Part of a group II capsule biosynthesis locus. Part of a 3 gene operon, deletion of which prevents synthesis of the bacterial polysaccharide capsule. Capsule is important for the resistance of N.meningitidis serogroup X to killing by normal human serum. In Serogroup X the casule is a polymer of (alpha 1-->4)-linked N-acetylglucosamine 1-phosphate. This protein is probably the capsular polymerase. Stealth proteins are part of a protein family that is conserved from bacteria to higher eukaryotes. Family members were first identified in microbes as proteins that help pathogens to elude the host innate immune system. Microbial stealth proteins are involved in the biosynthesis of exopolysaccharides. Stealth proteins are predicted to function as hexose-1-phosphoryltransferases. Belongs to the stealth family.