ジャーナル: J Mol Biol / 年: 2006 タイトル: Structural basis for detoxification and oxidative stress protection in membranes. 著者: Peter J Holm / Priyaranjan Bhakat / Caroline Jegerschöld / Nobuhiko Gyobu / Kaoru Mitsuoka / Yoshinori Fujiyoshi / Ralf Morgenstern / Hans Hebert / 要旨: Synthesis of mediators of fever, pain and inflammation as well as protection against reactive molecules and oxidative stress is a hallmark of the MAPEG superfamily (membrane associated proteins in ...Synthesis of mediators of fever, pain and inflammation as well as protection against reactive molecules and oxidative stress is a hallmark of the MAPEG superfamily (membrane associated proteins in eicosanoid and glutathione metabolism). The structure of a MAPEG member, rat microsomal glutathione transferase 1, at 3.2 A resolution, solved here in complex with glutathione by electron crystallography, defines the active site location and a cytosolic domain involved in enzyme activation. The glutathione binding site is found to be different from that of the canonical soluble glutathione transferases. The architecture of the homotrimer supports a catalytic mechanism involving subunit interactions and reveals both cytosolic and membraneous substrate entry sites, providing a rationale for the membrane location of the enzyme.
履歴
登録
2006年6月7日
登録サイト: RCSB / 処理サイト: RCSB
改定 1.0
2007年5月22日
Provider: repository / タイプ: Initial release
改定 1.1
2008年5月1日
Group: Version format compliance
改定 1.2
2011年7月13日
Group: Derived calculations / Version format compliance
モード: BRIGHT FIELD / 倍率(公称値): 60000 X / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 300 nm / Cs: 1.6 mm
試料ホルダ
温度: 4 K / 傾斜角・最大: 62.6 ° / 傾斜角・最小: 0 °
撮影
電子線照射量: 10 e/Å2 詳細: Kodak SO163 film for images, CCD for electron diffraction patterns
放射
プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: electron
放射波長
相対比: 1
-
解析
ソフトウェア
名称: REFMAC / バージョン: 5.2.0005 / 分類: 精密化
CTF補正
詳細: Crystallographic
3次元再構成
手法: Crystallographic / 解像度: 3.2 Å / ピクセルサイズ(公称値): 1.17 Å 倍率補正: Gold electron diffraction to establish exact unit cell parameters 対称性のタイプ: 2D CRYSTAL
精密化
解像度: 3.2→10 Å / Cor.coef. Fo:Fc: 0.619 / Cor.coef. Fo:Fc free: 0.356 / SU B: 29.134 / SU ML: 0.54 / 交差検証法: THROUGHOUT / ESU R: 1.747 / ESU R Free: 0.635 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD / 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
Rfactor
反射数
%反射
Selection details
Rfree
0.37628
457
9.4 %
RANDOM
Rwork
0.33894
-
-
-
obs
0.34237
4409
79.25 %
-
溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK