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基本情報
登録情報 | データベース: EMDB / ID: EMD-21149 | |||||||||
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タイトル | Cryo-EM structure of IRP2-FBXL5-SKP1 complex | |||||||||
![]() | IRP2-FBXL5-SKP1 complex | |||||||||
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![]() | E3 ligase / [2Fe-2S] cluster / Iron metabolism / LIGASE | |||||||||
機能・相同性 | ![]() aconitate hydratase activity / iron-responsive element binding / : / F-box domain binding / citrate metabolic process / PcG protein complex / protoporphyrinogen IX biosynthetic process / Cul7-RING ubiquitin ligase complex / positive regulation of ubiquitin protein ligase activity / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling ...aconitate hydratase activity / iron-responsive element binding / : / F-box domain binding / citrate metabolic process / PcG protein complex / protoporphyrinogen IX biosynthetic process / Cul7-RING ubiquitin ligase complex / positive regulation of ubiquitin protein ligase activity / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / maintenance of protein location in nucleus / intestinal absorption / erythrocyte homeostasis / SCF ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / Prolactin receptor signaling / protein monoubiquitination / Association of TriC/CCT with target proteins during biosynthesis / cullin family protein binding / ubiquitin-like ligase-substrate adaptor activity / protein K48-linked ubiquitination / Nuclear events stimulated by ALK signaling in cancer / ubiquitin ligase complex / translation repressor activity / tricarboxylic acid cycle / Regulation of BACH1 activity / MAP3K8 (TPL2)-dependent MAPK1/3 activation / osteoclast differentiation / post-embryonic development / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / molecular function activator activity / Vpu mediated degradation of CD4 / Dectin-1 mediated noncanonical NF-kB signaling / Degradation of GLI1 by the proteasome / Activation of NF-kappaB in B cells / Negative regulation of NOTCH4 signaling / Iron uptake and transport / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Degradation of GLI2 by the proteasome / GLI3 is processed to GLI3R by the proteasome / FBXL7 down-regulates AURKA during mitotic entry and in early mitosis / Degradation of beta-catenin by the destruction complex / NOTCH1 Intracellular Domain Regulates Transcription / CLEC7A (Dectin-1) signaling / beta-catenin binding / SCF(Skp2)-mediated degradation of p27/p21 / Constitutive Signaling by NOTCH1 PEST Domain Mutants / Constitutive Signaling by NOTCH1 HD+PEST Domain Mutants / 2 iron, 2 sulfur cluster binding / multicellular organismal-level iron ion homeostasis / FCERI mediated NF-kB activation / Interleukin-1 signaling / Orc1 removal from chromatin / protein polyubiquitination / positive regulation of protein catabolic process / ubiquitin-protein transferase activity / Regulation of RUNX2 expression and activity / Cyclin D associated events in G1 / Regulation of PLK1 Activity at G2/M Transition / Circadian Clock / Antigen processing: Ubiquitination & Proteasome degradation / Downstream TCR signaling / Neddylation / mitotic cell cycle / 4 iron, 4 sulfur cluster binding / iron ion transport / proteasome-mediated ubiquitin-dependent protein catabolic process / intracellular iron ion homeostasis / protein ubiquitination / chromatin remodeling / iron ion binding / protein domain specific binding / centrosome / perinuclear region of cytoplasm / mitochondrion / RNA binding / nucleoplasm / nucleus / metal ion binding / cytoplasm / cytosol 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: 3.0 Å | |||||||||
