View source for 4mkm


==Repeat domains 1 & 2 of Clostridium perfringens Cpe0147==
<StructureSection load='4mkm' size='340' side='right'caption='[[4mkm]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4mkm]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Clostridium_perfringens_B_str._ATCC_3626 Clostridium perfringens B str. ATCC 3626]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4MKM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4MKM 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]] 1.75&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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=4mkm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4mkm OCA], [https://pdbe.org/4mkm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4mkm RCSB], [https://www.ebi.ac.uk/pdbsum/4mkm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4mkm ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Gram-positive bacteria are decorated by a variety of proteins that are anchored to the cell wall and project from it to mediate colonization, attachment to host cells, and pathogenesis. These proteins, and protein assemblies, such as pili, are typically long and thin yet must withstand high levels of mechanical stress and proteolytic attack. The recent discovery of intramolecular isopeptide bond cross-links, formed autocatalytically, in the pili from Streptococcus pyogenes has highlighted the role that such cross-links can play in stabilizing such structures. We have investigated a putative cell-surface adhesin from Clostridium perfringens comprising an N-terminal adhesin domain followed by 11 repeat domains. The crystal structure of a two-domain fragment shows that each domain has an IgG-like fold and contains an unprecedented ester bond joining Thr and Gln side chains. MS confirms the presence of these bonds. We show that the bonds form through an autocatalytic intramolecular reaction catalyzed by an adjacent His residue in a serine protease-like mechanism. Two buried acidic residues assist in the reaction. By mutagenesis, we show that loss of the ester bond reduces the thermal stability drastically and increases susceptibility to proteolysis. As in pilin domains, the bonds are placed at a strategic position joining the first and last strands, even though the Ig fold type differs. Bioinformatic analysis suggests that similar domains and ester bond cross-links are widespread in Gram-positive bacterial adhesins.

Autocatalytically generated Thr-Gln ester bond cross-links stabilize the repetitive Ig-domain shaft of a bacterial cell surface adhesin.,Kwon H, Squire CJ, Young PG, Baker EN Proc Natl Acad Sci U S A. 2013 Dec 16. PMID:24344302<ref>PMID:24344302</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4mkm" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Clostridium perfringens B str. ATCC 3626]]
[[Category: Large Structures]]
[[Category: Baker EN]]
[[Category: Kwon H]]
[[Category: Squire CJ]]
[[Category: Young PG]]