May be involved in the polymorphic O-glycosylation of the serine-rich repeat protein PsrP. Has hydrolytic activity against UDP-galactose and to a lesser extent against UDP-glucose; no glycosyltransferase activity has been seen with tested substrates. Encoded in RD10, a pathogenicity island with an atypical GC content that is associated with invasive pneumococcal disease. Pathogenicity islands account for greater than half the genomic diversity observed between isolates (PubMed:11463916, PubMed:16861665). The main function of this island seems to be correct synthesis and export of pneumococcal serine-rich repeat protein PsrP (Probable). In the N-terminal section; belongs to the glycosyltransferase 8 family.