3hml

From Proteopedia

(Difference between revisions)

Revision as of 02:24, 5 August 2016

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

Structural highlights

3hml is a 2 chain structure with sequence from Klep7. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	1otw, 1otv, 3hlx, 3hnh
Gene:	pqqC (KLEP7)
Activity:	Pyrroloquinoline-quinone synthase, with EC number 1.3.3.11
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[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]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

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.

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^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Puehringer S, Rosefigura J, Metlitzky M, Toyama H, Klinman JP, Schwarzenbacher R. Structural studies of mutant forms of the PQQ-forming enzyme PqqC in the presence of product and substrate. Proteins. 2010 Aug 15;78(11):2554-62. PMID:20602352 doi:10.1002/prot.22769

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/3hml"

@@ Line 1: / Line 1: @@
 ==Crystal Structure of PqqC Active Site Mutant H154S in Complex with PQQ==
 <StructureSection load='3hml' size='340' side='right' caption='[[3hml]], [[Resolution|resolution]] 2.35&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[3hml]] is a 2 chain structure with sequence 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]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3HML FirstGlance]. <br>
+<table><tr><td colspan='2'>[[3hml]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Klep7 Klep7]. 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 [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3HML FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PQQ:PYRROLOQUINOLINE+QUINONE'>PQQ</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1otw|1otw]], [[1otv|1otv]], [[3hlx|3hlx]], [[3hnh|3hnh]]</td></tr>
-<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">pqqC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=72407 Klebsiella pneumoniae subsp. pneumoniae])</td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">pqqC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=272620 KLEP7])</td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Pyrroloquinoline-quinone_synthase Pyrroloquinoline-quinone synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.3.3.11 1.3.3.11] </span></td></tr>
-<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=3hml FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3hml OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3hml RCSB], [http://www.ebi.ac.uk/pdbsum/3hml PDBsum]</span></td></tr>
+<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=3hml FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3hml OCA], [http://pdbe.org/3hml PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3hml RCSB], [http://www.ebi.ac.uk/pdbsum/3hml PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3hml ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 19: / Line 20: @@
     <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/chain_selection.php?pdb_ID=2ata ConSurf].
+</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].
 <div style="clear:both"></div>
 <div style="background-color:#fffaf0;">
@@ Line 29: / Line 30: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 3hml" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Klebsiella pneumoniae subsp. pneumoniae]]
+[[Category: Klep7]]
 [[Category: Pyrroloquinoline-quinone synthase]]
 [[Category: Puehringer, S]]

3hml

From Proteopedia

Revision as of 02:24, 5 August 2016

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

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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