+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 7ock | ||||||
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タイトル | MAT in complex with SAMH | ||||||
要素 |
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キーワード | HYDROLASE / enzyme filamentation / metabolic regulation / phage-host interaction / Cryo-EM | ||||||
機能・相同性 | 機能・相同性情報 S-adenosyl-L-methionine lyase / S-adenosyl-L-methionine lyase activity / methionine adenosyltransferase / methionine adenosyltransferase activity / S-adenosylmethionine biosynthetic process / one-carbon metabolic process / transferase activity / magnesium ion binding / ATP binding / cytoplasm 類似検索 - 分子機能 | ||||||
生物種 | Escherichia coli (大腸菌) Escherichia virus T3 (ウイルス) | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.6 Å | ||||||
データ登録者 | Simon, H. / Kleiner, D. / Shmulevich, F. / Zarivach, R. / Zalk, R. / Tang, H. / Ding, F. / Bershtein, S. | ||||||
資金援助 | イスラエル, 1件
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引用 | ジャーナル: mBio / 年: 2021 タイトル: SAMase of Bacteriophage T3 Inactivates Escherichia coli's Methionine -Adenosyltransferase by Forming Heteropolymers. 著者: Hadas Simon-Baram / Daniel Kleiner / Fannia Shmulevich / Raz Zarivach / Ran Zalk / Huayuan Tang / Feng Ding / Shimon Bershtein / 要旨: -Adenosylmethionine lyase (SAMase) of bacteriophage T3 degrades the intracellular SAM pools of the host Escherichia coli cells, thereby inactivating a crucial metabolite involved in a plethora of ...-Adenosylmethionine lyase (SAMase) of bacteriophage T3 degrades the intracellular SAM pools of the host Escherichia coli cells, thereby inactivating a crucial metabolite involved in a plethora of cellular functions, including DNA methylation. SAMase is the first viral protein expressed upon infection, and its activity prevents methylation of the T3 genome. Maintenance of the phage genome in a fully unmethylated state has a profound effect on the infection strategy. It allows T3 to shift from a lytic infection under normal growth conditions to a transient lysogenic infection under glucose starvation. Using single-particle cryoelectron microscopy (cryo-EM) and biochemical assays, we demonstrate that SAMase performs its function by not only degrading SAM but also by interacting with and efficiently inhibiting the host's methionine -adenosyltransferase (MAT), the enzyme that produces SAM. Specifically, SAMase triggers open-ended head-to-tail assembly of E. coli MAT into an unusual linear filamentous structure in which adjacent MAT tetramers are joined by two SAMase dimers. Molecular dynamics simulations together with normal mode analyses suggest that the entrapment of MAT tetramers within filaments leads to an allosteric inhibition of MAT activity due to a shift to low-frequency, high-amplitude active-site-deforming modes. The amplification of uncorrelated motions between active-site residues weakens MAT's substrate binding affinity, providing a possible explanation for the observed loss of function. We propose that the dual function of SAMase as an enzyme that degrades SAM and as an inhibitor of MAT activity has emerged to achieve an efficient depletion of the intracellular SAM pools. Self-assembly of enzymes into filamentous structures in response to specific metabolic cues has recently emerged as a widespread strategy of metabolic regulation. In many instances, filamentation of metabolic enzymes occurs in response to starvation and leads to functional inactivation. Here, we report that bacteriophage T3 modulates the metabolism of the host E. coli cells by recruiting a similar strategy: silencing a central metabolic enzyme by subjecting it to phage-mediated polymerization. This observation points to an intriguing possibility that virus-induced polymerization of the host metabolic enzymes is a common mechanism implemented by viruses to metabolically reprogram and subdue infected cells. | ||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 7ock.cif.gz | 604.3 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb7ock.ent.gz | 509.7 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 7ock.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 7ock_validation.pdf.gz | 940.6 KB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 7ock_full_validation.pdf.gz | 1.1 MB | 表示 | |
XML形式データ | 7ock_validation.xml.gz | 116.1 KB | 表示 | |
CIF形式データ | 7ock_validation.cif.gz | 172.3 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/oc/7ock ftp://data.pdbj.org/pub/pdb/validation_reports/oc/7ock | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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1 |
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-要素
#1: タンパク質 | 分子量: 42827.375 Da / 分子数: 8 / 由来タイプ: 組換発現 由来: (組換発現) Escherichia coli (strain K12) (大腸菌) 株: K12 / 遺伝子: metK, FAZ83_06105 / 発現宿主: Escherichia coli BL21(DE3) (大腸菌) / 参照: UniProt: A0A4S5B2W6, methionine adenosyltransferase #2: タンパク質 | 分子量: 17863.264 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) Escherichia virus T3 (ウイルス) / 発現宿主: Escherichia coli (大腸菌) / 株 (発現宿主): Z1 / 参照: UniProt: P07693 Has protein modification | Y | |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
-試料調製
構成要素 |
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由来(天然) |
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由来(組換発現) |
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緩衝液 | pH: 8 / 詳細: 25mM Tris pH 8.0, 150 mM KCl,1 mM DTT. | ||||||||||||||||||||||||
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | ||||||||||||||||||||||||
急速凍結 | 凍結剤: ETHANE |
-電子顕微鏡撮影
実験機器 | モデル: Tecnai Polara / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI POLARA 300 |
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
電子レンズ | モード: BRIGHT FIELD |
撮影 | 電子線照射量: 80 e/Å2 フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) |
-解析
ソフトウェア | 名称: PHENIX / バージョン: dev_3689: / 分類: 精密化 | ||||||||||||||||||||||||
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CTF補正 | タイプ: NONE | ||||||||||||||||||||||||
3次元再構成 | 解像度: 3.6 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 65950 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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