has role protective antigen role KatG Hly Protegen ID: 842; NCBI Gene GI: 987033; NCBI Protein GI: 16802248; NCBI Protein Accession: NP_463733; NCBITaxon: 169963 Allen Xiang In an attempt to generate a subunit vaccine in this experimental disease model, eukaryotic plasmid DNA expression vectors containing genes encoding either the wild-type or modified forms of recombinant listeriolysin O (hly) were generated and used for genetic vaccination of naive mice. Results of these studies indicate that the intramuscular immunization of mice with specifically designed plasmid DNA constructs encoding recombinant forms of listeriolysin O (hly) stimulates peptide-specific CD8+ immune T cells that exhibit in vitro cytotoxic activity. More importantly, such immunization can provide protective immunity against a subsequent challenge with viable L. monocytogenes [PubMed: 10384131]. Oliver He protein