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データを開く
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基本情報
登録情報 | データベース: PDB / ID: 8hi6 | ||||||
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タイトル | Crystal structure of the NADP+ and MSA bound N terminal domain of bi-functional malonyl-CoA reductase from Roseiflexus castenholzii | ||||||
![]() | Short-chain dehydrogenase/reductase SDR | ||||||
![]() | OXIDOREDUCTASE / The 3-hydroxypropionate cycle / Short chain dehydrogenase | ||||||
機能・相同性 | ![]() fatty acid elongation / oxidoreductase activity, acting on the CH-OH group of donors, NAD or NADP as acceptor / nucleotide binding 類似検索 - 分子機能 | ||||||
生物種 | ![]() | ||||||
手法 | ![]() ![]() ![]() | ||||||
![]() | Zhang, X. / Wu, W.P. / Xu, X. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural basis of a bi-functional malonyl-CoA reductase (MCR) from the photosynthetic green non-sulfur bacterium . 著者: Xin Zhang / Jiyu Xin / Zhiguo Wang / Wenping Wu / Yutong Liu / Zhenzhen Min / Yueyong Xin / Bing Liu / Jun He / Xingwei Zhang / Xiaoling Xu / ![]() 要旨: Malonyl-CoA reductase (MCR) is a NADPH-dependent bi-functional enzyme that performs alcohol dehydrogenase and aldehyde dehydrogenase (CoA-acylating) activities in the N- and C-terminal fragments, ...Malonyl-CoA reductase (MCR) is a NADPH-dependent bi-functional enzyme that performs alcohol dehydrogenase and aldehyde dehydrogenase (CoA-acylating) activities in the N- and C-terminal fragments, respectively. It catalyzes the two-step reduction of malonyl-CoA to 3-hydroxypropionate (3-HP), a key reaction in the autotrophic CO fixation cycles of green non-sulfur bacteria and the archaea . However, the structural basis underlying substrate selection, coordination, and the subsequent catalytic reactions of full-length MCR is largely unknown. For the first time, we here determined the structure of full-length MCR from the photosynthetic green non-sulfur bacterium (MCR) at 3.35 Å resolution. Furthermore, we determined the crystal structures of the N- and C-terminal fragments bound with reaction intermediates NADP and malonate semialdehyde (MSA) at 2.0 Å and 2.3 Å, respectively, and elucidated the catalytic mechanisms using a combination of molecular dynamics simulations and enzymatic analyses. Full-length MCR was a homodimer of two cross-interlocked subunits, each containing four tandemly arranged short-chain dehydrogenase/reductase (SDR) domains. Only the catalytic domains SDR1 and SDR3 incorporated additional secondary structures that changed with NADP-MSA binding. The substrate, malonyl-CoA, was immobilized in the substrate-binding pocket of SDR3 through coordination with Arg1164 and Arg799 of SDR4 and the extra domain, respectively. Malonyl-CoA was successively reduced through protonation by the Tyr743-Arg746 pair in SDR3 and the catalytic triad (Thr165-Tyr178-Lys182) in SDR1 after nucleophilic attack from NADPH hydrides. IMPORTANCE The bi-functional MCR catalyzes NADPH-dependent reduction of malonyl-CoA to 3-HP, an important metabolic intermediate and platform chemical, from biomass. The individual MCR-N and MCR-C fragments, which contain the alcohol dehydrogenase and aldehyde dehydrogenase (CoA-acylating) activities, respectively, have previously been structurally investigated and reconstructed into a malonyl-CoA pathway for the biosynthetic production of 3-HP. However, no structural information for full-length MCR has been available to illustrate the catalytic mechanism of this enzyme, which greatly limits our capacity to increase the 3-HP yield of recombinant strains. Here, we report the cryo-electron microscopy structure of full-length MCR for the first time and elucidate the mechanisms underlying substrate selection, coordination, and catalysis in the bi-functional MCR. These findings provide a structural and mechanistic basis for enzyme engineering and biosynthetic applications of the 3-HP carbon fixation pathways. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 124.8 KB | 表示 | ![]() |
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PDB形式 | ![]() | 92.1 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 8hi4SC ![]() 8hi5C C: 同じ文献を引用 ( S: 精密化の開始モデル |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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リンク
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集合体
登録構造単位 | ![]()
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1 | ![]()
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単位格子 |
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要素
#1: タンパク質 | 分子量: 63446.832 Da / 分子数: 1 / 断片: N terminal domain / 由来タイプ: 組換発現 詳細: His573-His578 are expression tag used for purification of the target protein 由来: (組換発現) ![]() 株: DSM 13941 / HLO8 / 遺伝子: Rcas_2929 / 発現宿主: ![]() ![]() |
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#2: 化合物 | ChemComp-FK2 / |
#3: 化合物 | ChemComp-NAP / |
#4: 水 | ChemComp-HOH / |
研究の焦点であるリガンドがあるか | Y |
-実験情報
-実験
実験 | 手法: ![]() |
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試料調製
結晶 | マシュー密度: 3.66 Å3/Da / 溶媒含有率: 66.37 % |
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結晶化 | 温度: 289 K / 手法: 蒸気拡散法, ハンギングドロップ法 詳細: 1 M sodium malonate pH 5.0, 0.1 M sodium acetate trihydrate pH 4.5, and 3% PEG 20,000 |
-データ収集
回折 | 平均測定温度: 100 K / Serial crystal experiment: N |
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放射光源 | 由来: ![]() ![]() ![]() |
検出器 | タイプ: DECTRIS EIGER X 16M / 検出器: PIXEL / 日付: 2021年10月30日 |
放射 | プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray |
放射波長 | 波長: 0.97915 Å / 相対比: 1 |
反射 | 解像度: 2→44.91 Å / Num. obs: 65288 / % possible obs: 99.92 % / 冗長度: 38 % / CC1/2: 0.999 / Net I/σ(I): 19.95 |
反射 シェル | 解像度: 2→2.03 Å / Num. unique obs: 2754 / CC1/2: 0.813 |
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解析
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精密化 | 構造決定の手法: ![]() 開始モデル: 8HI4 解像度: 2→44.91 Å / SU ML: 0.18 / 交差検証法: THROUGHOUT / σ(F): 1.34 / 位相誤差: 20.08 / 立体化学のターゲット値: ML
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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 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
原子変位パラメータ | Biso max: 80.5 Å2 / Biso mean: 32.1632 Å2 / Biso min: 16.52 Å2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
精密化ステップ | サイクル: final / 解像度: 2→44.91 Å
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LS精密化 シェル | Refine-ID: X-RAY DIFFRACTION / Rfactor Rfree error: 0 / Total num. of bins used: 23
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