View source for 7qjd


==Structure of recombinant human gamma-Tubulin Ring Complex without actin==
<StructureSection load='7qjd' size='340' side='right'caption='[[7qjd]], [[Resolution|resolution]] 7.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7qjd]] is a 42 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=7QJD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7QJD FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 7.1&#8491;</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=7qjd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7qjd OCA], [https://pdbe.org/7qjd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7qjd RCSB], [https://www.ebi.ac.uk/pdbsum/7qjd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7qjd ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TBG1_HUMAN TBG1_HUMAN] Tubulin is the major constituent of microtubules. The gamma chain is found at microtubule organizing centers (MTOC) such as the spindle poles or the centrosome. Pericentriolar matrix component that regulates alpha/beta chain minus-end nucleation, centrosome duplication and spindle formation.
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== Publication Abstract from PubMed ==
The gamma-tubulin ring complex (gamma-TuRC) is the principal microtubule nucleation template in vertebrates. Recent cryo-EM reconstructions visualized the intricate quaternary structure of the gamma-TuRC, containing more than thirty subunits, raising fundamental questions about gamma-TuRC assembly and the role of actin as an integral part of the complex. Here, we reveal the structural mechanism underlying modular gamma-TuRC assembly and identify a functional role of actin in microtubule nucleation. During gamma-TuRC assembly, a GCP6-stabilized core comprising GCP2-3-4-5-4-6 is expanded by stepwise recruitment, selective stabilization and conformational locking of four pre-formed GCP2-GCP3 units. Formation of the lumenal bridge specifies incorporation of the terminal GCP2-GCP3 unit and thereby leads to closure of the gamma-TuRC ring in a left-handed spiral configuration. Actin incorporation into the complex is not relevant for gamma-TuRC assembly and structural integrity, but determines gamma-TuRC geometry and is required for efficient microtubule nucleation and mitotic chromosome alignment in vivo.

Modular assembly of the principal microtubule nucleator gamma-TuRC.,Wurtz M, Zupa E, Atorino ES, Neuner A, Bohler A, Rahadian AS, Vermeulen BJA, Tonon G, Eustermann S, Schiebel E, Pfeffer S Nat Commun. 2022 Jan 25;13(1):473. doi: 10.1038/s41467-022-28079-0. PMID:35078983<ref>PMID:35078983</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 7qjd" style="background-color:#fffaf0;"></div>

==See Also==
*[[Tubulin 3D Structures|Tubulin 3D Structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Pfeffer S]]
[[Category: Zupa E]]