1. 8PA IS A COVALENT ADDUCT BETWEEN 3-(PYRIDIN-3-YL) ACRYLALDEHYDE AND THE THDP COFACTOR. 2. ...1. 8PA IS A COVALENT ADDUCT BETWEEN 3-(PYRIDIN-3-YL) ACRYLALDEHYDE AND THE THDP COFACTOR. 2. ACCORDING TO AUTHORS, BOTH RELATED ENTRIES 3F6B AND 3F6E HAVE THE SAME SUBSTRATE-COFACTOR ADDUCT. THESE STRUCTURES WERE SOLVED IN SUPPORT OF ENZYMOLOGICAL EXPERIMENTS WITH BENZOYLFORMATE DECARBOXYLASE. THE ENZYME DECARBOXYLATES THE 3-PKB SUBSTRATE TO GENERATE AN ALDEHYDE. THIS ALDEHYDE IS PAA, THE SUBSTRATE APPLIED IN THE EXPERIMENTS THAT GAVE RISE TO 3F6B STRUCTURE. WHEN AUTHORS CRYSTALLIZE THE ENZYME IN THE PRESENCE OF 3-PKB, THE SPECIES THAT IS GENERATED THAN TRAPPED IS PAA, VIA REACTION WITH THE THIAZOLIUM YLID OF THE THDP COFACTOR TO GENERATE THE ADDUCT SEEN IN BOTH STRUCTURES. THE 3-PKB INHIBITOR WAS DESIGNED FIRST, AND THEN PAA WAS DEVELOPED TO CHECK THE HYPOTHESIS THAT 3-PKB IS CONVERTED TO PAA IN THE ACTIVE SITE. INDEED, THE ADDUCT IS THE SAME IN 3F6B AND 3F6E.
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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: 2.4 Å3/Da / 溶媒含有率: 48.75 %
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: 8.5 詳細: 100 mM Tris-HCl pH 8.5, 150 mM CaCl2, 0.5% v/v MPD (2-methyl-2,4-pentanediol), 22% v/v PEG 400, VAPOR DIFFUSION, HANGING DROP, temperature 298K