+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 1fqa | |||||||||
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タイトル | STRUCTURE OF MALTOTETRAITOL BOUND TO OPEN-FORM MALTODEXTRIN BINDING PROTEIN IN P2(1)CRYSTAL FORM | |||||||||
要素 | MALTODEXTRIN-BINDING PROTEIN | |||||||||
キーワード | SUGAR BINDING PROTEIN / sugar-binding protein / maltotetraitol | |||||||||
機能・相同性 | 機能・相同性情報 detection of maltose stimulus / maltose transport complex / maltose binding / carbohydrate transport / maltose transport / maltodextrin transmembrane transport / carbohydrate transmembrane transporter activity / ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing / ATP-binding cassette (ABC) transporter complex / cell chemotaxis ...detection of maltose stimulus / maltose transport complex / maltose binding / carbohydrate transport / maltose transport / maltodextrin transmembrane transport / carbohydrate transmembrane transporter activity / ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing / ATP-binding cassette (ABC) transporter complex / cell chemotaxis / outer membrane-bounded periplasmic space / periplasmic space / DNA damage response / membrane 類似検索 - 分子機能 | |||||||||
生物種 | Escherichia coli (大腸菌) | |||||||||
手法 | X線回折 / 解像度: 1.9 Å | |||||||||
データ登録者 | Duan, X. / Hall, J.A. / Nikaido, H. / Quiocho, F.A. | |||||||||
引用 | ジャーナル: J Mol Biol / 年: 2001 タイトル: Crystal structures of the maltodextrin/maltose-binding protein complexed with reduced oligosaccharides: flexibility of tertiary structure and ligand binding. 著者: X Duan / J A Hall / H Nikaido / F A Quiocho / 要旨: The structure of the maltodextrin or maltose-binding protein, an initial receptor for bacterial ABC-type active transport and chemotaxis, consists of two globular domains that are separated by a ...The structure of the maltodextrin or maltose-binding protein, an initial receptor for bacterial ABC-type active transport and chemotaxis, consists of two globular domains that are separated by a groove wherein the ligand is bound and enclosed by an inter-domain rotation. Here, we report the determination of the crystal structures of the protein complexed with reduced maltooligosaccharides (maltotriitol and maltotetraitol) in both the "closed" and "open" forms. Although these modified sugars bind to the receptor, they are not transported by the wild-type transporter. In the closed structures, the reduced sugars are buried in the groove and bound by both domains, one domain mainly by hydrogen-bonding interactions and the other domain primarily by non-polar interactions with aromatic side-chains. In the open structures, which abrogate both cellular activities of active transport and chemotaxis because of the large separation between the two domains, the sugars are bound almost exclusively to the domain rich in aromatic residues. The binding site for the open chain glucitol residue extends to a subsite that is distinct from those for the glucose residues that were uncovered in prior structural studies of the binding of active linear maltooligosaccharides. Occupation of this subsite may also account for the inability of the reduced oligosaccharides to be transported. The structures reported here, combined with those previously determined for several other complexes with active oligosaccharides in the closed form and with cyclodextrin in the open form, revealed at least four distinct modes of ligand binding but with only one being functionally active. This versatility reflects the flexibility of the protein, from very large motions of interdomain rotation to more localized side-chain conformational changes, and adaptation by the oligosaccharides as well. | |||||||||
履歴 |
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-構造の表示
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 1fqa.cif.gz | 97.2 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb1fqa.ent.gz | 71.8 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 1fqa.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 1fqa_validation.pdf.gz | 444.2 KB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 1fqa_full_validation.pdf.gz | 450.8 KB | 表示 | |
XML形式データ | 1fqa_validation.xml.gz | 9.5 KB | 表示 | |
CIF形式データ | 1fqa_validation.cif.gz | 16.6 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/fq/1fqa ftp://data.pdbj.org/pub/pdb/validation_reports/fq/1fqa | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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1 |
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単位格子 |
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-要素
#1: タンパク質 | 分子量: 40695.051 Da / 分子数: 1 / 由来タイプ: 組換発現 / 詳細: COMPLEXED WITH MALTOTETRAITOL / 由来: (組換発現) Escherichia coli (大腸菌) / 発現宿主: Escherichia coli (大腸菌) / 参照: UniProt: P02928, UniProt: P0AEX9*PLUS |
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#2: 多糖 | alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-sorbitol |
#3: 水 | ChemComp-HOH / |
-実験情報
-実験
実験 | 手法: X線回折 / 使用した結晶の数: 1 |
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-試料調製
結晶 | マシュー密度: 2.01 Å3/Da / 溶媒含有率: 38.84 % | ||||||||||||||||||||||||||||||||||||||||||||||||||
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結晶化 | 温度: 273 K / 手法: 蒸気拡散法, ハンギングドロップ法 / pH: 6.6 詳細: PEG 3350, NaN3, MES, pH 6.6, VAPOR DIFFUSION, HANGING DROP, temperature 273.0K | ||||||||||||||||||||||||||||||||||||||||||||||||||
結晶化 | *PLUS pH: 6.2 | ||||||||||||||||||||||||||||||||||||||||||||||||||
溶液の組成 | *PLUS
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-データ収集
回折 | 平均測定温度: 200 K |
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放射光源 | 由来: 回転陽極 / タイプ: RIGAKU RU200 / 波長: 1.5418 |
検出器 | タイプ: MACSCIENCE / 検出器: IMAGE PLATE |
放射 | 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: 1.8→30 Å / Num. obs: 21890 / % possible obs: 84 % / Observed criterion σ(F): 2 / Observed criterion σ(I): 1 / Rmerge(I) obs: 0.045 |
反射 シェル | 解像度: 1.8→1.9 Å / Rmerge(I) obs: 0.126 / % possible all: 69 |
反射 | *PLUS 最低解像度: 30 Å / % possible obs: 84 % / Num. measured all: 170555 |
反射 シェル | *PLUS % possible obs: 69.6 % |
-解析
ソフトウェア |
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精密化 | 解像度: 1.9→30 Å / 交差検証法: THROUGHOUT / σ(F): 2
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精密化ステップ | サイクル: LAST / 解像度: 1.9→30 Å
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拘束条件 |
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ソフトウェア | *PLUS 名称: CNS / 分類: refinement | ||||||||||||||||
精密化 | *PLUS 最高解像度: 1.9 Å / 最低解像度: 30 Å / σ(F): 2 / % reflection Rfree: 10 % / Rfactor obs: 0.176 | ||||||||||||||||
溶媒の処理 | *PLUS | ||||||||||||||||
原子変位パラメータ | *PLUS | ||||||||||||||||
拘束条件 | *PLUS
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