https://www.selleckchem.com/products/Odanacatib-(MK0822).html s partially auxotroph for methionine and more sensitive to folate pathway inhibitors (SCP, PAS, SMX and TMP). The studies reveal that MTHFR1 and MTHFR2 are novel MTHFRs involved in de novo methionine biosynthesis and required for antifolate resistance in mycobacteria. Copyright © 2020 American Society for Microbiology.Listeria monocytogenes is a model facultative intracellular pathogen. Tight regulation of virulence proteins is essential for a successful infection, and the gene encoding the annotated thioredoxin YjbH was identified in two forward genetic screens as required for virulence factor production. Accordingly, an L. monocytogenes strain lacking yjbH is attenuated in a murine model of infection. However, the function of YjbH in L. monocytogenes has not been investigated. Here, we provide evidence that L. monocytogenes YjbH is involved in the nitrosative stress response, likely through its interaction with the redox-responsive transcriptional regulator SpxA1. YjbH physically interacted with SpxA1 and our data support a model in which YjbH is a protease adaptor that regulates SpxA1 protein abundance. Whole-cell proteomics identified eight additional proteins whose abundance was altered by YjbH and we demonstrated that YjbH physically interacted with each in bacterial two-hybrid assays. Thioredoxin proteins canonicallteins with which YjbH physically interacts, including SpxA1. Further, we demonstrated that the cysteine residues of the YjbH thioredoxin active motif are required for the nitrosative stress response, cell-to-cell spread, and some protein-protein interactions. YjbH is widely conserved among Firmicutes and this work reveals its unique requirement of the thioredoxin active motif in L. monocytogenes. Copyright © 2020 Ruhland and Reniere.Pyridoxal 5'-phosphate (PLP) is the biologically active form of vitamin B6 and an essential cofactor in all organisms. In Escherichia coli, PLP is synthesize