The role of the sRNA GcvB in Pasteurella multocida protein production

In this study, transcriptomic analysis of the P. multocida strain VP161 revealed a putative sRNA with high identity to GcvB from Escherichia coli and Salmonella enterica serovar Typhimurium. High-throughput quantitative liquid proteomics was used to compare the proteomes of the P. multocida VP161 wild-type strain, a gcvB mutant and a GcvB overexpression strain. These analyses identified 47 proteins that displayed significant differential production after inactivation of gcvB, 37 of which showed increased production. Thus, GcvB predominantly acts to negatively regulate protein production in P. multocida. Of the 37 proteins that were repressed by GcvB, 27 were predicted to be involved in amino acid biosynthesis or transport. Bioinformatic analyses of putative P. multocida GcvB target mRNAs identified a strongly conserved 10 nucleotide consensus sequence, 5’‑AACACAACAT-3’, with the central eight nucleotides identical to the seed binding region present within GcvB mRNA targets in E. coli and S. Typhimurium.