genome.jp/kegg/. *Protein with changed pI in
RIF R versus RIF S isolate. Proteins belonging to the carbohydrate metabolism and the enzymes involved in the reactions of the tricarboxylic cycle (TCA) resulted up-expressed: in particular, the phosphenolpyruvate synthase [A1KSM6], the pyruvate dehydrogenase subunit E1 [A1KUG5], the glutamate dehydrogenase [A1KVB4], together with the isocitrate dehydrogenase [A1KTJ0], the succinyl-CoA synthetase subunit beta [A1KTM6] and the aconitate hydratase [A9M175]. Four proteins belonging to different metabolic pathways and those responsible for ATP production were down-expressed
in both resistant strains: the malate quinone oxidoreductase [A1KWH2], the enolase [A1KUB6], MLN2238 clinical trial the putative zinc-binding alcohol dehydrogenase [A1KSL2], the GS-4997 chemical structure carboxyphosphonoenol pyruvate phosphonomutase [A9M2G6] and the F0F1 ATP synthase subunit α [A9M121 (Table 2). A buy GSK2399872A second group of proteins is involved in the regulation of the gene expression: the elongation factor G [A1KRH0], the transcription elongation factor NusA [C9WY90], and the DNA-directed RNA polymerase subunit α [A1KRJ9] were up-expressed. On the contrary, the DNA-binding response regulator [A9M2D6], involved in the transcription, the trigger factor [A1KUE0] involved in protein export, the 60 kDa chaperonin [A1KW52], that prevents misfolding and promotes the refolding of polypeptides, and the peptidyl-prolyl cis-trans isomerase [A9M3M5], which accelerates the folding of proteins, were down-expressed.
The cell division protein [A1KVK9], the septum site-determining protein MinD [A9M3T7], the malonyl-CoA-acyl carrier protein transacylase [A1KRY7] and the putative Selleck CHIR-99021 oxidoreductase [A9M1W2], also resulted down-expressed. Four of the 23 listed proteins in the Table2 had a different pI in both the resistant strains. The difference in the pI was well visualised in the 2-DE gels. As shown in figure 1B, the isocitrate dehydrogenase (spot 5) and the putative zinc-binding alcohol dehydrogenase (spot 15) were shifted to a more basic pI, while the putative phosphate acetyltransferase (spot 9) and the putative oxidoreductase (spot 23) were shifted to a more acidic pI. Sequence analysis of the genes encoding the shifted proteins The four genes encoding proteins with a different pI were sequenced. In particular, NMC0426, NMC0547, NMC0575 and NMC0897 genes of the two resistant strains showed nucleotide mutations resulting in amino acid changes absent in the susceptible strain.