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3j06

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==CryoEM Helical Reconstruction of TMV==
==CryoEM Helical Reconstruction of TMV==
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<StructureSection load='3j06' size='340' side='right' caption='[[3j06]], [[Resolution|resolution]] 3.30&Aring;' scene=''>
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<SX load='3j06' size='340' side='right' viewer='molstar' caption='[[3j06]], [[Resolution|resolution]] 3.30&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[3j06]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Tobacco_mosaic_virus_(vulgare) Tobacco mosaic virus (vulgare)]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3J06 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3J06 FirstGlance]. <br>
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<table><tr><td colspan='2'>[[3j06]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Tobacco_mosaic_virus_(vulgare) Tobacco mosaic virus (vulgare)]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3J06 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3J06 FirstGlance]. <br>
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</td></tr><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=3j06 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3j06 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3j06 RCSB], [http://www.ebi.ac.uk/pdbsum/3j06 PDBsum]</span></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">Electron Microscopy, [[Resolution|Resolution]] 3.3&#8491;</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=3j06 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3j06 OCA], [https://pdbe.org/3j06 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3j06 RCSB], [https://www.ebi.ac.uk/pdbsum/3j06 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3j06 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/CAPSD_TMV CAPSD_TMV] Capsid protein self-assembles to form rod-shaped virions about 18 nm in diameter with a central canal enclosing the viral genomic RNA.
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Helical assemblies such as filamentous viruses, flagella, and F-actin represent an important category of structures in biology. As the first discovered virus, tobacco mosaic virus (TMV) was at the center of virus research. Previously, the structure of TMV was solved at atomic detail by X-ray fiber diffraction but only for its dormant or high-calcium-concentration state, not its low-calcium-concentration state, which is relevant to viral assembly and disassembly inside host cells. Here we report a helical reconstruction of TMV in its calcium-free, metastable assembling state at 3.3 A resolution by cryo electron microscopy, revealing both protein side chains and RNA bases. An atomic model was built de novo showing marked differences from the high-calcium, dormant-state structure. Although it could be argued that there might be inaccuracies in the latter structure derived from X-ray fiber diffraction, these differences can be interpreted as conformational changes effected by calcium-driven switches, a common regulatory mechanism in plant viruses. Our comparisons of the structures of the low- and high-calcium states indicate that hydrogen bonds formed by Asp116 and Arg92 in the place of the calcium ion of the dormant (high-calcium) state might trigger allosteric changes in the RNA base-binding pockets of the coat protein. In turn, the coat protein-RNA interactions in our structure favor an adenine-X-guanine (A*G) motif over the G*A motif of the dormant state, thus offering an explanation underlying viral assembly initiation by an AAG motif.
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Hydrogen-bonding networks and RNA bases revealed by cryo electron microscopy suggest a triggering mechanism for calcium switches.,Ge P, Zhou ZH Proc Natl Acad Sci U S A. 2011 May 17. PMID:21586634<ref>PMID:21586634</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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==See Also==
==See Also==
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*[[Virus coat protein|Virus coat protein]]
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*[[Tobacco Mosaic Virus|Tobacco Mosaic Virus]]
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== References ==
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*[[Virus coat proteins 3D structures|Virus coat proteins 3D structures]]
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<references/>
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__TOC__
__TOC__
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</StructureSection>
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</SX>
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[[Category: Ge, P]]
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[[Category: Large Structures]]
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[[Category: Zhou, Z H]]
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[[Category: Ge P]]
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[[Category: Rna]]
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[[Category: Zhou ZH]]
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[[Category: Virus]]
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Current revision

CryoEM Helical Reconstruction of TMV

3j06, resolution 3.30Å

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