Front Cell Infect Microbiol. 2015 Dec 8;5:91. doi: 10.3389/fcimb.2015.00091. eCollection 2015.

The Regulation of the AdcR Regulon in Streptococcus pneumoniae Depends Both on Zn(2+)- and Ni(2+)-Availability.

Manzoor I1, Shafeeq S2, Afzal M1, Kuipers OP3.

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By using a transcriptomic approach, we have elucidated the effect of Ni(2+) on the global gene expression of S. pneumoniae D39 by identifying several differentially expressed genes/operons in the presence of a high extracellular concentration of Ni(2+). The genes belonging to the AdcR regulon (adcRCBA, adcAII-phtD, phtA, phtB, and phtE) and the PsaR regulon (pcpA, prtA, and psaBCA) were highly upregulated in the presence of Ni(2+). We have further studied the role of Ni(2+) in the regulation of the AdcR regulon by using ICP-MS analysis, electrophoretic mobility shift assays and transcriptional lacZ-reporter studies, and demonstrate that Ni(2+) is directly involved in the derepression of the AdcR regulon via the Zn(2+)-dependent repressor AdcR, and has an opposite effect on the expression of the AdcR regulon compared to Zn(2+).


AdcR; AdcR regulon; Pht family proteins; PsaR regulon; metal homeostasis; nickel; pneumococcus; zinc

PMID: 26697415 [PubMed - in process] PMCID: PMC4672087