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1z5w

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[[Image:1z5w.gif|left|200px]]
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{{Seed}}
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[[Image:1z5w.png|left|200px]]
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{{STRUCTURE_1z5w| PDB=1z5w | SCENE= }}
{{STRUCTURE_1z5w| PDB=1z5w | SCENE= }}
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'''Crystal Structure of gamma-tubulin bound to GTP'''
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===Crystal Structure of gamma-tubulin bound to GTP===
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==Overview==
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Microtubules are hollow polymers of alphabeta-tubulin that show GTP-dependent assembly dynamics and comprise a critical part of the eukaryotic cytoskeleton. Initiation of new microtubules in vivo requires gamma-tubulin, organized as an oligomer within the 2.2-MDa gamma-tubulin ring complex (gamma-TuRC) of higher eukaryotes. Structural insight is lacking regarding gamma-tubulin, its oligomerization and how it promotes microtubule assembly. Here we report the 2.7-A crystal structure of human gamma-tubulin bound to GTP-gammaS (a non-hydrolysable GTP analogue). We observe a 'curved' conformation for gamma-tubulin-GTPgammaS, similar to that seen for GDP-bound, unpolymerized alphabeta-tubulin. Tubulins are thought to represent a distinct class of GTP-binding proteins, and conformational switching in gamma-tubulin might differ from the nucleotide-dependent switching of signalling GTPases. A crystal packing interaction replicates the lateral contacts between alpha- and beta-tubulins in the microtubule, and this association probably forms the basis for gamma-tubulin oligomerization within the gamma-TuRC. Laterally associated gamma-tubulins in the gamma-TuRC might promote microtubule nucleation by providing a template that enhances the intrinsically weak lateral interaction between alphabeta-tubulin heterodimers. Because they are dimeric, alphabeta-tubulins cannot form microtubule-like lateral associations in the curved conformation. The lateral array of gamma-tubulins we observe in the crystal reveals a unique functional property of a monomeric tubulin.
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The line below this paragraph, {{ABSTRACT_PUBMED_15917813}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 15917813 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15917813}}
==About this Structure==
==About this Structure==
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[[Category: Stearns, T.]]
[[Category: Stearns, T.]]
[[Category: Complex with gtp]]
[[Category: Complex with gtp]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 17:12:32 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 09:44:24 2008''

Revision as of 06:44, 29 July 2008

Image:1z5w.png

Template:STRUCTURE 1z5w

Crystal Structure of gamma-tubulin bound to GTP

Template:ABSTRACT PUBMED 15917813

About this Structure

1Z5W is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Insights into microtubule nucleation from the crystal structure of human gamma-tubulin., Aldaz H, Rice LM, Stearns T, Agard DA, Nature. 2005 May 26;435(7041):523-7. PMID:15917813

Page seeded by OCA on Tue Jul 29 09:44:24 2008

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