![]() | Wang H / Shi H | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: FBXL5 Regulates IRP2 Stability in Iron Homeostasis via an Oxygen-Responsive [2Fe2S] Cluster. 著者: Hui Wang / Hui Shi / Malini Rajan / Elizabeth R Canarie / Seoyeon Hong / Daniele Simoneschi / Michele Pagano / Matthew F Bush / Stefan Stoll / Elizabeth A Leibold / Ning Zheng / ![]() 要旨: Cellular iron homeostasis is dominated by FBXL5-mediated degradation of iron regulatory protein 2 (IRP2), which is dependent on both iron and oxygen. However, how the physical interaction between ...Cellular iron homeostasis is dominated by FBXL5-mediated degradation of iron regulatory protein 2 (IRP2), which is dependent on both iron and oxygen. However, how the physical interaction between FBXL5 and IRP2 is regulated remains elusive. Here, we show that the C-terminal substrate-binding domain of FBXL5 harbors a [2Fe2S] cluster in the oxidized state. A cryoelectron microscopy (cryo-EM) structure of the IRP2-FBXL5-SKP1 complex reveals that the cluster organizes the FBXL5 C-terminal loop responsible for recruiting IRP2. Interestingly, IRP2 binding to FBXL5 hinges on the oxidized state of the [2Fe2S] cluster maintained by ambient oxygen, which could explain hypoxia-induced IRP2 stabilization. Steric incompatibility also allows FBXL5 to physically dislodge IRP2 from iron-responsive element RNA to facilitate its turnover. Taken together, our studies have identified an iron-sulfur cluster within FBXL5, which promotes IRP2 polyubiquitination and degradation in response to both iron and oxygen concentrations. | |||||||||
履歴 |
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構造の表示
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構造ビューア | EMマップ: ![]() ![]() ![]() |
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マップデータ | ![]() | 8.2 MB | ![]() | |
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画像 | ![]() | 53.3 KB | ||
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-検証レポート
文書・要旨 | ![]() | 333.3 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 332.9 KB | 表示 | |
XML形式データ | ![]() | 6.5 KB | 表示 | |
CIF形式データ | ![]() | 7.4 KB | 表示 | |
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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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注釈 | IRP2-FBXL5-SKP1 complex | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.056 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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-添付データ
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試料の構成要素
-全体 : IRP2-FBLX5-SKP1 complex
全体 | 名称: IRP2-FBLX5-SKP1 complex |
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要素 |
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-超分子 #1: IRP2-FBLX5-SKP1 complex
超分子 | 名称: IRP2-FBLX5-SKP1 complex / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#3 |
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由来(天然) | 生物種: ![]() |
-分子 #1: Iron-responsive element binding protein 2, isoform CRA_a
分子 | 名称: Iron-responsive element binding protein 2, isoform CRA_a タイプ: protein_or_peptide / ID: 1 / コピー数: 1 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 105.165328 KDa |
組換発現 | 生物種: ![]() |
