for the import of manganese. Treponema pallidum troR, a metal-dependent transcriptional repressor. Archaeoglobus fulgidus MDR1 (troR), a metal-dependent transcriptional repressor, which negatively regulates its own transcription . [ edit ] References ^ Guedon E, Helmann JD (April 2003). "Origins of metal ion selectivity in the DtxR/MntR family of metalloregulators". Mol. Microbiol.