In molecular biology, the protein domainb1 refers to the domainb1 of Protein L. L is a bacterialprotein with immunoglobulin (Ig) light chain-binding properties. It contains a number of homologous b1 repeats towards the N terminus. These repeats have been found to be responsible for the interaction of protein L with Ig light chains.[1]N-terminus domain contains five homologous B1 repeats of 72-76 amino acids each.[1]
^ abKastern W, Sjöbring U, Björck L (June 1992). "Structure of peptostreptococcal protein L and identification of a repeated immunoglobulin light chain-binding domain". J. Biol. Chem. 267 (18): 12820–5. PMID1618782.