein on the 30S ribosomal subunit / STRUCTURAL PROTEIN-RNA COMPLEX | ||||||
機能・相同性 | ![]() small ribosomal subunit / cytosolic small ribosomal subunit / small ribosomal subunit rRNA binding / tRNA binding / rRNA binding / ribosome / structural constituent of ribosome / translation / ribonucleoprotein complex 類似検索 - 分子機能 | ||||||
生物種 | ![]() ![]() | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 13.5 Å | ||||||
![]() | Sharma, M.R. / Barat, C. / Agrawal, R.K. | ||||||
![]() | ![]() タイトル: Interaction of Era with the 30S ribosomal subunit implications for 30S subunit assembly. 著者: Manjuli R Sharma / Chandana Barat / Daniel N Wilson / Timothy M Booth / Masahito Kawazoe / Chie Hori-Takemoto / Mikako Shirouzu / Shigeyuki Yokoyama / Paola Fucini / Rajendra K Agrawal / ![]() 要旨: Era (E. coliRas-like protein) is a highly conserved and essential GTPase in bacteria. It binds to the 16S ribosomal RNA (rRNA) of the small (30S) ribosomal subunit, and its depletion leads to ...Era (E. coliRas-like protein) is a highly conserved and essential GTPase in bacteria. It binds to the 16S ribosomal RNA (rRNA) of the small (30S) ribosomal subunit, and its depletion leads to accumulation of an unprocessed precursor of the 16S rRNA. We have obtained a three-dimensional cryo-electron microscopic map of the Thermus thermophilus 30S-Era complex. Era binds in the cleft between the head and platform of the 30S subunit and locks the subunit in a conformation that is not favorable for association with the large (50S) ribosomal subunit. The RNA binding KH motif present within the C-terminal domain of Era interacts with the conserved nucleotides in the 3' region of the 16S rRNA. Furthermore, Era makes contact with several assembly elements of the 30S subunit. These observations suggest a direct involvement of Era in the assembly and maturation of the 30S subunit. #1: ![]() タイトル: Structure of the 30S ribosomal subunit. 著者: B T Wimberly / D E Brodersen / W M Clemons / R J Morgan-Warren / A P Carter / C Vonrhein / T Hartsch / V Ramakrishnan / ![]() 要旨: Genetic information encoded in messenger RNA is translated into protein by the ribosome, which is a large nucleoprotein complex comprising two subunits, denoted 30S and 50S in bacteria. Here we ...Genetic information encoded in messenger RNA is translated into protein by the ribosome, which is a large nucleoprotein complex comprising two subunits, denoted 30S and 50S in bacteria. Here we report the crystal structure of the 30S subunit from Thermus thermophilus, refined to 3 A resolution. The final atomic model rationalizes over four decades of biochemical data on the ribosome, and provides a wealth of information about RNA and protein structure, protein-RNA interactions and ribosome assembly. It is also a structural basis for analysis of the functions of the 30S subunit, such as decoding, and for understanding the action of antibiotics. The structure will facilitate the interpretation in molecular terms of lower resolution structural data on several functional states of the ribosome from electron microscopy and crystallography. #2: ![]() タイトル: Crystal structure of ERA: a GTPase-dependent cell cycle regulator containing an RNA binding motif. 著者: X Chen / D L Court / X Ji / ![]() 要旨: ERA forms a unique family of GTPase. It is widely conserved and essential in bacteria. ERA functions in cell cycle control by coupling cell division with growth rate. ERA homologues also are found in ...ERA forms a unique family of GTPase. It is widely conserved and essential in bacteria. ERA functions in cell cycle control by coupling cell division with growth rate. ERA homologues also are found in eukaryotes. Here we report the crystal structure of ERA from Escherichia coli. The structure has been determined at 2.4-A resolution. It reveals a two-domain arrangement of the molecule: an N-terminal domain that resembles p21 Ras and a C-terminal domain that is unique. Structure-based topological search of the C domain fails to reveal any meaningful match, although sequence analysis suggests that it contains a KH domain. KH domains are RNA binding motifs that usually occur in tandem repeats and exhibit low sequence similarity except for the well-conserved segment VIGxxGxxIK. We have identified a betaalphaalphabeta fold that contains the VIGxxGxxIK sequence and is shared by the C domain of ERA and the KH domain. We propose that this betaalphaalphabeta fold is the RNA binding motif, the minimum structural requirement for RNA binding. ERA dimerizes in crystal. The dimer formation involves a significantly distorted switch II region, which may shed light on how ERA protein regulates downstream events. #3: ![]() タイトル: Crystal structure of Era from Thermus thermophilus 著者: Kawazoe, M. / Takemoto, C. / Kaminishi, T. / Sekine, S. / Shirouzu, M. / Fucini, P. / Agrawal, R.K. / Yokoyama, S. | ||||||
