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データを開く
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基本情報
登録情報 | ![]() | |||||||||
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タイトル | Composite map of human PNPase in open form | |||||||||
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![]() | 3'-to-5' exoribonuclease / RNA degradation / RNA import / mitochondria / RNA BINDING PROTEIN | |||||||||
機能・相同性 | ![]() RNA import into mitochondrion / mitochondrial mRNA polyadenylation / mitochondrial degradosome / mitochondrial mRNA catabolic process / positive regulation of mitochondrial RNA catabolic process / mitochondrial RNA 3'-end processing / Mitochondrial RNA degradation / positive regulation of miRNA catabolic process / mitochondrial RNA 5'-end processing / poly(G) binding ...RNA import into mitochondrion / mitochondrial mRNA polyadenylation / mitochondrial degradosome / mitochondrial mRNA catabolic process / positive regulation of mitochondrial RNA catabolic process / mitochondrial RNA 3'-end processing / Mitochondrial RNA degradation / positive regulation of miRNA catabolic process / mitochondrial RNA 5'-end processing / poly(G) binding / polyribonucleotide nucleotidyltransferase / polyribonucleotide nucleotidyltransferase activity / nuclear polyadenylation-dependent mRNA catabolic process / mitochondrial RNA catabolic process / exosome (RNase complex) / positive regulation of mRNA catabolic process / regulation of cellular senescence / rRNA import into mitochondrion / regulation of cellular respiration / response to growth hormone / RNA catabolic process / miRNA binding / poly(U) RNA binding / protein homotrimerization / mRNA catabolic process / cellular response to interferon-beta / response to cAMP / liver regeneration / mitochondrion organization / protein homooligomerization / mitochondrial intermembrane space / mRNA processing / 3'-5'-RNA exonuclease activity / cellular response to oxidative stress / ribosome / mitochondrial matrix / endoplasmic reticulum membrane / mitochondrion / RNA binding / identical protein binding / cytosol / cytoplasm 類似検索 - 分子機能 | |||||||||
生物種 | ![]() | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.86 Å | |||||||||
![]() | Li YC / Yuan HS | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural insights into human PNPase in health and disease. 著者: Yi-Ching Li / Chun-Hsiung Wang / Malay Patra / Yi-Ping Chen / Wei-Zen Yang / Hanna S Yuan / ![]() 要旨: Human polynucleotide phosphorylase (hPNPase) is a 3'-to-5' exoribonuclease located in mitochondria, where it plays crucial roles in RNA degradation and RNA import. Mutations in hPNPase can impair ...Human polynucleotide phosphorylase (hPNPase) is a 3'-to-5' exoribonuclease located in mitochondria, where it plays crucial roles in RNA degradation and RNA import. Mutations in hPNPase can impair these functions, leading to various mitochondrial dysfunctions and diseases. However, the mechanisms by which hPNPase switches between its roles as an RNA-degrading enzyme and an RNA carrier, as well as how disease-associated mutations may affect these distinct functions, remain unclear. In this study, we present cryo-electron microscopy structures of hPNPase, highlighting the flexibility of its S1 domains, which cap the ring-like RNA-degradation chamber and shift between two distinctive open and closed conformations. We further demonstrate by small-angle X-ray scattering and biochemical analyses that the disease-associated mutations P467S and G499R impair hPNPase's stem-loop RNA-binding and degradation activities by limiting the S1 domain's ability to transition from an open to closed state. Conversely, the D713Y mutation, located within the S1 domain, does not affect the RNA-binding affinity of hPNPase, but diminishes its interaction with Suv3 helicase for cooperative degradation of structured RNA. Collectively, these findings underscore the critical role of S1 domain mobility in capturing structured RNA for degradation and import, as well as its involvement in mitochondrial degradosome assembly. Our study thereby reveals the molecular mechanism of hPNPase in RNA binding and degradation, and the multiple molecular defects that could be induced by disease-linked mutations in hPNPase. | |||||||||
