|
|
| (One intermediate revision not shown.) |
| Line 3: |
Line 3: |
| | <SX load='6d6v' size='340' side='right' viewer='molstar' caption='[[6d6v]], [[Resolution|resolution]] 4.80Å' scene=''> | | <SX load='6d6v' size='340' side='right' viewer='molstar' caption='[[6d6v]], [[Resolution|resolution]] 4.80Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6d6v]] is a 8 chain structure with sequence from [http://en.wikipedia.org/wiki/Tetrahymena_thermophila Tetrahymena thermophila]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6D6V OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6D6V FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6d6v]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Tetrahymena_thermophila Tetrahymena thermophila]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6D6V OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6D6V FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 4.8Å</td></tr> |
| - | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=UNK:UNKNOWN'>UNK</scene></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/RNA-directed_DNA_polymerase RNA-directed DNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.49 2.7.7.49] </span></td></tr>
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6d6v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6d6v OCA], [https://pdbe.org/6d6v PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6d6v RCSB], [https://www.ebi.ac.uk/pdbsum/6d6v PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6d6v ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6d6v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6d6v OCA], [http://pdbe.org/6d6v PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6d6v RCSB], [http://www.ebi.ac.uk/pdbsum/6d6v PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6d6v ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/TERT_TETTH TERT_TETTH]] Telomerase is a ribonucleoprotein enzyme essential for the replication of chromosome termini in most eukaryotes. It elongates telomeres. It is a reverse transcriptase that adds simple sequence repeats to chromosome ends by copying a template sequence within the RNA component of the enzyme (By similarity). | + | [https://www.uniprot.org/uniprot/TERT_TETTS TERT_TETTS] Catalytic component of telomerase, an essential ribonucleoprotein enzyme that copies new telomeric repeats onto chromosome ends by repetitively synthesizing the short telomere-repeat sequence 5'-TTGGGG-3' using an RNA template component TER (PubMed:10944124, PubMed:15696174, PubMed:16462747, PubMed:17322903, PubMed:20713447). TERT is a reverse transcriptase that adds simple sequence repeats to chromosome ends by copying a template sequence within the RNA component of the enzyme (PubMed:10944124, PubMed:15696174, PubMed:16462747, PubMed:17322903, PubMed:20713447).<ref>PMID:10944124</ref> <ref>PMID:15696174</ref> <ref>PMID:16462747</ref> <ref>PMID:17322903</ref> <ref>PMID:20713447</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
| Line 22: |
Line 21: |
| | | | |
| | ==See Also== | | ==See Also== |
| - | *[[Telomerase|Telomerase]] | + | *[[Telomerase 3D structures|Telomerase 3D structures]] |
| | *[[Telomerase-associated protein|Telomerase-associated protein]] | | *[[Telomerase-associated protein|Telomerase-associated protein]] |
| | == References == | | == References == |
| Line 29: |
Line 28: |
| | </SX> | | </SX> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: RNA-directed DNA polymerase]] | |
| | [[Category: Tetrahymena thermophila]] | | [[Category: Tetrahymena thermophila]] |
| - | [[Category: Basu, R]] | + | [[Category: Basu R]] |
| - | [[Category: Chan, H]] | + | [[Category: Chan H]] |
| - | [[Category: Feigon, J]] | + | [[Category: Feigon J]] |
| - | [[Category: Jiang, J]] | + | [[Category: Jiang J]] |
| - | [[Category: Susac, L]] | + | [[Category: Susac L]] |