配列 | 文字列: MDAPKAGYAF EYLIETLNDS SHKKFFDVSK LGTKYDVLPY SIRVLLEAAV RNCDGFLMKK EDVMNILDWK TKQSNVEVPF FPARVLLQD FTGIPAMVDF AAMREAVKTL GGDPEKVHPA CPTDLTVDHS LQIDFSKCAI QNAPNPGGGD LQKAGKLSPL K VQPKKLPC ...文字列: MDAPKAGYAF EYLIETLNDS SHKKFFDVSK LGTKYDVLPY SIRVLLEAAV RNCDGFLMKK EDVMNILDWK TKQSNVEVPF FPARVLLQD FTGIPAMVDF AAMREAVKTL GGDPEKVHPA CPTDLTVDHS LQIDFSKCAI QNAPNPGGGD LQKAGKLSPL K VQPKKLPC RGQTTCRGSC DSGELGRNSG TFSSQIENTP ILCPFHLQPV PEPETVLKNQ EVEFGRNRER LQFFKWSSRV FK NVAVIPP GTGMAHQINL EYLSRVVFEE KDLLFPDSVV GTDSHITMVN GLGILGWGVG GIETEAVMLG LPVSLTLPEV VGC ELTGSS NPFVTSIDVV LGITKHLRQV GVAGKFVEFF GSGVSQLSIV DRTTIANMCP EYGAILSFFP VDNVTLKHLE HTGF SKAKL ESMETYLKAV KLFRNDQNSS GEPEYSQVIQ INLNSIVPSV SGPKRPQDRV AVTDMKSDFQ ACLNEKVGFK GFQIA AEKQ KDIVSIHYEG SEYKLSHGSV VIAAVISCTN NCNPSVMLAA GLLAKKAVEA GLRVKPYIRT SLSPGSGMVT HYLSSS GVL PYLSKLGFEI VGYGCSTCVG NTAPLSDAVL NAVKQGDLVT CGILSGNKNF EGRLCDCVRA NYLASPPLVV AYAIAGT VN IDFQTEPLGT DPTGKNIYLH DIWPSREEVH RVEEEHVILS MFKALKDKIE MGNKRWNSLE APDSVLFPWD LKSTYIRC P SFFDKLTKEP IALQAIENAH VLLYLGDSVT TDHISPAGSI ARNSAAAKYL TNRGLTPREF NSYGARRGND AVMTRGTFA NIKLFNKFIG KPAPKTIHFP SGQTLDVFEA AELYQKEGIP LIILAGKKYG SGNSRDWAAK GPYLLGVKAV LAESYEKIHK DHLIGIGIA PLQFLPGENA DSLGLSGRET FSLTFPEELS PGITLNIQTS TGKVFSVIAS FEDDVEITLY KHGGLLNFVA R KFS UniProtKB: Iron-responsive element-binding protein 2 |
-分子 #2: F-box/LRR-repeat protein 5
分子 | 名称: F-box/LRR-repeat protein 5 / タイプ: protein_or_peptide / ID: 2 / コピー数: 1 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 54.832441 KDa |
組換発現 | 生物種: ![]() ![]() |
配列 | 文字列: EHSTGITHLP PEVMLSIFSY LNPQELCRCS QVSMKWSQLT KTGSLWKHLY PVHWARGDWY SGPATELDTE PDDEWVKNRK DESRAFHEW DEDADIDESE ESAEESIAIS IAQMEKRLLH GLIHNVLPYV GTSVKTLVLA YSSAVSSKMV RQILELCPNL E HLDLTQTD ...文字列: EHSTGITHLP PEVMLSIFSY LNPQELCRCS QVSMKWSQLT KTGSLWKHLY PVHWARGDWY SGPATELDTE PDDEWVKNRK DESRAFHEW DEDADIDESE ESAEESIAIS IAQMEKRLLH GLIHNVLPYV GTSVKTLVLA YSSAVSSKMV RQILELCPNL E HLDLTQTD ISDSAFDSWS WLGCCQSLRH LDLSGCEKIT DVALEKISRA LGILTSHQSG FLKTSTSKIT STAWKNKDIT MQ STKQYAC LHDLTNKGIG EEIDNEHPWT KPVSSENFTS PYVWMLDAED LADIEDTVEW RHRNVESLCV METASNFSCS TSG CFSKDI VGLRTSVCWQ QHCASPAFAY CGHSFCCTGT ALRTMSSLPE SSAMCRKAAR TRLPRGKDLI YFGSEKSDQE TGRV LLFLS LSGCYQITDH GLRVLTLGGG LPYLEHLNLS GCLTITGAGL QDLVSACPSL NDEYFYYCDN INGPHADTAS GCQNL QCGF RACCRSGE UniProtKB: F-box/LRR-repeat protein 5 |
-分子 #3: S-phase kinase-associated protein 1
分子 | 名称: S-phase kinase-associated protein 1 / タイプ: protein_or_peptide / ID: 3 / コピー数: 1 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 18.679965 KDa |
組換発現 | 生物種: ![]() ![]() |
配列 | 文字列: MPSIKLQSSD GEIFEVDVEI AKQSVTIKTM LEDLGMDDEG DDDPVPLPNV NAAILKKVIQ WCTHHKDDPP PPEDDENKEK RTDDIPVWD QEFLKVDQGT LFELILAANY LDIKGLLDVT CKTVANMIKG KTPEEIRKTF NIKNDFTEEE EAQVRKENQW C EEK UniProtKB: S-phase kinase-associated protein 1 |
-分子 #4: FE2/S2 (INORGANIC) CLUSTER
分子 | 名称: FE2/S2 (INORGANIC) CLUSTER / タイプ: ligand / ID: 4 / コピー数: 1 / 式: FES |
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分子量 | 理論値: 175.82 Da |
Chemical component information | ![]() ChemComp-FES: |
-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: 8 |
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グリッド | 詳細: unspecified |
凍結 | 凍結剤: ETHANE |
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電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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撮影 | フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 平均電子線量: 73.8 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: OTHER / 撮影モード: BRIGHT FIELD |
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 / In silico モデル: generated by relion |
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最終 再構成 | 想定した対称性 - 点群: C1 (非対称) / 解像度のタイプ: BY AUTHOR / 解像度: 3.0 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 使用した粒子像数: 955060 |
初期 角度割当 | タイプ: MAXIMUM LIKELIHOOD |
最終 角度割当 | タイプ: MAXIMUM LIKELIHOOD |