15K12739 研究成果報告書

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2 様 式 C 19 F 19 1 Z 19 CK 19 共通 1 研究開始当初の背景 近年の化学合成法や試験管内翻訳合成系の 発達により 簡便に望みの配列のペプチドを 合成することが可能になってきている しか しながら 強い生物活性を誇る天然物には 主鎖がアミド結合だけではなく アゾリン骨 格などのヘテロ環を始めとした主鎖骨格修飾 を含むペプチドが多く存在しており 図 1 これら及びその誘導体の合成には技術的な困 難を伴うことが依然として多い もしこうい った生物活性分子として高いポテンシャルを 有する化合物群を自在にかつ簡便に合成でき れば 天然物を模した人工生物活性分子の創 製の道が拓ける 非タンパク質性アミノ酸を含むペプチド鎖の 形成 ②ペプチド中のアミド結合を脱水ヘテ ロ環化する汎用修飾酵素 酵素 による 骨格変換 ③水中で進行する有機化学反応に よる非酵素的な骨格変換 を経て 目的の天 然物様主鎖修飾ペプチドが DNA を鋳型とし て生産される 図 2 この生合成系と有機合 成の長所を融合する戦略により 多彩な主鎖 修飾ペプチドの合成を行った 4 研究成果 本課題の研究成果の一つとして 主鎖ヘテ ロ環骨格の一つであるチアゾール環を有する ペプチドの試験管内人工生合成系を確立した 図 3 ペプチド主鎖骨格中のチアゾール構 3.1 Examples peptidic natural products with backbone azolide moi 造は生物活性を示す天然物に広く見られる構 造であり チアゾール含有ペプチドを簡便に 合成する技術の開発は 優れた新規生物活性 ペプチド創出への応用が期待される モデル 実験において 脱水複素環化酵素 によ Although peptides would be good cidate り連続するチアゾリン構造がペプチドに導入 される際 副産物としてチアゾール-チアゾリ novel bioactive peptides, to best my knowledge, no ン構造が形成することを見出し この副反応 を積極的に利用することでチアゾール含有ペ RiPPs mediated biosyntic pathways was reported, makg it hard to approac プチドの合成を行うことを着想した 実際に 図 1 天然物に見られる 主鎖骨格修飾を含 azolide-contag peptides justによる酵素修飾の後 by reconstitution biosyntic enzymes. B 脱水複素環化酵素 むペプチドの例 に 化学的に酸化反応を行うことで チアゾ amples peptidic natural products with backbone azolide moieties. 3.1 Examples peptidic naturaltegration products with backbone azolide moi study described chapter 2, which enzymatic ール-チアゾリン構造が得られることが分か 2 研究の目的 った 加えて 遺伝暗号リプログラミング法 本研究課題では 人工天然物の創製に資す enabled thiazole-contag peptides, it was envisioned that th を用いて位置特異的な重水素ラベル化を行う る試験管内人工生合成系を開発することを目 ことで 酸化反応によるチアゾール構造の形 指した 具体的には 強い生物活性の発揮に enzymatic modification reactions would also be applied for 成が位置特異的に進行することが明らかとな hough peptides would be good cidates for development Although 重要と期待される複数の主鎖修飾型ペプチド peptides ( 3.2).peptides would be good cidate った 本研究により確立された酸化反応は を簡便に生産できる試験管内人工生合成系を ctive peptides, to best my knowledge, no reductase 種々のペプチド配列に適用可能であることも volved novel bioactive peptides, to best knowledge, nodiversity, それぞれ確立することが目標である In present study, order tomy exp structural which is 示され 汎用的なチアゾール含有ペプチドの ed biosyntic pathways was reported, makg it hard to approach vitroripps mediated biosyntic pathways was reported, makgreactions, it hard toaapproac 試験管内人工合成法が確立された また 人 subsequent modification cell-fr 工アミノ酸であるβ-ハロトレオニンを遺伝 ag peptides just by reconstitution biosyntic enzymes. Based onazolide-contag previous peptides just by reconstitution biosyntic enzymes.cyb 暗号のリプログラミング法にてペプチド鎖に cyclodehydratase, by sodium 導入後 によるオキサゾリン化 化学的 ed chapter 2, which tegration enzymatic modification reactions study described chapter 2, which tegration enzymatic combed to achieve vitro な脱ハロゲン化水素と異性化反応を経ること で オキサゾール含有ペプチドを合成できる enabled thiazole-contag peptides, it was envisioned that th nsis thiazole-contag peptides, it