Stimulates the host (mouse) immune response; lipidated protein produced in E.coli stimulates T-cell proliferation in mice previously sensitized with LprN. Spleenocytes from these mice produce increased amounts of TNF-alpha and IFN-gamma, as well as somewhat increased nitric oxide levels, upon subsequent challenge with LprN. Previously sensitized mice infected with M.tuberculosis have an exacerbated disease response, suggesting this lipoprotein may down-regulate the host's immune response. Lipidated upon expression in E.coli.