5tvo: Difference between revisions
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==Crystal structure of Trypanosoma brucei AdoMetDC-delta26 monomer== | |||
<StructureSection load='5tvo' size='340' side='right'caption='[[5tvo]], [[Resolution|resolution]] 1.48Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[5tvo]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Trypanosoma_brucei_brucei Trypanosoma brucei brucei]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5TVO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5TVO 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]] 1.481Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PYR:PYRUVIC+ACID'>PYR</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=5tvo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5tvo OCA], [https://pdbe.org/5tvo PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5tvo RCSB], [https://www.ebi.ac.uk/pdbsum/5tvo PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5tvo ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/Q587A7_TRYB2 Q587A7_TRYB2] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Catalytically inactive enzyme paralogs occur in many genomes. Some regulate their active counterparts but the structural principles of this regulation remain largely unknown. We report X-ray structures of Trypanosoma brucei S-adenosylmethionine decarboxylase alone and in functional complex with its catalytically dead paralogous partner, prozyme. We show monomeric TbAdoMetDC is inactive because of autoinhibition by its N-terminal sequence. Heterodimerization with prozyme displaces this sequence from the active site through a complex mechanism involving a cis-to-trans proline isomerization, reorganization of a beta-sheet, and insertion of the N-terminal alpha-helix into the heterodimer interface, leading to enzyme activation. We propose that the evolution of this intricate regulatory mechanism was facilitated by the acquisition of the dimerization domain, a single step that can in principle account for the divergence of regulatory schemes in the AdoMetDC enzyme family. These studies elucidate an allosteric mechanism in an enzyme and a plausible scheme by which such complex cooperativity evolved. | |||
Relief of autoinhibition by conformational switch explains enzyme activation by a catalytically dead paralog.,Volkov OA, Kinch L, Ariagno C, Deng X, Zhong S, Grishin N, Tomchick DR, Chen Z, Phillips MA Elife. 2016 Dec 15;5. pii: e20198. doi: 10.7554/eLife.20198. PMID:27977001<ref>PMID:27977001</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: | <div class="pdbe-citations 5tvo" style="background-color:#fffaf0;"></div> | ||
[[Category: Ariagno | |||
[[Category: | ==See Also== | ||
[[Category: | *[[SAM decarboxylase|SAM decarboxylase]] | ||
[[Category: Volkov | == References == | ||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Trypanosoma brucei brucei]] | |||
[[Category: Ariagno C]] | |||
[[Category: Chen Z]] | |||
[[Category: Phillips MA]] | |||
[[Category: Tomchick DR]] | |||
[[Category: Volkov OA]] | |||
