View source for 1qjo


==INNERMOST LIPOYL DOMAIN OF THE PYRUVATE DEHYDROGENASE FROM ESCHERICHIA COLI==
<StructureSection load='1qjo' size='340' side='right'caption='[[1qjo]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1qjo]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_BL21(DE3) Escherichia coli BL21(DE3)]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QJO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QJO FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=1qjo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qjo OCA], [https://pdbe.org/1qjo PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qjo RCSB], [https://www.ebi.ac.uk/pdbsum/1qjo PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qjo ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ODP2_ECOLI ODP2_ECOLI] The pyruvate dehydrogenase complex catalyzes the overall conversion of pyruvate to acetyl-CoA and CO(2). It contains multiple copies of three enzymatic components: pyruvate dehydrogenase (E1), dihydrolipoamide acetyltransferase (E2) and lipoamide dehydrogenase (E3).
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/qj/1qjo_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1qjo ConSurf].
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== Publication Abstract from PubMed ==
The three lipoyl (E2plip) domains of the dihydrolipoyl acetyltransferase component of the pyruvate dehydrogenase (PDH) complex of Escherichia coli house the lipoyl-lysine side chain essential for active-site coupling and substrate channelling within the complex. The structure of the unlipoylated form of the innermost domain (E2plip(apo)) was determined by multidimensional NMR spectroscopy and found to resemble closely that of a nonfunctional hybrid domain determined previously [Green et al. (1995) J. Mol. Biol. 248, 328-343]. The domain comprises two four-stranded beta-sheets, with the target lysine residue residing at the tip of a type-I beta-turn in one of the sheets; the N- and C-termini lie close together at the opposite end of the molecule in the other beta-sheet. Measurement of (15)N NMR relaxation parameters and backbone hydrogen/deuterium (H/D) exchange rates reveals that the residues in and surrounding the lipoyl-lysine beta-turn in the E2plip(apo) form of the domain become less flexible after lipoylation of the lysine residue. This implies that the lipoyl-lysine side chain may not sample the full range of conformational space once thought. Moreover, reductive acetylation of the lipoylated domain (E2plip(holo) --&gt; E2plip(redac)) was accompanied by large changes in chemical shift between the two forms, and multiple resonances were observed for several residues. This implies a change in conformation and the existence of multiple conformations of the domain on reductive acetylation, which may be important in stabilizing this catalytic intermediate.

Restricted motion of the lipoyl-lysine swinging arm in the pyruvate dehydrogenase complex of Escherichia coli.,Jones DD, Stott KM, Howard MJ, Perham RN Biochemistry. 2000 Jul 25;39(29):8448-59. PMID:10913250<ref>PMID:10913250</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Dihydrolipoamide acetyltransferase 3D structures|Dihydrolipoamide acetyltransferase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Howard MJ]]
[[Category: Jones DD]]
[[Category: Perham RN]]