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基本情報
登録情報 | データベース: PDB / ID: 9be7 | |||||||||||||||
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タイトル | Alkalihalobacillus halodurans (Aha) trp RNA binding attenuation protein (TRAP) mutant dTRAP without Trp | |||||||||||||||
![]() | Transcription attenuation protein MtrB | |||||||||||||||
![]() | RNA BINDING PROTEIN / Hexamer of dTRAP apo | |||||||||||||||
機能・相同性 | Transcription attenuation protein MtrB / Tryptophan RNA-binding attenuator protein domain / Tryptophan RNA-binding attenuator protein / Tryptophan RNA-binding attenuator protein-like domain superfamily / DNA-templated transcription termination / regulation of DNA-templated transcription / RNA binding / Transcription attenuation protein MtrB![]() | |||||||||||||||
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: 4.24 Å | |||||||||||||||
![]() | Yang, H. / Stachowski, K. / Foster, M. | |||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural basis of nearest-neighbor cooperativity in the ring-shaped gene regulatory protein TRAP from protein engineering and cryo-EM. 著者: Weicheng Li / Haoyun Yang / Kye Stachowski / Andrew S Norris / Katie Lichtenthal / Skyler Kelly / Paul Gollnick / Vicki H Wysocki / Mark P Foster / ![]() 要旨: The homo-dodecameric ring-shaped RNA binding attenuation protein (TRAP) from binds up to twelve tryptophan ligands (Trp) and becomes activated to bind a specific sequence in the 5' leader region of ...The homo-dodecameric ring-shaped RNA binding attenuation protein (TRAP) from binds up to twelve tryptophan ligands (Trp) and becomes activated to bind a specific sequence in the 5' leader region of the operon mRNA, thereby downregulating biosynthesis of Trp. Thermodynamic measurements of Trp binding have revealed a range of cooperative behavior for different TRAP variants, even if the averaged apparent affinities for Trp have been found to be similar. Proximity between the ligand binding sites, and the ligand-coupled disorder-to-order transition has implicated nearest-neighbor interactions in cooperativity. To establish a solid basis for describing nearest-neighbor cooperativity in TRAP, we engineered variants constructed with two subunits connected by a flexible linker (dTRAP). We mutated the binding sites of alternating protomers such that only every other site was competent for Trp binding (WT-Mut dTRAP). Ligand binding monitored by NMR, calorimetry, and native mass spectrometry revealed strong cooperativity in dTRAP containing adjacent binding-competent sites, but a severe binding defect when the wild-type sites were separated by mutated sites. Cryo-EM experiments of dTRAP in its ligand-free apo state, and both dTRAP and WT-Mut dTRAP in the presence of Trp, revealed progressive stabilization of loops that gate the Trp binding site and participate in RNA binding. These studies provide important insights into the thermodynamic and structural basis for the observed ligand binding cooperativity in TRAP. Such insights can be useful for understanding allosteric control networks and for the development of those with defined ligand sensitivity and regulatory control. | |||||||||||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 322.8 KB | 表示 | ![]() |
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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
関連構造データ | ![]() 44472MC ![]() 9bdsC ![]() 9be8C M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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リンク
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集合体
登録構造単位 | ![]()
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非結晶学的対称性 (NCS) | NCSドメイン:
NCSドメイン領域: Component-ID: 1 / Ens-ID: ens_1 / Beg auth comp-ID: ASN / Beg label comp-ID: ASN / End auth comp-ID: GLU / End label comp-ID: GLU / Auth seq-ID: 8 - 159 / Label seq-ID: 8 - 159
NCS oper:
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要素
#1: タンパク質 | 分子量: 18418.471 Da / 分子数: 6 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 遺伝子: mtrB, BH1647 / 発現宿主: ![]() ![]() Has protein modification | N | |
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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: Hexamer dTRAP protein complex without Trp / タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT | |||||||||||||||
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分子量 | 実験値: NO | |||||||||||||||
由来(天然) | 生物種: ![]() | |||||||||||||||
由来(組換発現) | 生物種: ![]() ![]() | |||||||||||||||
緩衝液 | pH: 8 / 詳細: 20 mM HEPES, 200 mM NaCl, pH 8 | |||||||||||||||
緩衝液成分 |
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試料 | 濃度: 6 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: An aliquot of 10 mg/mL of apo dTRAP was diluted with cryo-EM buffer (20 mM HEPES, 200 mM NaCl, pH 8) supplemented with a 0.6% stock of Triton X-100 to obtain a final sample of 6 mg/mL protein ...詳細: An aliquot of 10 mg/mL of apo dTRAP was diluted with cryo-EM buffer (20 mM HEPES, 200 mM NaCl, pH 8) supplemented with a 0.6% stock of Triton X-100 to obtain a final sample of 6 mg/mL protein and 0.05% Triton X-100. | |||||||||||||||
試料支持 | 詳細: 20 mA, 30 sec hold, 1 min glow discharge using a PELCO easiGlow Discharge System グリッドの材料: GOLD / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 | |||||||||||||||
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277.15 K 詳細: lotted with a blot force of 1 for 4 seconds at 277.15K and 100% relative humidity before being plunged frozen into liquid ethane |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: TFS KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 500 nm |
撮影 | 電子線照射量: 60 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOCONTINUUM (6k x 4k) |
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解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||
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3次元再構成 | 解像度: 4.24 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 91038 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||
精密化 | 交差検証法: NONE 立体化学のターゲット値: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||||||||||||||||||||
原子変位パラメータ | Biso mean: 130.74 Å2 | ||||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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Refine LS restraints NCS |
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