Dataset: Raw LC-MS/MS and DNA

A proteomic profile of the chemolithoautotrophic, neutrophilic, iron-oxidizing Mariprofundus ferrooxydans was obtained in duplicates and analyzed via LC-MS/MS. Additionally, a proteomic analysis of the membrane fraction is included. Cultures were harvested at late log phase by following the protocol in Barco and Edwards (2014). Briefly, proteins were extracted with 0.1N NaOH/2% SDS solution, clarified and concentrated by nanofiltration. The concentrated samples were run on SDS-PAGE gels in duplicate lanes. All the bands from each lane were excised and analyzed via LC-MS/MS. Membrane fractions were obtained in the following way: the cell-separation protocol was performed per Barco and Edwards (2014) and the cell pellet was resuspended in 0.5M NaCl/40mM Tri-base buffer at pH 8.5 and sonicated for 10 cycles of 30 secs pulses followed by 30 secs of cooling. This sample was clarified and the supernatant was ultracentrifuged at 100,000 x g for 2 hrs. The reddish pellet was solubilized with 0.5% Ultrol Grade, n-Dodecyl-beta-D-maltoside and run on a SDS-PAGE gel. DNA: DNA was extracted by using the FastDNA Spin soil kit according to the manufacturer’s instructions (MP Biomedicals). Extracted DNAwas stored at 20 degrees C until processing. Genomic gaps were amplified by PCR on a Veriti thermal cycler (Life Technologies) as follows: 1 step of denaturation at 95 degrees C for 4 min; 35 cycles of denaturation, melting, and extension (95 degrees C for 30 s, 51 degrees C for 30 s, and 72 degrees C for 3 min, respectively); 1 step of extension at 72 degrees C for 10 min; and 1 final step of cooling at 4 degrees C. Primers used for the gap containing the Cyc1PV-1 gene were 79F (5'-GAAGCGATGGGAAATGTGAAT-3') and 375F (5'-CACACTGGAAGATGTTCTGG-3'). Primers used for the gap containing the Cyc2PV-1 gene were 555F (5'-ACTGATGGGTATCAACAACC-3') and 92R (5'-CCTATCTGTACCGAGCATTC-3'). The amplicons were purified by using the QIAquick PCR purification kit (Qiagen). Amplicon sizes were checked in a 1% agarose gel via electrophoresis. Purified PCR amplicons were submitted for Sanger sequencing and primer walking (Laragen).