BNR/Asp-box repeat

BNR/Asp-box repeat is a repetitive sequence of amino acids contained in some proteins. Many of these proteins contain multiple BNR (bacterial neuraminidase repeat) repeats or Asp-boxes.

The repeats are short, however the repeats are never found closer than 40 residues together suggesting that the repeat is structurally longer. The Asp-box itself adopts a well-defined beta-hairpin fold. These repeats are found in a variety of non-homologous proteins, including bacterial ribonucleases, sulphite oxidases, reelin, netrins, sialidases, neuraminidases, some lipoprotein receptors, and a variety of glycosyl hydrolases.

Examples
Human genes encoding proteins containing this domain include:
 * NEU1
 * NEU2
 * NEU3
 * RELN
 * SORCS1
 * SORCS2
 * SORCS3
 * SORL1
 * SORT1