METHYL-2(2-CARBOXY-4-AMINO-PHENYL)ACETATE (ISM): LINKS C1 OF ISM AND OG OF S201 AND C8 OF ISM AND ...METHYL-2(2-CARBOXY-4-AMINO-PHENYL)ACETATE (ISM): LINKS C1 OF ISM AND OG OF S201 AND C8 OF ISM AND NE2 OF H254 THE ISOCOUMARIN RING IS OPENED BY THE NUCLEOPHILIC ATTACK OF S201 ON C1-O1 BOND AND SUBSEQUENTLY A REACTION BETWEEN HISTIDINE AT THE ACTIVE SITE CREATES A SECOND COVALENT BOND. ISM IS IDENTICAL TO HETEROGEN ICU IN PDB 1JIM BUT LACKS AN ACETATE MOLECULE AT POSITION C8. DIFFERENCE MAP PEAK INDICATE A POSSIBILITY OF ALTERNATE CONFORMATION AT RESIDUES 250-252 BUT SINCE THE DENSITY IS WEAK ONLY ONE CONFORMATION BASED ON GEOMETRY AND MAP HAS BEEN MODELLED. THE OCCUPANCY OF THE LIGAND ISM IS SET TO 1, WHEN REFINED IT INDICATES AN OCCUPANCY OF 0.92-0.96.
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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: 3.5 Å3/Da / 溶媒含有率: 63.47 % / 解説: NONE
結晶化
温度: 298 K / 手法: 蒸気拡散法, ハンギングドロップ法 / pH: 7 / 詳細: 2 M AMMONIUM CHLORIDE, 0.1 M BIS-TRIS PH 7.0, 298K