Members of this family are predicted to contain a helix-turn-helix motif, for example residues 37-55 in <taxon tax_id="2102">Mycoplasma mycoides</taxon> p13 (<db_xref db="SWISSPROT" dbkey="O05290"/>). Genes encoding family members are often part of operons that encode components of the SRP pathway, and this protein may regulate the expression of an operon related to the SRP pathway [<cite idref="PUB00009943"/>].