2WMG HYDROLASE, GLYCOSIDE HYDROLASE, STREPTOCOCCUS PNEUMONIAE, LEWISY BLOOD GROUP ANTIGEN, FUCOSE UTILIZATION CRYSTAL STRUCTURE OF THE CATALYTIC MODULE OF A FAMILY 98 GLYCOSIDE HYDROLASE FROM STREPTOCOCCUS PNEUMONIAE TIGR4 ( SP4GH98) IN COMPLEX WITH THE LEWISY PENTASACCHARIDE BLOOD GROUP ANTIGEN.