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| | ==Crystal Structure of E coli pepQ== | | ==Crystal Structure of E coli pepQ== |
| - | <StructureSection load='4qr8' size='340' side='right' caption='[[4qr8]], [[Resolution|resolution]] 2.00Å' scene=''> | + | <StructureSection load='4qr8' size='340' side='right'caption='[[4qr8]], [[Resolution|resolution]] 2.00Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4qr8]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4QR8 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4QR8 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4qr8]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4QR8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4QR8 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">pepQ, b3847, JW3823 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</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=4qr8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qr8 OCA], [https://pdbe.org/4qr8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4qr8 RCSB], [https://www.ebi.ac.uk/pdbsum/4qr8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4qr8 ProSAT]</span></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Xaa-Pro_dipeptidase Xaa-Pro dipeptidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.13.9 3.4.13.9] </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=4qr8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qr8 OCA], [http://pdbe.org/4qr8 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4qr8 RCSB], [http://www.ebi.ac.uk/pdbsum/4qr8 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4qr8 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/PEPQ_ECOLI PEPQ_ECOLI]] Splits dipeptides with a prolyl residue in the C-terminal position and a polar or nonpolar amino acid at the N-terminal position. With much lower efficiency, also catalyzes the stereoselective hydrolysis of a wide variety of organophosphate triesters and organophosphonate diesters. Is able to hydrolyze the organophosphorus insecticide paraoxon and the p-nitrophenyl analogs of the nerve agents GB (sarin), GD (soman), GF, Vx and rVX.<ref>PMID:15313226</ref> | + | [https://www.uniprot.org/uniprot/PEPQ_ECOLI PEPQ_ECOLI] Splits dipeptides with a prolyl residue in the C-terminal position and a polar or nonpolar amino acid at the N-terminal position. With much lower efficiency, also catalyzes the stereoselective hydrolysis of a wide variety of organophosphate triesters and organophosphonate diesters. Is able to hydrolyze the organophosphorus insecticide paraoxon and the p-nitrophenyl analogs of the nerve agents GB (sarin), GD (soman), GF, Vx and rVX.<ref>PMID:15313226</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Ecoli]] | + | [[Category: Escherichia coli K-12]] |
| - | [[Category: Xaa-Pro dipeptidase]] | + | [[Category: Large Structures]] |
| - | [[Category: Pingwei, L]] | + | [[Category: Pingwei L]] |
| - | [[Category: Hydrolase]]
| + | |
| - | [[Category: Pepq]]
| + | |
| - | [[Category: Protease]]
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| Structural highlights
Function
PEPQ_ECOLI Splits dipeptides with a prolyl residue in the C-terminal position and a polar or nonpolar amino acid at the N-terminal position. With much lower efficiency, also catalyzes the stereoselective hydrolysis of a wide variety of organophosphate triesters and organophosphonate diesters. Is able to hydrolyze the organophosphorus insecticide paraoxon and the p-nitrophenyl analogs of the nerve agents GB (sarin), GD (soman), GF, Vx and rVX.[1]
Publication Abstract from PubMed
Prolidases, metalloproteases that catalyze the cleavage of Xaa-Pro dipeptides, are conserved enzymes found in prokaryotes and eukaryotes. In humans, prolidase is crucial for the recycling of collagen. To further characterize the essential elements of this enzyme, we utilized the Escherichia coli prolidase, PepQ, which shares striking similarity with eukaryotic prolidases. Through structural and bioinformatic insights, we have extended previous characterizations of the prolidase active site, uncovering a key component for substrate specificity. Here we report the structure of E. coli PepQ, solved at 2.0 A resolution. The structure shows an antiparallel, dimeric protein, with each subunit containing N-terminal and C-terminal domains. The C-terminal domain is formed by the pita-bread fold typical for this family of metalloproteases, with two Mg(II) ions coordinated by five amino-acid ligands. Comparison of the E. coli PepQ structure and sequence with homologous structures and sequences from a diversity of organisms reveals distinctions between prolidases from Gram-positive eubacteria and archaea, and those from Gram-negative eubacteria, including the presence of loop regions in the E. coli protein that are conserved in eukaryotes. One such loop contains a completely conserved arginine near the catalytic site. This conserved arginine is predicted by docking simulations to interact with the C-terminus of the substrate dipeptide. Kinetic analysis using both a charge-neutralized substrate and a charge-reversed variant of PepQ support this conclusion, and allow for the designation of a new role for this key region of the enzyme active site.
Structural basis of substrate selectivity of E. coli prolidase.,Weaver J, Watts T, Li P, Rye HS PLoS One. 2014 Oct 29;9(10):e111531. doi: 10.1371/journal.pone.0111531., eCollection 2014. PMID:25354344[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Park MS, Hill CM, Li Y, Hardy RK, Khanna H, Khang YH, Raushel FM. Catalytic properties of the PepQ prolidase from Escherichia coli. Arch Biochem Biophys. 2004 Sep 15;429(2):224-30. PMID:15313226 doi:http://dx.doi.org/10.1016/j.abb.2004.06.022
- ↑ Weaver J, Watts T, Li P, Rye HS. Structural basis of substrate selectivity of E. coli prolidase. PLoS One. 2014 Oct 29;9(10):e111531. doi: 10.1371/journal.pone.0111531., eCollection 2014. PMID:25354344 doi:http://dx.doi.org/10.1371/journal.pone.0111531
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