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New page: left|200px<br /><applet load="429d" size="350" color="white" frame="true" align="right" spinBox="true" caption="429d, resolution 2.70Å" /> '''CRYSTAL STRUCTURE OF...
 
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[[Image:429d.gif|left|200px]]<br /><applet load="429d" size="350" color="white" frame="true" align="right" spinBox="true"
caption="429d, resolution 2.70&Aring;" />
'''CRYSTAL STRUCTURE OF A LEADZYME; METAL BINDING AND IMPLICATIONS FOR CATALYSIS'''<br />


==Overview==
==CRYSTAL STRUCTURE OF A LEADZYME; METAL BINDING AND IMPLICATIONS FOR CATALYSIS==
The leadzyme is a small RNA motif that catalyzes a site-specific, Pb2+-dependent cleavage reaction. As such, it is an example of a, metal-dependent RNA enzyme. Here we describe the X-ray crystallographic, structure of the leadzyme, which reveals two independent molecules per, asymmetric unit. Both molecules feature an internal loop in which a bulged, purine base stack twists away from the helical stem. This kinks the, backbone, rendering the phosphodiester bond susceptible to cleavage. The, independent molecules have different conformations: one leadzyme copy, coordinates Mg2+, whereas the other binds only Ba2+ or Pb2+. In the active, site of the latter molecule, a single Ba2+ ion coordinates the 2'-OH, nucleophile, and appears to mimic the binding of catalytic lead. These, observations allow a bond cleavage reaction to be modeled, which reveals, the minimal structural features necessary for catalysis by this small, ribozyme.
<StructureSection load='429d' size='340' side='right'caption='[[429d]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[429d]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=429D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=429D 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]] 2.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=429d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=429d OCA], [https://pdbe.org/429d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=429d RCSB], [https://www.ebi.ac.uk/pdbsum/429d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=429d ProSAT]</span></td></tr>
</table>


==About this Structure==
==See Also==
429D is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/ ] with <scene name='pdbligand=MG:'>MG</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=429D OCA].
*[[Ribozyme 3D structures|Ribozyme 3D structures]]
 
__TOC__
==Reference==
</StructureSection>
Crystal structure of a lead-dependent ribozyme revealing metal binding sites relevant to catalysis., Wedekind JE, McKay DB, Nat Struct Biol. 1999 Mar;6(3):261-8. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10074945 10074945]
[[Category: Large Structures]]
[[Category: Protein complex]]
[[Category: McKay DB]]
[[Category: McKay, D. B.]]
[[Category: Wedekind JE]]
[[Category: Wedekind, J. E.]]
[[Category: MG]]
[[Category: bulged nucleotides]]
[[Category: lead-dependent cleavage]]
[[Category: leadzyme]]
[[Category: rna]]
[[Category: trna internal loop]]
 
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Latest revision as of 10:38, 1 March 2024

CRYSTAL STRUCTURE OF A LEADZYME; METAL BINDING AND IMPLICATIONS FOR CATALYSIS

429d, resolution 2.70Å

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