Non-viral sialidases. Sialidases or neuraminidases function to bind and hydrolyze terminal sialic acid residues from various glycoconjugates, they play vital roles in pathogenesis, bacterial nutrition and cellular interactions. They have a six-bladed, beta-propeller fold with the non-viral sialidases containing 2-5 Asp-box motifs (most commonly Ser/Thr-X-Asp-[X]-Gly-X-Thr- Trp/Phe). This CD includes eubacterial and eukaryotic sialidases.
BNR repeat-containing family member. BNR_4 is a family which carries the unique sequence motif SxDxGxTW which is so characteristic of the repeats of the BNR family, pfam02012. It is unclear whether or not this unit is repeated throughout the sequences of this family, but if it is then the family is likely to be bacterial neuraminidase.