GSM5090459: S. mutans UA159 grown in FMC to OD600 = 0.4, then exposed to 4mM ZnSO4 for 15 minutes  Replicate 2; Streptococcus mutans UA159; RNA-Seq
Harvested cells were resuspended in 1mL of RNA Protect Bacteria Reagent (Qiagen). Total RNA was isolated from homogenized S. mutans cell lysates by acid-phenol:chloroform extractions.  The nucleic acid was subjected to DNase I digestion (Ambion).   The RNA was then purified using the Qiagen RNeasy colum purification kit, including an additional on-column DNase digest.  Total RNA was subjected to two rounds of mRNA enrichment using the MICROBExpress Bacterial mRNA Purification kit (ThermoFisher). cDNA libraries with unique barcodes were generated from 100ng enriched mRNA using the NEB Next UltraII Directional RNA Library Prep kit for Illumina (New England Biolabs). Pooled libraries were subjected to RNA deep sequencing at the University of Florida Interdisciplinary Center for Biotechnology Research using the Illumina NextSeq500 platform.