The MCR-1 protein may catalyze the addition of a phosphoethanolamine moiety to lipid A, which is associated with polymyxin resistance. This modification observed in E. coli expressing MCR-1 increased the minimum inhibitory concentration (MIC) of colistin and polymyxin B. MCR-1 protein, E.coli (364a.a, His-SUMO) is the recombinant E. coli-derived MCR-1 protein, expressed by E. coli , with N-His, N-SUMO labeled tag.
