==Crystal structure of human PGRP-IalphaC in complex with muramyl pentapeptide==

<StructureSection load='2aph' size='340' side='right' caption='[[2aph]], [[Resolution|resolution]] 2.10&Aring;' scene=''>

<table><tr><td colspan='2'>[[2aph]] is a 4 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=2APH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2APH FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=AMU:BETA-N-ACETYLMURAMIC+ACID'>AMU</scene></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=2aph FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2aph OCA], [http://pdbe.org/2aph PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2aph RCSB], [http://www.ebi.ac.uk/pdbsum/2aph PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2aph ProSAT]</span></td></tr>

== Function ==

[[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 bacterial peptidoglycans (PGNs). We determined the crystal structure, to 2.1 A resolution, of the C-terminal PGN-binding domain of human PGRP-I alpha in complex with a muramyl pentapeptide (MPP) from Gram-positive bacteria containing a complete peptide stem (L-Ala-D-isoGln-L-Lys-D-Ala-D-Ala). The structure reveals important features not observed previously in the complex between PGRP-I alpha and a muramyl tripeptide lacking D-Ala at stem positions 4 and 5. Most notable are ligand-induced structural rearrangements in the PGN-binding site that are essential for entry of the C-terminal portion of the peptide stem and for locking MPP in the binding groove. We propose that similar structural rearrangements to accommodate the PGN stem likely characterize many PGRPs, both mammalian and insect.

Crystal structure of human peptidoglycan recognition protein I alpha bound to a muramyl pentapeptide from Gram-positive bacteria.,Guan R, Brown PH, Swaminathan CP, Roychowdhury A, Boons GJ, Mariuzza RA Protein Sci. 2006 May;15(5):1199-206. PMID:16641493<ref>PMID:16641493</ref>

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

</div>

<div class="pdbe-citations 2aph" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Human]]

[[Category: Boons, G]]

[[Category: Lys-type]]

[[Category: Pgrp]]