結晶構造を基にした酵素反応機構の解析

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タイトル別名
  • Investigation of the Reaction Mechanism of Enzymes Based on their Crystal Structures
  • 結晶構造を基にした酵素反応機構の解析 : オロチジン-リン酸脱炭酸酵素を題材に
  • ケッショウ コウゾウ オ モト ニ シタ コウソ ハンノウ キコウ ノ カイセキ : オロチジン-リンサン ダツタンサン コウソ オ ダイザイ ニ
  • ~オロチジン一リン酸脱炭酸酵素を題材に~

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Crystallographic investigation combined with QM/MM simulation and biochemical analysis is the powerful tool to elucidate the enzyme mechanisms. Here, orotidine 5'-monophosphate decarboxylase (ODCase) is selected as a representative example of intensively investigated enzymes. This enzyme accelerates the conversion of orotidine 5'-monophosphate into uridine 5'-monophosphate by 17 orders of magnitude, and is known as one of the most proficient enzymes. Although the decarboxylation reaction is an electrophilic-like reaction, ODCase also catalyzes nucleophilic-like reactions at the same catalytic site with the decarboxylation. Our crystallographic analysis at 1.0−1.8 Å resolution combined with ab initio calculation and biochemical assays elucidated the catalysis of ODCase utilizes the substrate distortion in addition to the transition state stabilization.

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