履歴 |
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構造の表示
添付画像 |
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ダウンロードとリンク
-EMDBアーカイブ
マップデータ | ![]() | 5.6 MB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 10.6 KB 10.6 KB | 表示 表示 | ![]() |
画像 | ![]() | 136.9 KB | ||
Filedesc metadata | ![]() | 5.6 KB | ||
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 9kjrMC ![]() 9kjtC C: 同じ文献を引用 ( M: このマップから作成された原子モデル |
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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
EMDBのページ | ![]() ![]() |
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「今月の分子」の関連する項目 |
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マップ
ファイル | ![]() | ||||||||||||||||||||||||||||||||||||
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投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 0.83 Å | ||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
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-添付データ
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試料の構成要素
-全体 : Human PNPase in open form
全体 | 名称: Human PNPase in open form |
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要素 |
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-超分子 #1: Human PNPase in open form
超分子 | 名称: Human PNPase in open form / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all |
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由来(天然) | 生物種: ![]() |
-分子 #1: Polyribonucleotide nucleotidyltransferase 1, mitochondrial
分子 | 名称: Polyribonucleotide nucleotidyltransferase 1, mitochondrial タイプ: protein_or_peptide / ID: 1 / コピー数: 3 / 光学異性体: LEVO / EC番号: polyribonucleotide nucleotidyltransferase |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 78.007211 KDa |
組換発現 | 生物種: ![]() ![]() |
配列 | 文字列: MGAVAVDLGN RKLEISSGKL ARFADGSAVV QSGDTAVMVT AVSKTKPSPS QFMPLVVDYR QKAAAAGRIP TNYLRREVGT SDKEILTSR IIDRSIRPLF PAGYFYDTQV LCNLLAVDGV NEPDVLAING ASVALSLSDI PWNGPVGAVR IGIIDGEYVV N PTRKEMSS ...文字列: MGAVAVDLGN RKLEISSGKL ARFADGSAVV QSGDTAVMVT AVSKTKPSPS QFMPLVVDYR QKAAAAGRIP TNYLRREVGT SDKEILTSR IIDRSIRPLF PAGYFYDTQV LCNLLAVDGV NEPDVLAING ASVALSLSDI PWNGPVGAVR IGIIDGEYVV N PTRKEMSS STLNLVVAGA PKSQIVMLEA SAENILQQDF CHAIKVGVKY TQQIIQGIQQ LVKETGVTKR TPQKLFTPSP EI VKYTHKL AMERLYAVFT DYEHDKVSRD EAVNKIRLDT EEQLKEKFPE ADPYEIIESF NVVAKEVFRS IVLNEYKRCD GRD LTSLRN VSCEVDMFKT LHGSALFQRG QTQVLCTVTF DSLESGIKSD QVITAINGIK DKNFMLHYEF PPYATNEIGK VTGL NRREL GHGALAEKAL YPVIPRDFPF TIRVTSEVLE SNGSSSMASA CGGSLALMDS GVPISSAVAG VAIGLVTKTD PEKGE IEDY RLLTDILGIE DYNGDMDFKI AGTNKGITAL QADIKLPGIP IKIVMEAIQQ ASVAKKEILQ IMNKTISKPR ASRKEN GPV VETVQVPLSK RAKFVGPGGY NLKKLQAETG VTISQVDEET FSVFAPTPSA MHEARDFITE ICKDDQEQQL EFGAVYT AT ITEIRDTGVM VKLYPNMTAV LLHNTQLDQR KIKHPTALGL EVGQEIQVKY FGRDPADGRM RLSRKVLQ UniProtKB: Polyribonucleotide nucleotidyltransferase 1, mitochondrial |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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![]() | 単粒子再構成法 |
試料の集合状態 | particle |
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試料調製
緩衝液 | pH: 7.4 |
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凍結 | 凍結剤: ETHANE |
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電子顕微鏡法
顕微鏡 | TFS KRIOS |
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撮影 | フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 平均電子線量: 50.0 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2.0 µm / 最小 デフォーカス(公称値): 1.6 µm |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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画像解析
初期モデル | モデルのタイプ: INSILICO MODEL |
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最終 再構成 | 解像度のタイプ: BY AUTHOR / 解像度: 3.86 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 使用した粒子像数: 91100 |
初期 角度割当 | タイプ: MAXIMUM LIKELIHOOD |
最終 角度割当 | タイプ: MAXIMUM LIKELIHOOD |