- PDB-7ux8: Crystal structure of MfnG, an L- and D-tyrosine O-methyltransfera... -
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基本情報
登録情報
データベース: PDB / ID: 7ux8
タイトル
Crystal structure of MfnG, an L- and D-tyrosine O-methyltransferase from the marformycin biosynthesis pathway of Streptomyces drozdowiczii, with SAH and L-Tyrosine bound at 1.4 A resolution (P212121 - form II)
The construct was cloned into the EcoRI and HindIII sites of pET22b with an N-terminal Met (0) ...The construct was cloned into the EcoRI and HindIII sites of pET22b with an N-terminal Met (0) added and the native GUG-start codon being expressed as V. A C-terminal expression and 6-His tag ASENLYFQ/GGGHHHHHHG leaving a C-terminal ASENLYFQ after removal of the 6-His tag with TEV protease
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実験情報
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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: 2.13 Å3/Da / 溶媒含有率: 42.17 %
結晶化
温度: 298 K / 手法: 蒸気拡散法, シッティングドロップ法 / pH: 8 詳細: 0.1 M Tris pH 8, 30% Polyethylene glycol monomethyl ether (PEG MME) 2000, Additive: 0.002 M S-Adenosyl methionine (SAM/AdoMet), Soaking: added crystaline L-Tyrosine to the drop after MfnG crystals were formed
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データ収集
回折
平均測定温度: 100 K Crystal treatment: crystaline L-Tyrosine was added to the drop after the MfnG crystals were formed. After 46 hours, the MfnG crystals were harvested and flash cooled by immersion in liquid nitrogen Serial crystal experiment: N
解像度: 1.4→31.3 Å / SU ML: 0.19 / 交差検証法: THROUGHOUT / σ(F): 1.35 / 位相誤差: 17.1 / 立体化学のターゲット値: ML 詳細: 1. HYDROGENS HAVE BEEN INCLUDED AT THEIR RIDING POSITIONS USING THE ELECTRON CLOUD DISTANCES. 2. THE STRUCTURE WAS REFINED USING REFERENCE MODEL RESTRAINTS FROM THE HIGH RESOLUTION STRUCTURE ...詳細: 1. HYDROGENS HAVE BEEN INCLUDED AT THEIR RIDING POSITIONS USING THE ELECTRON CLOUD DISTANCES. 2. THE STRUCTURE WAS REFINED USING REFERENCE MODEL RESTRAINTS FROM THE HIGH RESOLUTION STRUCTURE FROM THE SAME CRYSTAL FORM CONTAINING THE COPURIFIED METABOLITE (7UX7). 3. THERE WAS CLEAR DIFFERENCE DENSITY FOR L-TYROSINE IN THE ACTIVE SITE IN THE OMIT MAP. HOWEVER, AFTER REFINEMENT, THERE WAS RESIDUAL DIFFERENCE DENSITY SUGGESTING THAT THE SOAKED L-TYROSINE HAD NOT COMPLETELY DISPLACED THE UNKNOWN LIGAND (UNL) THAT HAD CO-PURIFIED WITH THE PROTEIN. TRYING DIFFERENT OCCUPANCY RATIOS, 70:30 WAS THE BEST FIT. 4. THE STRUCTURE CONTAINS AND UNKNOWN LIGAND UNL BOUND IN THE ACTIVE SITE. THE COMPOUND IS A METABOLITE THAT CO-PURIFIED WITH THE PROTEIN. THE STRUCTURE LOOKS SIMILAR TO NIACIN, NICOTINAMIDE, BENZOATE, NITORBENZENE ETC. SINCE THE PRECISE SPECIES IS NOT KNOWN, IT WAS MODELED AS AN UNL. 5. EVEN THOUGH THE CRYSTALLIZATION DROPS WERE SETUP WITH S-ADENOSYLMETHIONINE (SAM/ADOMET), ELECTRON DENSITY CLEARLY SHOWS THAT THE COFACTOR HAS BROKEN DOWN TO S-ADENOSYL-L-HOMOCYSTEINE (SAH/ADOHCY). 6. THE C-TERMINUS OF CHAIN A PACKS AGAINST CHAIN B FROM A SYMMETRY MATE IN THE UNIT CELL. THIS SHIFTS THE POSITION OF SEVERAL RESIDUES IN CHAIN B TO ACCOMMODATE THE C-TERMINAL TAG REGION. HOWEVER, THE INTERACTION IS NOT COMPLETE. AFTER MODELING THIS MAJOR SHIFTED PORTION, THERE IS RESIDUAL DIFFERENCE DENSITY FOR A CONFORMATION THAT IS SIMILAR TO THE WHAT IS SEEN IN CHAIN A AND OTHER CRYSTAL FORMS. OCCUPANCY REFINEMENT SUGGESTED ABOUT 60: 40 SPLIT. SINCE ONLY THE MAJOR PORTION OF THE CHAIN A C-TERMINUS (367-383)COULD BE MODELED, THIS WAS FIXED AT 0.6 OCCUPANCY TO MATCH THE CHAIN B PORTION THAT IT INTERACTS WITH, WHILE THE OTHER 0.4 OCCUPANCY PORTION COULD NOT BE MODELED DUE TO DISORDER.
Rfactor
反射数
%反射
Rfree
0.172
7030
4.98 %
Rwork
0.153
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obs
0.154
141291
99.9 %
溶媒の処理
減衰半径: 0.9 Å / VDWプローブ半径: 1.11 Å / 溶媒モデル: FLAT BULK SOLVENT MODEL