履歴 |
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構造の表示
ムービー |
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構造ビューア | 分子: ![]() ![]() |
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-関連構造データ
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リンク
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集合体
登録構造単位 | ![]()
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要素
-RNA鎖 , 4種, 4分子 ABCD
#1: RNA鎖 | 分子量: 3585.218 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
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#2: RNA鎖 | 分子量: 9974.926 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
#3: RNA鎖 | 分子量: 6381.822 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
#4: RNA鎖 | 分子量: 7725.621 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
-30S ribosomal protein ... , 4種, 4分子 EFGH
#5: タンパク質 | 分子量: 26671.881 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
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#6: タンパク質 | 分子量: 17822.660 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
#7: タンパク質 | 分子量: 12606.369 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
#8: タンパク質 | 分子量: 8483.172 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
-タンパク質 , 1種, 1分子 X
#9: タンパク質 | 分子量: 32863.969 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() プラスミド: pET11b / 発現宿主: ![]() ![]() |
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-詳細
配列の詳細 | The EM map on chain X, protein ERA, was obtained from Thermus thermophilus, but the coordinates ...The EM map on chain X, protein ERA, was obtained from Thermus thermophilus, but the coordinates were modeled based on Escherichia coli sequence. |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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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: THERMUS THERMOPHILUS 30S ribosomal subunit complexed with Era タイプ: RIBOSOME / 詳細: Era was bound to a S1-depleted 30S subunit |
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緩衝液 | 名称: Hepes-KOH / pH: 7.5 / 詳細: Hepes-KOH |
試料 | 濃度: 0.032 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | 詳細: Quantifoil holley-carbon film grids |
急速凍結 | 凍結剤: ETHANE / 詳細: Rapid-freezing in liquid ethane |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Tecnai F20 / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TECNAI F20 / 日付: 2003年3月25日 |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 50000 X / 倍率(補正後): 49696 X / 最大 デフォーカス(公称値): 3940 nm / 最小 デフォーカス(公称値): 1180 nm / Cs: 2 mm |
試料ホルダ | 温度: 93 K / 傾斜角・最大: 0 ° / 傾斜角・最小: 0 ° |
撮影 | 電子線照射量: 20 e/Å2 / フィルム・検出器のモデル: KODAK SO-163 FILM |
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解析
EMソフトウェア |
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CTF補正 | 詳細: CTF correction of 3D-MAPS by wiener filtration | |||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | |||||||||||||||||||||
3次元再構成 | 手法: reference based alignment / 解像度: 13.5 Å / ピクセルサイズ(実測値): 2.82 Å / 倍率補正: TMV 詳細: projection matching using spider package. The coordinates for only the alpha carbons in protein and phosphoruses in nucleic acid are present in the structure. The number of missing atoms was ...詳細: projection matching using spider package. The coordinates for only the alpha carbons in protein and phosphoruses in nucleic acid are present in the structure. The number of missing atoms was so much that remark 470 for the missing atoms list were removed. 対称性のタイプ: POINT | |||||||||||||||||||||
原子モデル構築 | プロトコル: RIGID BODY FIT / 空間: REAL Target criteria: X-ray coordinates of the 30S ribosomal subunit and era were fitted into the 13.5 angstroms resolution CRYO-EM map of the T. Thermophilus 30S subunit-era complex. The atomic structure ...Target criteria: X-ray coordinates of the 30S ribosomal subunit and era were fitted into the 13.5 angstroms resolution CRYO-EM map of the T. Thermophilus 30S subunit-era complex. The atomic structure of era was fitted as 3 rigid bodies, N-terminal domain, C-terminal domain and C-terminal helix within the C-terminal domain. the resultant era structure was then energy minimized. The X-ray coordinates of T. Thermophilus 30S subunit was fitted as 4 rigid bodies, head, body, platform and 16S rRNA 3' minor domains. Only the proteins and segments of RNA helices of the 30S subunit that contact era in the era-30S complex are included here. 詳細: METHOD--Cross-correlation coefficient based manual fitting in O REFINEMENT PROTOCOL--MULTIPLE RIGID BODY | |||||||||||||||||||||
原子モデル構築 |
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精密化ステップ | サイクル: LAST
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