View source for 5ag8


==CRYSTAL STRUCTURE OF A MUTANT (665I6H) OF THE C-TERMINAL DOMAIN OF RGPB==
<StructureSection load='5ag8' size='340' side='right'caption='[[5ag8]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5ag8]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Porphyromonas_gingivalis_W83 Porphyromonas gingivalis W83]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5AG8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5AG8 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]] 1.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=5ag8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5ag8 OCA], [https://pdbe.org/5ag8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5ag8 RCSB], [https://www.ebi.ac.uk/pdbsum/5ag8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5ag8 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CPG2_PORGI CPG2_PORGI] Thiol protease which is believed to participate in intracellular degradation and turnover of proteins. Its proteolytic activity is a major factor in both periodontal tissue destruction and in bacterial host defense mechanisms. Activates complement C3 and C5 (By similarity).
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== Publication Abstract from PubMed ==
In the recently characterized Type IX Secretion System (T9SS), the conserved C-terminal domain (CTD) in secreted proteins functions as an outer membrane translocation signal for export of virulence factors to the cell surface in the Gram-negative Bacteroidetes phylum. In the periodontal pathogen Porphyromonas gingivalis, the CTD is cleaved off by PorU sortase in a sequence-independent manner, and anionic lipopolysaccharide (A-LPS) is attached to many translocated proteins, thus anchoring them to the bacterial surface. Here, we solved the atomic structure of the CTD of gingipain B (RgpB) from P. gingivalis, alone and together with a preceding immunoglobulin-superfamily domain (IgSF). The CTD was found to possess a typical Ig-like fold encompassing seven antiparallel beta-strands organized in two beta-sheets, packed into a beta-sandwich structure that can spontaneously dimerise through C-terminal strand swapping. Small angle X-ray scattering (SAXS) revealed no fixed orientation of the CTD with respect to the IgSF. By introducing insertion or substitution of residues within the inter-domain linker in the native protein, we were able to show that despite the region being unstructured, it nevertheless is resistant to general proteolysis. These data suggest structural motifs located in the two adjacent Ig-like domains dictate the processing of CTDs by the T9SS secretion pathway.

The outer-membrane export signal of Porphyromonas gingivalis type IX secretion system (T9SS) is a conserved C-terminal beta-sandwich domain.,de Diego I, Ksiazek M, Mizgalska D, Koneru L, Golik P, Szmigielski B, Nowak M, Nowakowska Z, Potempa B, Houston JA, Enghild JJ, Thogersen IB, Gao J, Kwan AH, Trewhella J, Dubin G, Gomis-Ruth FX, Nguyen KA, Potempa J Sci Rep. 2016 Mar 23;6:23123. doi: 10.1038/srep23123. PMID:27005013<ref>PMID:27005013</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 5ag8" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Porphyromonas gingivalis W83]]
[[Category: Dubin G]]
[[Category: Enghild J]]
[[Category: Golik P]]
[[Category: Gomis-Ruth FX]]
[[Category: Koneru L]]
[[Category: Ksiazek M]]
[[Category: Mizgalska D]]
[[Category: Nguyen KA]]
[[Category: Nowak M]]
[[Category: Nowakowska Z]]
[[Category: Potempa B]]
[[Category: Potempa J]]
[[Category: Szmigielski B]]
[[Category: Thogersen IB]]
[[Category: De Diego I]]