2aph
From Proteopedia
Crystal structure of human PGRP-IalphaC in complex with muramyl pentapeptide
Overview
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.
About this Structure
2APH is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
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 Page seeded by OCA on Sat May 3 19:19:03 2008
