5ctv

Catalytic domain of LytA, the major autolysin of Streptococcus pneumoniae, (C60A, H133A, C136A mutant) complexed with peptidoglycan fragment

spinqualitylabelsall models 5ctv, resolution 1.05Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5ctv is a 3 chain structure with sequence from Strpn. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AMV, NAG NonStd Res: DAL, DGL Related: 4ivv Gene: lytA, SP_1937 (STRPN) Activity: N-acetylmuramoyl-L-alanine amidase, with EC number 3.5.1.28 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [ALYS_STRPN] Autolysins are involved in some important biological processes such as cell separation, cell-wall turnover, competence for genetic transformation, formation of the flagella and sporulation. Autolysin strictly depends on the presence of choline-containing cell walls for activity. Publication Abstract from PubMed The pneumococcal autolysin LytA is a key virulence factor involved in several important functions including DNA competence, immune evasion and biofilm formation. Here, we present the 1.05 A crystal structure of the catalytic domain of LytA in complex with a synthetic cell-wall-based peptidoglycan (PG) ligand that occupies the entire Y-shaped substrate-binding crevice. As many as twenty-one amino-acid residues are engaged in ligand interactions with a majority of these interactions directed towards the glycan strand. All saccharides are intimately bound through hydrogen bond, van der Waals and CH-pi interactions. Importantly, the structure of LytA is not altered upon ligand binding, whereas the bound ligand assumes a different conformation compared to the unbound NMR-based solution structure of the same PG-fragment. Mutational study reveals that several non-catalytic glycan-interacting residues, structurally conserved in other amidases from Gram-positive Firmicutes, are pivotal for enzymatic activity. The three-dimensional structure of the LytA/PG complex provides a novel structural basis for ligand restriction by the pneumococcal autolysin, revealing for the first time an importance of the multivalent binding to PG saccharides. This article is protected by copyright. All rights reserved. The crystal structure of the major pneumococcal autolysin LytA in complex with a large peptidoglycan fragment reveals the pivotal role of glycans for lytic activity.,Sandalova T, Lee M, Henriques-Normark B, Hesek D, Mobashery S, Mellroth P, Achour A Mol Microbiol. 2016 Jun 7. doi: 10.1111/mmi.13435. PMID:27273793 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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