HTH-type transcriptional regulator MntR - P54512 (MNTR_BACSU)


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  • Number of PDB entries for P54512: 18
Central regulator of manganese homeostasis that regulates the expression of both manganese uptake and efflux systems (PubMed:27748968, PubMed:10760146, PubMed:12950915). In the presence of high levels of manganese, it mediates repression of the manganese uptake systems MntH and MntABCD and activation of the efflux systems MneP and MneS. Binds with high affinity to the regulatory regions of its target genes (PubMed:27748968, PubMed:12950915). The manganese concentration required for activation of efflux is higher than that for repression of uptake (PubMed:27748968). UniProt
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Subunit Structure
Homodimer. UniProt
Contains an N-terminal DNA-binding domain and a C-terminal dimerization domain (PubMed:12847518, PubMed:16533030, PubMed:23298157). Contains two metal binding sites per subunit, site A (corresponding to metal ion 2) and site C (corresponding to metal ion 1), which both contribute to the metal selectivity of MntR. A large metal cation is needed at the A site to correctly orient and position the C site ligands. Smaller, non-cognate metal cations bind at the A site, but disrupt the C site, blocking the full activation of MntR. Binding at the C site also favors Mn(2+) and Cd(2+) over other metals (PubMed:16533030, PubMed:23298157). UniProt
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