Structural highlights4ok7 is a 3 chain structure with sequence from Salmonella phage spn1s. Full crystallographic information is available from OCA. Publication Abstract from PubMedBacteriophage SPN1S infects the pathogenic Gram-negative bacterium Salmonella typhimurium and expresses endolysin for the release of phage progeny by degrading peptidoglycan of the host cell walls. Bacteriophage SPN1S endolysin exhibits high glycosidase activity against peptidoglycans, resulting in antimicrobial activity against a broad range of outer membrane-permeabilized Gram-negative bacteria. Here, we report a crystal structure of SPN1S endolysin, indicating that unlike most endolysins from Gram-negative bacteria background, the alpha-helical protein consists of two modular domains, a large and a small domain, with a concave groove between them. Comparison with other structurally homologous glycoside hydrolases indicated a possible peptidoglycan binding site in the groove, and the presence of a catalytic dyad in the vicinity of the groove, one residue in a large domain and the other in a junction between the two domains. The catalytic dyad was further validated by antimicrobial activity assay against outer membrane-permeabilized Escherichia coli. The three-helix bundle in the small domain containing a novel class of sequence motif exhibited binding affinity against outer membrane-permeabilized E. coli and was therefore proposed as the peptidoglycan-binding domain. These structural and functional features suggest that endolysin from a Gram-negative bacterial background has peptidoglycan-binding activity and performs glycoside hydrolase activity through the catalytic dyad. Structure of bacteriophage SPN1S endolysin reveals an unusual two-module fold for the peptidoglycan lytic and binding activity.,Park Y, Lim JA, Kong M, Ryu S, Rhee S Mol Microbiol. 2014 Apr;92(2):316-25. doi: 10.1111/mmi.12555. Epub 2014 Mar 12. PMID:24641441[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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