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基本情報
登録情報 | データベース: PDB / ID: 8dd7 | ||||||
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タイトル | The Cryo-EM structure of Drosophila Cryptochrome in complex with Timeless | ||||||
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![]() | CIRCADIAN CLOCK PROTEIN / Flavoprotein / Nuclear import / Light-sensor / Armadillo-repeat protein | ||||||
機能・相同性 | ![]() Nuclear import of PER and TIM / Dephosphorylation of TIM / circadian regulation of heart rate / negative phototaxis / UV-A, blue light phototransduction / regulation of circadian sleep/wake cycle / magnetoreception / detection of light stimulus involved in magnetoreception / photoperiodism / eclosion rhythm ...Nuclear import of PER and TIM / Dephosphorylation of TIM / circadian regulation of heart rate / negative phototaxis / UV-A, blue light phototransduction / regulation of circadian sleep/wake cycle / magnetoreception / detection of light stimulus involved in magnetoreception / photoperiodism / eclosion rhythm / Transcription repression by PER and activation by PDP1 / Dephosphorylation of PER / gravitaxis / Phosphorylation of PER and TIM / copulation / Degradation of CRY / Degradation of TIM / circadian temperature homeostasis / rhythmic behavior / blue light signaling pathway / methylated-DNA-[protein]-cysteine S-methyltransferase / methylated-DNA-[protein]-cysteine S-methyltransferase activity / regulation of protein import into nucleus / response to magnetism / replication fork arrest / response to blue light / regulation of circadian sleep/wake cycle, sleep / cellular response to light stimulus / blue light photoreceptor activity / entrainment of circadian clock / DNA replication checkpoint signaling / regulation of phagocytosis / replication fork protection complex / circadian behavior / mating behavior / entrainment of circadian clock by photoperiod / locomotor rhythm / response to light stimulus / photoreceptor activity / phototransduction / positive regulation of phagocytosis / FAD binding / circadian regulation of gene expression / regulation of circadian rhythm / circadian rhythm / flavin adenine dinucleotide binding / methylation / DNA repair / negative regulation of DNA-templated transcription / perinuclear region of cytoplasm / DNA binding / nucleoplasm / metal ion binding / nucleus / cytosol / cytoplasm 類似検索 - 分子機能 | ||||||
生物種 | ![]() ![]() ![]() | ||||||
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: 3.3 Å | ||||||
![]() | Feng, S. / Lin, C. / DeOliveira, C.C. / Crane, B.R. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Cryptochrome-Timeless structure reveals circadian clock timing mechanisms. 著者: Changfan Lin / Shi Feng / Cristina C DeOliveira / Brian R Crane / ![]() 要旨: Circadian rhythms influence many behaviours and diseases. They arise from oscillations in gene expression caused by repressor proteins that directly inhibit transcription of their own genes. The fly ...Circadian rhythms influence many behaviours and diseases. They arise from oscillations in gene expression caused by repressor proteins that directly inhibit transcription of their own genes. The fly circadian clock offers a valuable model for studying these processes, wherein Timeless (Tim) plays a critical role in mediating nuclear entry of the transcriptional repressor Period (Per) and the photoreceptor Cryptochrome (Cry) entrains the clock by triggering Tim degradation in light. Here, through cryogenic electron microscopy of the Cry-Tim complex, we show how a light-sensing cryptochrome recognizes its target. Cry engages a continuous core of amino-terminal Tim armadillo repeats, resembling how photolyases recognize damaged DNA, and binds a C-terminal Tim helix, reminiscent of the interactions between light-insensitive cryptochromes and their partners in mammals. The structure highlights how the Cry flavin cofactor undergoes conformational changes that couple to large-scale rearrangements at the molecular interface, and how a phosphorylated segment in Tim may impact clock period by regulating the binding of Importin-α and the nuclear import of Tim-Per. Moreover, the structure reveals that the N terminus of Tim inserts into the restructured Cry pocket to replace the autoinhibitory C-terminal tail released by light, thereby providing a possible explanation for how the long-short Tim polymorphism adapts flies to different climates. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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PDBx/mmCIF形式 | ![]() | 265.3 KB | 表示 | ![]() |
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PDB形式 | ![]() | 195.3 KB | 表示 | ![]() |
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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 | ![]() 27335MC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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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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要素
#1: タンパク質 | 分子量: 83838.617 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() ![]() Cell (発現宿主): S2 cell 発現宿主: ![]() ![]() 参照: UniProt: E5BBQ0, UniProt: O77059 |
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#2: タンパク質 | 分子量: 179996.109 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() ![]() Cell (発現宿主): S2 cell 発現宿主: ![]() ![]() 参照: UniProt: P49021, UniProt: E5BBQ0, methylated-DNA-[protein]-cysteine S-methyltransferase |
#3: 化合物 | ChemComp-FAD / |
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: 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 |
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試料調製
構成要素 | 名称: Complex of Drosophila Cryptochrome and Timeless / タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 値: 0.264 MDa / 実験値: YES |
由来(天然) | 生物種: ![]() ![]() |
由来(組換発現) | 生物種: ![]() ![]() |
緩衝液 | pH: 8 |
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-PROPANE |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Talos Arctica / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TALOS ARCTICA |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 800 nm |
撮影 | 電子線照射量: 53 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) |
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解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3次元再構成 | 解像度: 3.3 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 160000 / 対称性のタイプ: POINT |