Rhomboid-type serine protease that catalyzes intramembrane proteolysis. May be involved in TIC22 processing during its import. Homooligomer. No visible phenotype. Rbl10 and rbl11 double mutants have no visible phenotype. Belongs to the peptidase S54 family. Both termini are shown to be facing the stroma and hence a sixth transmembrane domain should be present.