View source for 8vrk


==Rigid body fitted model for refined density map of gamma tubulin ring complex capped microtubule==
<StructureSection load='8vrk' size='340' side='right'caption='[[8vrk]], [[Resolution|resolution]] 8.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8vrk]] is a 60 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=8VRK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8VRK 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]] 8.5&#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=8vrk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8vrk OCA], [https://pdbe.org/8vrk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8vrk RCSB], [https://www.ebi.ac.uk/pdbsum/8vrk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8vrk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TBA1B_HUMAN TBA1B_HUMAN] Tubulin is the major constituent of microtubules. It binds two moles of GTP, one at an exchangeable site on the beta chain and one at a non-exchangeable site on the alpha chain.
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== Publication Abstract from PubMed ==
Microtubules are composed of alpha-tubulin and beta-tubulin dimers positioned head-to-tail to form protofilaments that associate laterally in varying numbers. It is not known how cellular microtubules assemble with the canonical 13-protofilament architecture, resulting in micrometer-scale alpha/beta-tubulin tracks for intracellular transport that align with, rather than spiral along, the long axis of the filament. We report that the human ~2.3 MDa gamma-tubulin ring complex (gamma-TuRC), an essential regulator of microtubule formation that contains 14 gamma-tubulins, selectively nucleates 13-protofilament microtubules. Cryogenic electron microscopy reconstructions of gamma-TuRC-capped microtubule minus ends reveal the extensive intra-domain and inter-domain motions of gamma-TuRC subunits that accommodate luminal bridge components and establish lateral and longitudinal interactions between gamma-tubulins and alpha-tubulins. Our structures suggest that gamma-TuRC, an inefficient nucleation template owing to its splayed conformation, can transform into a compacted cap at the microtubule minus end and set the lattice architecture of cellular microtubules.

Structure of the gamma-tubulin ring complex-capped microtubule.,Aher A, Urnavicius L, Xue A, Neselu K, Kapoor TM Nat Struct Mol Biol. 2024 Jul;31(7):1124-1133. doi: 10.1038/s41594-024-01264-z. , Epub 2024 Apr 12. PMID:38609661<ref>PMID:38609661</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Aher A]]
[[Category: Kapoor TM]]
[[Category: Urnavicius L]]