1sk3

<table><tr><td colspan='2'>[[1sk3]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SK3 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1SK3 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1oht|1oht]]</div></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">PGRPIA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1sk3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1sk3 OCA], [http://pdbe.org/1sk3 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1sk3 RCSB], [http://www.ebi.ac.uk/pdbsum/1sk3 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1sk3 ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/PGRP3_HUMAN PGRP3_HUMAN]] Pattern receptor that binds to murein peptidoglycans (PGN) of Gram-positive bacteria. Has bactericidal activity towards Gram-positive bacteria. May kill Gram-positive bacteria by interfering with peptidoglycan biosynthesis. Binds also to Gram-negative bacteria, and has bacteriostatic activity towards Gram-negative bacteria. Plays a role in innate immunity.<ref>PMID:16354652</ref>

<div style="background-color:#fffaf0;">

== Publication Abstract from PubMed ==

Peptidoglycan recognition proteins (PGRPs) are pattern recognition receptors of the innate immune system that bind, and in some cases hydrolyze, peptidoglycans (PGNs) on bacterial cell walls. These molecules, which are highly conserved from insects to mammals, participate in host defense against both Gram-positive and Gram-negative bacteria. We report the crystal structure of the C-terminal PGN-binding domain of human PGRP-Ialpha in two oligomeric states, monomer and dimer, to resolutions of 2.80 and 1.65 A, respectively. In contrast to PGRPs with PGN-lytic amidase activity, no zinc ion is present in the PGN-binding site of human PGRP-Ialpha. The structure reveals that PGRPs exhibit extensive topological variability in a large hydrophobic groove, located opposite the PGN-binding site, which may recognize host effector proteins or microbial ligands other than PGN. We also show that full-length PGRP-Ialpha comprises two tandem PGN-binding domains. These domains differ at most potential PGN-contacting positions, implying different fine specificities. Dimerization of PGRP-Ialpha, which occurs through three-dimensional domain swapping, is mediated by specific binding of sodium ions to a flexible hinge loop, stabilizing the conformation found in the dimer. We further demonstrate sodium-dependent dimerization of PGRP-Ialpha in solution, suggesting a possible mechanism for modulating PGRP activity through the formation of multivalent adducts.

Crystal structure of the C-terminal peptidoglycan-binding domain of human peptidoglycan recognition protein Ialpha.,Guan R, Malchiodi EL, Wang Q, Schuck P, Mariuzza RA J Biol Chem. 2004 Jul 23;279(30):31873-82. Epub 2004 May 12. PMID:15140887<ref>PMID:15140887</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

</div>

<div class="pdbe-citations 1sk3" style="background-color:#fffaf0;"></div>

[[Category: Human]]

[[Category: Guan, R]]

[[Category: Malchiodi, E L]]

[[Category: Mariuzza, R A]]

[[Category: Qian, W]]

[[Category: Schuck, P]]

[[Category: Immune system]]