| - | [[Category: Wang, Y]] | + | [[Category: Wang Y]] |
| - | [[Category: Zhou, Z H]] | + | [[Category: Zhou ZH]] |
| - | [[Category: Replication]]
| + | |
| - | [[Category: Telomerase]]
| + | |
| - | [[Category: Telomere]]
| + | |
| Structural highlights
Function
TERT_TETTS Catalytic component of telomerase, an essential ribonucleoprotein enzyme that copies new telomeric repeats onto chromosome ends by repetitively synthesizing the short telomere-repeat sequence 5'-TTGGGG-3' using an RNA template component TER (PubMed:10944124, PubMed:15696174, PubMed:16462747, PubMed:17322903, PubMed:20713447). TERT is a reverse transcriptase that adds simple sequence repeats to chromosome ends by copying a template sequence within the RNA component of the enzyme (PubMed:10944124, PubMed:15696174, PubMed:16462747, PubMed:17322903, PubMed:20713447).[1] [2] [3] [4] [5]
Publication Abstract from PubMed
Telomerase is an RNA-protein complex (RNP) that extends telomeric DNA at the 3' ends of chromosomes using its telomerase reverse transcriptase (TERT) and integral template-containing telomerase RNA (TER). Its activity is a critical determinant of human health, affecting aging, cancer, and stem cell renewal. Lack of atomic models of telomerase, particularly one with DNA bound, has limited our mechanistic understanding of telomeric DNA repeat synthesis. We report the 4.8 A resolution cryoelectron microscopy structure of active Tetrahymena telomerase bound to telomeric DNA. The catalytic core is an intricately interlocked structure of TERT and TER, including a previously structurally uncharacterized TERT domain that interacts with the TEN domain to physically enclose TER and regulate activity. This complete structure of a telomerase catalytic core and its interactions with telomeric DNA from the template to telomere-interacting p50-TEB complex provides unanticipated insights into telomerase assembly and catalytic cycle and a new paradigm for a reverse transcriptase RNP.
Structure of Telomerase with Telomeric DNA.,Jiang J, Wang Y, Susac L, Chan H, Basu R, Zhou ZH, Feigon J Cell. 2018 May 17;173(5):1179-1190.e13. doi: 10.1016/j.cell.2018.04.038. PMID:29775593[6]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Miller MC, Liu JK, Collins K. Template definition by Tetrahymena telomerase reverse transcriptase. EMBO J. 2000 Aug 15;19(16):4412-22. PMID:10944124 doi:10.1093/emboj/19.16.4412
- ↑ Prathapam R, Witkin KL, O'Connor CM, Collins K. A telomerase holoenzyme protein enhances telomerase RNA assembly with telomerase reverse transcriptase. Nat Struct Mol Biol. 2005 Mar;12(3):252-7. doi: 10.1038/nsmb900. Epub 2005 Feb 6. PMID:15696174 doi:http://dx.doi.org/10.1038/nsmb900
- ↑ Jacobs SA, Podell ER, Cech TR. Crystal structure of the essential N-terminal domain of telomerase reverse transcriptase. Nat Struct Mol Biol. 2006 Mar;13(3):218-25. Epub 2006 Feb 5. PMID:16462747 doi:10.1038/nsmb1054
- ↑ Stone MD, Mihalusova M, O'connor CM, Prathapam R, Collins K, Zhuang X. Stepwise protein-mediated RNA folding directs assembly of telomerase ribonucleoprotein. Nature. 2007 Mar 22;446(7134):458-61. doi: 10.1038/nature05600. Epub 2007 Feb 25. PMID:17322903 doi:http://dx.doi.org/10.1038/nature05600
- ↑ Berman AJ, Gooding AR, Cech TR. Tetrahymena telomerase protein p65 induces conformational changes throughout telomerase RNA (TER) and rescues telomerase reverse transcriptase and TER assembly mutants. Mol Cell Biol. 2010 Oct;30(20):4965-76. doi: 10.1128/MCB.00827-10. Epub 2010 Aug , 16. PMID:20713447 doi:http://dx.doi.org/10.1128/MCB.00827-10
- ↑ Jiang J, Wang Y, Susac L, Chan H, Basu R, Zhou ZH, Feigon J. Structure of Telomerase with Telomeric DNA. Cell. 2018 May 17;173(5):1179-1190.e13. doi: 10.1016/j.cell.2018.04.038. PMID:29775593 doi:http://dx.doi.org/10.1016/j.cell.2018.04.038
|
