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-Structure paper
タイトル | Structure of active dimeric human telomerase. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 20, Issue 4, Page 454-460, Year 2013 |
掲載日 | 2013年3月10日 |
著者 | Anselm Sauerwald / Sara Sandin / Gaël Cristofari / Sjors H W Scheres / Joachim Lingner / Daniela Rhodes / |
PubMed 要旨 | Telomerase contains a large RNA subunit, TER, and a protein catalytic subunit, TERT. Whether telomerase functions as a monomer or dimer has been a matter of debate. Here we report biochemical and ...Telomerase contains a large RNA subunit, TER, and a protein catalytic subunit, TERT. Whether telomerase functions as a monomer or dimer has been a matter of debate. Here we report biochemical and labeling data that show that in vivo-assembled human telomerase contains two TERT subunits and binds two telomeric DNA substrates. Notably, catalytic activity requires both TERT active sites to be functional, which demonstrates that human telomerase functions as a dimer. We also present the three-dimensional structure of the active full-length human telomerase dimer, determined by single-particle EM in negative stain. Telomerase has a bilobal architecture with the two monomers linked by a flexible interface. The monomer reconstruction at 23-Å resolution and fitting of the atomic structure of the TERT subunit from beetle Tribolium castaneum into the EM density reveals the spatial relationship between RNA and protein subunits, providing insights into telomerase architecture. |
リンク | Nat Struct Mol Biol / PubMed:23474713 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 23.0 - 30.0 Å |
構造データ | EMDB-2310: EMDB-2311: EMDB-2312: |
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