3hml

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{{Seed}}
 
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[[Image:3hml.png|left|200px]]
 
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==Crystal Structure of PqqC Active Site Mutant H154S in Complex with PQQ==
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The line below this paragraph, containing "STRUCTURE_3hml", creates the "Structure Box" on the page.
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<StructureSection load='3hml' size='340' side='right'caption='[[3hml]], [[Resolution|resolution]] 2.35&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[3hml]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Klebsiella_pneumoniae_subsp._pneumoniae_MGH_78578 Klebsiella pneumoniae subsp. pneumoniae MGH 78578]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3HML OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3HML FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.35&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PQQ:PYRROLOQUINOLINE+QUINONE'>PQQ</scene></td></tr>
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{{STRUCTURE_3hml| PDB=3hml | SCENE= }}
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3hml FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3hml OCA], [https://pdbe.org/3hml PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3hml RCSB], [https://www.ebi.ac.uk/pdbsum/3hml PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3hml ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/PQQC_KLEP7 PQQC_KLEP7] Ring cyclization and eight-electron oxidation of 3a-(2-amino-2-carboxyethyl)-4,5-dioxo-4,5,6,7,8,9-hexahydroquinoline-7,9-dicarboxylic-acid to PQQ.[HAMAP-Rule:MF_00654]
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/hm/3hml_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=3hml ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Pyrroloquinoline quinone [4,5-dihydro-4,5-dioxo-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylic acid (PQQ)] is a bacterial cofactor in numerous alcohol dehydrogenases including methanol dehydrogenase and glucose dehydrogenase. Its biosynthesis in Klebsiella pneumoniae is facilitated by six genes, pqqABCDEF and proceeds by an unknown pathway. PqqC is one of two metal free oxidases of known structure and catalyzes the last step of PQQ biogenesis which involves a ring closure and an eight-electron oxidation of the substrate [3a-(2-amino-2-carboxyethyl)-4,5-dioxo-4,5,6,7,8,9-hexahydroquinoline-7,9- dicarboxylic acid (AHQQ)]. PqqC has 14 conserved active site residues, which have previously been shown to be in close contact with bound PQQ. Herein, we describe the structures of three PqqC active site variants, H154S, Y175F, and the double mutant R179S/Y175S. The H154S crystal structure shows that, even with PQQ bound, the enzyme is still in the "open" conformation with helices alpha5b and alpha6 unfolded and the active site solvent accessible. The Y175F PQQ complex crystal structure reveals the closed conformation indicating that Y175 is not required for the conformational change. The R179S/Y175S AHQQ complex crystal structure is the most mechanistically informative, indicating an open conformation with a reaction intermediate trapped in the active site. The intermediate seen in R179S/Y175S is tricyclic but nonplanar, implying that it has not undergone oxidation. These studies implicate a stepwise process in which substrate binding leads to the generation of the closed protein conformation, with the latter playing a critical role in O(2) binding and catalysis. Proteins 2010. (c) 2010 Wiley-Liss, Inc.
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===Crystal Structure of PqqC Active Site Mutant H154S in Complex with PQQ===
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Structural studies of mutant forms of the PQQ-forming enzyme PqqC in the presence of product and substrate.,Puehringer S, Rosefigura J, Metlitzky M, Toyama H, Klinman JP, Schwarzenbacher R Proteins. 2010 Aug 15;78(11):2554-62. PMID:20602352<ref>PMID:20602352</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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The line below this paragraph, {{ABSTRACT_PUBMED_20602352}}, adds the Publication Abstract to the page
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<div class="pdbe-citations 3hml" style="background-color:#fffaf0;"></div>
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(as it appears on PubMed at http://www.pubmed.gov), where 20602352 is the PubMed ID number.
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== References ==
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<references/>
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{{ABSTRACT_PUBMED_20602352}}
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__TOC__
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</StructureSection>
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==About this Structure==
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[[Category: Klebsiella pneumoniae subsp. pneumoniae MGH 78578]]
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3HML is a 2 chains structure with sequences from [http://en.wikipedia.org/wiki/Klebsiella_pneumoniae_subsp._pneumoniae Klebsiella pneumoniae subsp. pneumoniae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3HML OCA].
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[[Category: Large Structures]]
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[[Category: Puehringer S]]
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==Reference==
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[[Category: Schwarzenbacher R]]
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<ref group="xtra">PMID:20602352</ref><references group="xtra"/>
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[[Category: Klebsiella pneumoniae subsp. pneumoniae]]
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[[Category: Pyrroloquinoline-quinone synthase]]
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[[Category: Puehringer, S.]]
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[[Category: Schwarzenbacher, R.]]
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[[Category: All helical]]
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[[Category: Complex]]
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[[Category: Oxidase]]
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[[Category: Oxidoreductase]]
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[[Category: Pqq biosynthesis]]
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[[Category: Pqqc]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 14 15:54:51 2010''
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Current revision

Crystal Structure of PqqC Active Site Mutant H154S in Complex with PQQ

PDB ID 3hml

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