RT Journal Article SR Electronic(1) A1 Borsetti, Francesca A1 Dal Piaz, Fabrizio A1 D’Alessio, Federico A1 Stefan, Alessandra A1 Brandimarti, Renato A1 Sarkar, Anindita A1 Datta, Ankona A1 Montón Silva, Alejandro A1 den Blaauwen, Tanneke A1 Alberto, Mucchi A1 Spisni, Enzo A1 Hochkoeppler, AlejandroYR 2018 T1 Manganese is a Deinococcus radiodurans growth limiting factor in rich culture medium JF Microbiology, VO 164 IS 10 SP 1266 OP 1275 DO https://doi.org/10.1099/mic.0.000698 PB Microbiology Society, SN 1465-2080, AB To understand the effects triggered by Mn2+ on Deinococcus radiodurans, the proteome patterns associated with different growth phases were investigated. In particular, under physiological conditions we tested the growth rate and the biomass yield of D. radiodurans cultured in rich medium supplemented or not with MnCl2. The addition of 2.5–5.0 µM MnCl2 to the medium neither altered the growth rate nor the lag phase, but significantly increased the biomass yield. When higher MnCl2 concentrations were used (10–250 µM), biomass was again found to be positively affected, although we did observe a concentration-dependent lag phase increase. The in vivo concentration of Mn2+ was determined in cells grown in rich medium supplemented or not with 5 µM MnCl2. By atomic absorption spectroscopy, we estimated 0.2 and 0.75 mM Mn2+ concentrations in cells grown in control and enriched medium, respectively. We qualitatively confirmed this observation using a fluorescent turn-on sensor designed to selectively detect Mn2+ in vivo. Finally, we investigated the proteome composition of cells grown for 15 or 19 h in medium to which 5 µM MnCl2 was added, and we compared these proteomes with those of cells grown in the control medium. The presence of 5 µM MnCl2 in the culture medium was found to alter the pI of some proteins, suggesting that manganese affects post-translational modifications. Further, we observed that Mn2+ represses enzymes linked to nucleotide recycling, and triggers overexpression of proteases and enzymes linked to the metabolism of amino acids., UL https://www.microbiologyresearch.org/content/journal/micro/10.1099/mic.0.000698