was envisioned that approach tegratg 試験管内人工合成法も報告している enzymatic modification reactions would also be applied for vitro enzymatic modification reactions would also be applied for Based on se results, proposed for fo peptides ( 3.2) The cyclodehydration by coupled with transla In he present study, order to exp structural diversity, which is accessible by vitro present study, order to exp structural diversity, which is derived from cystee residue (1) to peptide. The resu 図 2 による翻訳後修飾と化学的酸化反 subsequent modification reactions, a cell-fr d subsequent modification reactions, a cell-free system,proposed Based on se results, Based proposed on se results, for formation for Ψ[CH yieldg formation shown Ψ[CH 2NH] is shown 応を組み合わせたチアゾール環含有ペプチド 2NH] isthiazolide sodium (3), wh の試験管内人工生合成 cyclodehydratase, sodiumcy 3.2 Schematic illustration concept (2) vitroby 3.6. The The cyclodehydration by coupled by with coupled stalled with thiazole stalled (2) nal cyclodehydratase, by cyclodehydration sodium3.6. were after tautomerization tothiazole ime termediate (4 peptides by tegration enzymatic modifi combed to achieve vitro derived from cystee derived residue from(1) cystee to residue peptide. to The resultg peptide. thiazole The resultg (2) wasthiazole reduced by (2) was reduced by chieve vitro 図 3 (1) による翻訳後修飾と化学的酸化反 (5). 3 研究の方法 応を組み合わせたチアゾール環含有ペプチド sodium sodium yieldg thiazolide yieldg thiazolide (3), which is furr (3), which reducedis by furr sodium reduced by sodium 本研究では 後藤らがこれまでに開発して の試験管内人工生合成 きた改変翻訳系 高い基質許容性を持つペプ after tautomerization afterto tautomerization ime termediate to ime (4) yieldg termediate Ψ[CH (4) yieldg Ψ[CH2NH] structure 2NH] structure チド修飾酵素 水中で進行する有機化 さらに 主鎖骨格にチアゾリジン構造及び (5). (5). 学的骨格変換反応 の三者を組み合わせるこ 68 還元型アミド結合 Ψ[CH2NH]結合 をもつ とで 試験管内人工生合成系を構築した こ ペプチドの試験管内人工生合成系も開発した 1.3 Examples ribosomally synsized ly modified peptides (RiPPs). れにより 三段階の骨格形成/骨格変換ステッ 図 4 チアゾリジン構造は生物活性を示す プ ①遺伝暗号リプログラミング法を用いた Azoles, azoles or non-stard structures are shown blue, red orange, respectively. In ペプチド性天然物に見られる構造であるが 2.5 Chemical concept oneasterisk two consecutive thiazoles structure polyonamide, amo acid residues are oxidation labeled with 3.2D-configuration Schematic with vitro 3.6illustration Proposed for formation Ψ[CH2 sequence correspondg peptide used this experimen chematic illustration (*). concept vitro thiazolde-contag peptides by expressed tegration enzymatic thiazole-contag modifi residues to be modified by cyclodehydratase are underled e tegration enzymatic modification reactions ontag peptides ( 3.2). N-acetyl phenylalane, which is corporated to peptide 2.5 Chemical oxidation one two consecutive thiazoles peptidic DN to prevent sideoxidation at thioer methione. (B)backbone Reaction (A) schem

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