This family of adhesins bind to the Dr blood group antigen component of decay-accelerating factor. This mediates adherence of uropathogenic Escherichia coli to the urinary tract. This family contains both fimbriated and afimbriated adherence structures [1]. This protein also confers the phenotype of mannose-resistant hemagglutination, which can be inhibited by chloramphenicol. The N terminal portion of the protein is though to be responsible for chloramphenicol sensitivity [2].

1: Distribution of drb genes coding for Dr binding adhesins among uropathogenic and fecal Escherichia coli isolates and identification of new subtypes. Zhang L, Foxman B, Tallman P, Cladera E, Le Bouguenec C, Marrs CF; Infect Immun 1997;65:2011-2018. PMID:9169726

2: Molecular structure of the Dr adhesin: nucleotide sequence and mapping of receptor-binding domain by use of fusion constructs. Swanson TN, Bilge SS, Nowicki B, Moseley SL; Infect Immun 1991;59:261-268. PMID:1670929