Regulons of five ECF sigma factors were identified by microarray, proteomics and/or lacZ reporters; each controls the production of an outer membrane TonB-dependent transducer.
"the ECF sigmas PA0149, PA1912, PA2050, PA2093 and PA4896 have been overexpressed and their target gene candidates have been identified using DNA microarray, proteomic analysis, and/or lacZ reporter construct"