This putative domain is found at the N-terminus of a large number of bacterial proteins. Its adhesive function was described in Lactobacillus reuteri serine-rich repeat proteins [1]. Structure predictions show it is composed of a beta solenoid repeat related to Pectate lyase.

1: Structural basis for the role of serine-rich repeat proteins from Lactobacillus reuteri in gut microbe-host interactions. Sequeira S, Kavanaugh D, MacKenzie DA, Suligoj T, Walpole S, Leclaire C, Gunning AP, Latousakis D, Willats WGT, Angulo J, Dong C, Juge N; Proc Natl Acad Sci U S A. 2018;115:E2706. PMID:29507249