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2i46

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==Crystal structure of human TPP1==
==Crystal structure of human TPP1==
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<StructureSection load='2i46' size='340' side='right' caption='[[2i46]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
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<StructureSection load='2i46' size='340' side='right'caption='[[2i46]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[2i46]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2I46 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2I46 FirstGlance]. <br>
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<table><tr><td colspan='2'>[[2i46]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2I46 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2I46 FirstGlance]. <br>
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</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ACD, PIP1, PTOP ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.7&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2i46 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2i46 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2i46 RCSB], [http://www.ebi.ac.uk/pdbsum/2i46 PDBsum]</span></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2i46 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2i46 OCA], [https://pdbe.org/2i46 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2i46 RCSB], [https://www.ebi.ac.uk/pdbsum/2i46 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2i46 ProSAT]</span></td></tr>
</table>
</table>
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<div style="background-color:#fffaf0;">
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== Function ==
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== Publication Abstract from PubMed ==
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[https://www.uniprot.org/uniprot/ACD_HUMAN ACD_HUMAN] Component of the shelterin complex (telosome) that is involved in the regulation of telomere length and protection. Shelterin associates with arrays of double-stranded TTAGGG repeats added by telomerase and protects chromosome ends; without its protective activity, telomeres are no longer hidden from the DNA damage surveillance and chromosome ends are inappropriately processed by DNA repair pathways. Promotes binding of POT1 to single-stranded telomeric DNA. Modulates the inhibitory effects of POT1 on telomere elongation. The ACD-POT1 heterodimer enhances telomere elongation by increasing telomerase processivity. Plays a role in shelterin complex assembly. May play a role in organogenesis.<ref>PMID:15181449</ref> <ref>PMID:16166375</ref> <ref>PMID:16880378</ref> <ref>PMID:20231318</ref> <ref>PMID:17237768</ref>
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Telomeres were originally defined as chromosome caps that prevent the natural ends of linear chromosomes from undergoing deleterious degradation and fusion events. POT1 (protection of telomeres) protein binds the single-stranded G-rich DNA overhangs at human chromosome ends and suppresses unwanted DNA repair activities. TPP1 is a previously identified binding partner of POT1 that has been proposed to form part of a six-protein shelterin complex at telomeres. Here, the crystal structure of a domain of human TPP1 reveals an oligonucleotide/oligosaccharide-binding fold that is structurally similar to the beta-subunit of the telomere end-binding protein of a ciliated protozoan, suggesting that TPP1 is the missing beta-subunit of human POT1 protein. Telomeric DNA end-binding proteins have generally been found to inhibit rather than stimulate the action of the chromosome end-replicating enzyme, telomerase. In contrast, we find that TPP1 and POT1 form a complex with telomeric DNA that increases the activity and processivity of the human telomerase core enzyme. We propose that POT1-TPP1 switches from inhibiting telomerase access to the telomere, as a component of shelterin, to serving as a processivity factor for telomerase during telomere extension.
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The POT1-TPP1 telomere complex is a telomerase processivity factor.,Wang F, Podell ER, Zaug AJ, Yang Y, Baciu P, Cech TR, Lei M Nature. 2007 Feb 1;445(7127):506-10. Epub 2007 Jan 21. PMID:17237768<ref>PMID:17237768</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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== References ==
== References ==
<references/>
<references/>
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</StructureSection>
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Baciu, P.]]
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[[Category: Large Structures]]
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[[Category: Cech, T R.]]
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[[Category: Baciu P]]
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[[Category: Else, T.]]
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[[Category: Cech TR]]
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[[Category: Hammer, G D.]]
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[[Category: Else T]]
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[[Category: Lei, M.]]
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[[Category: Hammer GD]]
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[[Category: Podell, E R.]]
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[[Category: Lei M]]
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[[Category: Wang, F.]]
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[[Category: Podell ER]]
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[[Category: Yang, Y T.]]
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[[Category: Wang F]]
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[[Category: Zaug, A J.]]
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[[Category: Yang YT]]
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[[Category: Ob fold]]
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[[Category: Zaug AJ]]
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[[Category: Pot1 binding]]
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[[Category: Protein binding]]
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[[Category: Tpp1]]
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Current revision

Crystal structure of human TPP1

PDB ID 2i46

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