The Bradyrhizobium japonicum rpoH1 gene encoding a sigma32-like protein is part of a unique heat shock gene cluster together with groESL1 and three small heat shock genes

The heat shock response in Bradyrhizobium japonicum is mediated by the numerous regulatory factors. The amino acid sequence of the RpoH genes of the microbe is similar to proteobacteria proteins that belong to the alpha subgroup. The rpoH gene is clustered with five additional heat shock genes that is responsible for allowing the heat shock induction of groESL which has a highly conserved inverted-repeat structure. A conserved sequence was also detected between the transcriptional and first translational start sites of the rpoH gene.