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-Structure paper
タイトル | Structure of Tetrahymena telomerase reveals previously unknown subunits, functions, and interactions. |
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ジャーナル・号・ページ | Science, Vol. 350, Issue 6260, Page aab4070, Year 2015 |
掲載日 | 2015年10月30日 |
著者 | Jiansen Jiang / Henry Chan / Darian D Cash / Edward J Miracco / Rachel R Ogorzalek Loo / Heather E Upton / Duilio Cascio / Reid O'Brien Johnson / Kathleen Collins / Joseph A Loo / Z Hong Zhou / Juli Feigon / |
PubMed 要旨 | Telomerase helps maintain telomeres by processive synthesis of telomere repeat DNA at their 3'-ends, using an integral telomerase RNA (TER) and telomerase reverse transcriptase (TERT). We report the ...Telomerase helps maintain telomeres by processive synthesis of telomere repeat DNA at their 3'-ends, using an integral telomerase RNA (TER) and telomerase reverse transcriptase (TERT). We report the cryo-electron microscopy structure of Tetrahymena telomerase at ~9 angstrom resolution. In addition to seven known holoenzyme proteins, we identify two additional proteins that form a complex (TEB) with single-stranded telomere DNA-binding protein Teb1, paralogous to heterotrimeric replication protein A (RPA). The p75-p45-p19 subcomplex is identified as another RPA-related complex, CST (CTC1-STN1-TEN1). This study reveals the paths of TER in the TERT-TER-p65 catalytic core and single-stranded DNA exit; extensive subunit interactions of the TERT essential N-terminal domain, p50, and TEB; and other subunit identities and structures, including p19 and p45C crystal structures. Our findings provide structural and mechanistic insights into telomerase holoenzyme function. |
リンク | Science / PubMed:26472759 / PubMed Central |
手法 | EM (単粒子) / X線回折 / NMR (溶液) |
解像度 | 2.301 - 9.4 Å |
構造データ | EMDB-6442: EMDB-6443: PDB-5dfm: PDB-5dfn: PDB-5kmz: |
化合物 | ChemComp-SO4: ChemComp-GOL: ChemComp-HOH: |
由来 |
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キーワード | NUCLEAR PROTEIN / Telomerase / P19 / CST complex / Ten1 / OB-fold / Oligonucleotide Binding Fold / P45 / Stn1 / Winged Helix / WH domain / WHtH / Winged Helix turn Helix / RNA / pseudoknot / triplex |