RNase protection of a 150-nucleotide riboprobe for
rhtA and a 100-nucleotide riboprobe for rhbA.
Lane 1, RNA from mutant 2011 rhrA26 grown under
iron-depleted conditions; lane 2, RNA from
2011::Tn5 grown under iron-depleted conditions;
lane 3, RNA from 2011::Tn5 grown under
iron-replete conditions. The Tn5 insertion in
2011::Tn5 does not affect rhizobactin 1021
regulation, biosynthesis, or transport. A 200-nucleotide riboprobe for
the npt gene of Tn5 allows comparison of RNA
levels in the reactions.