Members of this family are restricted to the genus Leptospira. They are putative lipoproteins with only a single Cys residue, invariant at the proposed lipoprotein signal cleavage site. Residues in the -1 position are unusual for lipoproteins in general, but consistent with observations in Leptospira, as described in PMID:26890609.
Jiyao W et al.(2023). "The conserved domain database in 2023.",