Phosphorylates the DNA-binding protein Rv2175c. May be involved in the regulation of cell division and cell envelope biosynthesis. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Autophosphorylated. Thr-173 is required for autophosphorylation and transphosphorylation activities. Thr-175 is not necessary for autophosphorylation activity, but is required for full kinase activity. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family.