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[[Image:1nyi.gif|left|200px]]
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{{STRUCTURE_1nyi|  PDB=1nyi  |  SCENE=  }}
'''Crosslinked Hammerhead Ribozyme Initial State'''


==Crosslinked Hammerhead Ribozyme Initial State==
<StructureSection load='1nyi' size='340' side='right'caption='[[1nyi]], [[Resolution|resolution]] 2.85&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1nyi]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NYI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1NYI FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.85&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=5GP:GUANOSINE-5-MONOPHOSPHATE'>5GP</scene>, <scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene></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=1nyi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nyi OCA], [https://pdbe.org/1nyi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1nyi RCSB], [https://www.ebi.ac.uk/pdbsum/1nyi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1nyi ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
We have captured the structure of a pre-catalytic conformational intermediate of the hammerhead ribozyme using a phosphodiester tether formed between I and Stem II. This phosphodiester tether appears to mimic interactions in the wild-type hammerhead RNA that enable switching between nuclease and ligase activities, both of which are required in the replicative cycles of the satellite RNA viruses from which the hammerhead ribozyme is derived. The structure of this conformational intermediate reveals how the attacking nucleophile is positioned prior to cleavage, and demonstrates how restricting the ability of Stem I to rotate about its helical axis, via interactions with Stem II, can inhibit cleavage. Analogous covalent crosslinking experiments have demonstrated that imposing such restrictions on interhelical movement can change the hammerhead ribozyme from a nuclease to a ligase. Taken together, these results permit us to suggest that switching between ligase and nuclease activity is determined by the helical orientation of Stem I relative to Stem II.


==Overview==
A helical twist-induced conformational switch activates cleavage in the hammerhead ribozyme.,Dunham CM, Murray JB, Scott WG J Mol Biol. 2003 Sep 12;332(2):327-36. PMID:12948485<ref>PMID:12948485</ref>
We have captured the structure of a pre-catalytic conformational intermediate of the hammerhead ribozyme using a phosphodiester tether formed between I and Stem II. This phosphodiester tether appears to mimic interactions in the wild-type hammerhead RNA that enable switching between nuclease and ligase activities, both of which are required in the replicative cycles of the satellite RNA viruses from which the hammerhead ribozyme is derived. The structure of this conformational intermediate reveals how the attacking nucleophile is positioned prior to cleavage, and demonstrates how restricting the ability of Stem I to rotate about its helical axis, via interactions with Stem II, can inhibit cleavage. Analogous covalent crosslinking experiments have demonstrated that imposing such restrictions on interhelical movement can change the hammerhead ribozyme from a nuclease to a ligase. Taken together, these results permit us to suggest that switching between ligase and nuclease activity is determined by the helical orientation of Stem I relative to Stem II.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NYI OCA].
</div>
<div class="pdbe-citations 1nyi" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
A helical twist-induced conformational switch activates cleavage in the hammerhead ribozyme., Dunham CM, Murray JB, Scott WG, J Mol Biol. 2003 Sep 12;332(2):327-36. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12948485 12948485]
*[[Ribozyme 3D structures|Ribozyme 3D structures]]
[[Category: Dunham, C M.]]
== References ==
[[Category: Murray, J B.]]
<references/>
[[Category: Scott, W G.]]
__TOC__
[[Category: Hammerhead ribozyme crosslink conformational change]]
</StructureSection>
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 03:08:21 2008''
[[Category: Large Structures]]
[[Category: Synthetic construct]]
[[Category: Dunham CM]]
[[Category: Murray JB]]
[[Category: Scott WG]]
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