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基本情報
登録情報 | データベース: PDB / ID: 1ega | ||||||
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タイトル | CRYSTAL STRUCTURE OF A WIDELY CONSERVED GTPASE ERA | ||||||
![]() | PROTEIN (GTP-BINDING PROTEIN ERA) | ||||||
![]() | HYDROLASE / ERA / GTPASE / RNA-BINDING / RAS-LIKE | ||||||
機能・相同性 | ![]() guanosine tetraphosphate binding / ribosomal small subunit binding / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit rRNA binding / rRNA binding / protein phosphorylation / GTPase activity / GTP binding / RNA binding ...guanosine tetraphosphate binding / ribosomal small subunit binding / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit rRNA binding / rRNA binding / protein phosphorylation / GTPase activity / GTP binding / RNA binding / plasma membrane / cytoplasm / cytosol 類似検索 - 分子機能 | ||||||
生物種 | ![]() ![]() | ||||||
手法 | ![]() ![]() | ||||||
![]() | Chen, X. / Ji, X. | ||||||
![]() | ![]() 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. #1: ![]() タイトル: Cell Cycle Arrest in Era GTPase Mutants: A Potential Growth Rate-Regulated Checkpoint in E. Coli 著者: Britton, R.A. / Powell, B.S. / Dasgupta, S. / Sun, Q. / Margolin, W. / Lupski, J.R. / Court, D.L. | ||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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ダウンロード
PDBx/mmCIF形式 | ![]() | 128.1 KB | 表示 | ![]() |
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PDB形式 | ![]() | 101 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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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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単位格子 |
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非結晶学的対称性 (NCS) | NCS oper: (Code: given Matrix: (-0.436003, 0.021836, 0.89968), ベクター: |
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要素
#1: タンパク質 | 分子量: 33858.078 Da / 分子数: 2 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() #2: 化合物 | ChemComp-SO4 / #3: 水 | ChemComp-HOH / | |
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-実験情報
-実験
実験 | 手法: ![]() |
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試料調製
結晶 | マシュー密度: 3.5 Å3/Da / 溶媒含有率: 65 % 解説: THE STRUCTURE WAS SOLVED BY A COMBINATION OF MIR AND MAD METHODS. MAD DATA SETS, USING HG ANOMALOUS SCATTERING AT WAVELENGTH 1.00870A, 1.00764A, 0.99184A AND 1.00903A, WERE COLLECTED AT NSLS ...解説: THE STRUCTURE WAS SOLVED BY A COMBINATION OF MIR AND MAD METHODS. MAD DATA SETS, USING HG ANOMALOUS SCATTERING AT WAVELENGTH 1.00870A, 1.00764A, 0.99184A AND 1.00903A, WERE COLLECTED AT NSLS BEAMLINE X9B WITH MAR345 DETECTOR. | ||||||||||||||||||||||||||||||
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結晶化 | pH: 8 詳細: PROTEIN 8MG/ML TRIS BUFFER 0.1M, PH 8.0 LITHIUM SULFATE 0.8M SODIUM CHLORIDE 0.8M | ||||||||||||||||||||||||||||||
溶液の組成 |
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結晶化 | *PLUS 手法: 蒸気拡散法, ハンギングドロップ法 | ||||||||||||||||||||||||||||||
溶液の組成 | *PLUS
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-データ収集
回折 | 平均測定温度: 100 K |
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放射光源 | 由来: ![]() |
検出器 | タイプ: MARRESEARCH / 検出器: IMAGE PLATE / 日付: 1998年6月18日 / 詳細: BENT MIRRORS |
放射 | モノクロメーター: GRAPHITE / プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray |
放射波長 | 波長: 1.5418 Å / 相対比: 1 |
反射 | 解像度: 2.4→20 Å / Num. obs: 35696 / % possible obs: 99.7 % / Observed criterion σ(I): 0 / 冗長度: 6.4 % / Biso Wilson estimate: 53.4 Å2 / Rsym value: 0.056 / Net I/σ(I): 31.8 |
反射 シェル | 解像度: 2.4→2.5 Å / 冗長度: 6.1 % / Mean I/σ(I) obs: 3.9 / Rsym value: 0.49 / % possible all: 99.1 |
反射 | *PLUS Rmerge(I) obs: 0.056 |
反射 シェル | *PLUS % possible obs: 99.1 % / Rmerge(I) obs: 0.49 |
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解析
ソフトウェア |
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精密化 | 構造決定の手法: ![]() 詳細: N-TERMINAL RESIDUES 1-3 FOR BOTH CHAINS, AND C-TERMINAL RESIDUES 296-301 FOR CHAIN A AND RESIDUES 297-301 FOR CHAIN B WERE NOT OBSERVED IN THE ELECTRON DNESITY AND NOT INCLUDED IN THE MODEL; ...詳細: N-TERMINAL RESIDUES 1-3 FOR BOTH CHAINS, AND C-TERMINAL RESIDUES 296-301 FOR CHAIN A AND RESIDUES 297-301 FOR CHAIN B WERE NOT OBSERVED IN THE ELECTRON DNESITY AND NOT INCLUDED IN THE MODEL; RESIDUES 224 - 228 IN BOTH CHAINS WERE NOT OBSERVED IN THE ELECTRON DENSITY AND NOT INCLUDED IN THE REFINEMENT, BUT BUILT STEREOCHEMICALLY AND INCLUDED IN THE MODEL; RESTRAINTS BETWEEN THE TWO COPIES OF MOLECULES WERE APPLIED DURING THE INITIAL STAGE OF THE REFINEMENT ONLY
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原子変位パラメータ | Biso mean: 49.5 Å2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
精密化ステップ | サイクル: LAST / 解像度: 2.4→8 Å
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拘束条件 |
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LS精密化 シェル | 解像度: 2.4→2.5 Å / Rfactor Rfree error: 0.035 / Total num. of bins used: 8
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ソフトウェア | *PLUS 名称: ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
拘束条件 | *PLUS
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