Structure and Evolution of the Ivy Protein Family, Unexpected Lysozyme Inhibitors in Gram-Negative Bacteria.Abergel, C., Monchois, V., Byrne, D., Chenivesse, S., Lembo, F., Lazzaroni, J., Claverie, J.
(2007) Proc.Natl.Acad.Sci.USA 104: 6394
- PubMed: 17405861
- DOI: 10.1073/pnas.0611019104
- Primary Citation of Related Structures:
- PubMed Abstract:
- Crystallization and Preliminary Crystallographic Study of B0220, an "Orfan" Protein of Unknown Function from Escherichia Coli
Abergel, C.,Monchois, V.,Chenivesse, S.,Jeudy, S.,Claverie, J.-M.
(2000) Acta Crystallogr.,Sect.D 56: 1694
- Escherichia Coli Ykfe "Orfan" Gene Encodes a Potent Inhibitor of C-Type Lysozyme
Monchois, V.,Abergel, C.,Sturgis, J.,Jeudy, S.,Claverie, J.-M.
(2001) J.Biol.Chem. 276: 18437
Part of an ancestral bactericidal system, vertebrate C-type lysozyme targets the peptidoglycan moiety of bacterial cell walls. We report the crystal structure of a protein inhibitor of C-type lysozyme, the Escherichia coli Ivy protein, alone and in c ...
Part of an ancestral bactericidal system, vertebrate C-type lysozyme targets the peptidoglycan moiety of bacterial cell walls. We report the crystal structure of a protein inhibitor of C-type lysozyme, the Escherichia coli Ivy protein, alone and in complex with hen egg white lysozyme. Ivy exhibits a novel fold in which a protruding five-residue loop appears essential to its inhibitory effect. This feature guided the identification of Ivy orthologues in other Gram-negative bacteria. The structure of the evolutionary distant Pseudomonas aeruginosa Ivy orthologue was also determined in complex with hen egg white lysozyme, and its antilysozyme activity was confirmed. Ivy expression protects porous cell-wall E. coli mutants from the lytic effect of lysozyme, suggesting that it is a response against the permeabilizing effects of the innate vertebrate immune system. As such, Ivy acts as a virulence factor for a number of Gram-negative bacteria-infecting vertebrates.
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