3ax2

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{{STRUCTURE_3ax2| PDB=3ax2 | SCENE= }}
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==Crystal structure of rat TOM20-ALDH presequence complex: a disulfide-tethered complex with a non-optimized, long linker==
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===Crystal structure of rat TOM20-ALDH presequence complex: a disulfide-tethered complex with a non-optimized, long linker===
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<StructureSection load='3ax2' size='340' side='right' caption='[[3ax2]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
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{{ABSTRACT_PUBMED_21591667}}
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== Structural highlights ==
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<table><tr><td colspan='2'>[[3ax2]] is a 8 chain structure with sequence from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AX2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3AX2 FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>
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<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene></td></tr>
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3awr|3awr]], [[3ax3|3ax3]], [[3ax5|3ax5]]</td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Tomm20 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10116 Rattus norvegicus])</td></tr>
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<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=3ax2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ax2 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3ax2 RCSB], [http://www.ebi.ac.uk/pdbsum/3ax2 PDBsum]</span></td></tr>
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</table>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Most mitochondrial proteins are synthesized in the cytosol and imported into mitochondria. The Tom20 protein, residing on the mitochondrial surface, recognizes the N-terminal presequences of precursor proteins. We previously determined the crystal structures of the Tom20-presequence complex. The successful crystallization involved tethering the presequence to Tom20 through an intermolecular disulfide bond with an optimized linker. In this work, we assessed the tethering method. The intermolecular disulfide bond was cleaved in crystal with a reducing agent. The pose (i.e., conformation and position) of the presequence was identical to the previously determined pose. In another experiment, a longer linker than the optimized length was used for the tethering. The perturbation of the tether changed the pose slightly, but the interaction mode was preserved. These results argue against the forced interaction of the presequence by its covalent attachment to Tom20. Second, as an alternative method referred to as "molecular stiffening", we introduced a disulfide bond within the presequence peptide to restrict the freedom of the peptide in the unbound states. One presequence analogue exhibited over 100-fold higher affinity than its linear counterpart and generated cocrystals with Tom20. One of the two crystallographic snapshots revealed a known pose previously determined by the tethering method, and the other snapshot depicted a new pose. These results confirmed and extended the dynamic, multiple bound state model of the Tom20-presequence interactions and also demonstrated the validity of the molecular tethering and stiffening techniques in studies of transient protein-peptide interactions.
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==Function==
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Crystallographic snapshots of tom20-mitochondrial presequence interactions with disulfide-stabilized peptides.,Saitoh T, Igura M, Miyazaki Y, Ose T, Maita N, Kohda D Biochemistry. 2011 Jun 21;50(24):5487-96. Epub 2011 May 26. PMID:21591667<ref>PMID:21591667</ref>
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[[http://www.uniprot.org/uniprot/TOM20_RAT TOM20_RAT]] Central component of the receptor complex responsible for the recognition and translocation of cytosolically synthesized mitochondrial preproteins. Together with TOM22 functions as the transit peptide receptor at the surface of the mitochondrion outer membrane and facilitates the movement of preproteins into the TOM40 translocation pore (By similarity).
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==About this Structure==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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[[3ax2]] is a 8 chain structure with sequence from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AX2 OCA].
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</div>
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== References ==
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==Reference==
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<references/>
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<ref group="xtra">PMID:021591667</ref><references group="xtra"/><references/>
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__TOC__
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</StructureSection>
[[Category: Rattus norvegicus]]
[[Category: Rattus norvegicus]]
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[[Category: Kohda, D.]]
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[[Category: Kohda, D]]
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[[Category: Maita, Y.]]
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[[Category: Maita, Y]]
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[[Category: Saitoh, T.]]
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[[Category: Saitoh, T]]
[[Category: Membrane protein-transport protein complex]]
[[Category: Membrane protein-transport protein complex]]
[[Category: Protein-protein complex]]
[[Category: Protein-protein complex]]

Revision as of 13:33, 18 December 2014

Crystal structure of rat TOM20-ALDH presequence complex: a disulfide-tethered complex with a non-optimized, long linker

3ax2, resolution 1.90Å

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