Based on Bacteroides thetaiotaomicron gene BT_2585, a putative uncharacterized protein. As seen in gene expression experiments (http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE2231), it appears to be upregulated in the presence of host or vs when in culture.
Jiyao W et al.(2023). "The conserved domain database in 2023.",