This family of proteins are likely to be lipoproteins. CNP1 (cryptic neisserial protein) has been expressed in E. coli and shown to be localised periplasmicly [1].

1: Characterization of a cryptic gene pair from Neisseria gonorrhoeae that is common to pathogenic Neisseria species. Seifert HS, Wilson D; Infect Immun. 1992;60:1232-1236. PMID:1541538