This family consists of a group of proteins which are related to the Streptococcus rhamnose-glucose polysaccharide assembly protein (RgpF). Rhamnan backbones are found in several O polysaccharides of phytopathogenic bacteria and are regarded as pathogenic factors [1].

1: Expression and characterization of streptococcal rgp genes required for rhamnan synthesis in Escherichia coli. Shibata Y, Yamashita Y, Ozaki K, Nakano Y, Koga T; Infect Immun 2002;70:2891-2898. PMID:12010977